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Results 4681 to 4710 of 5716:

Human resources development in rural areas of the Czech Republic

L. Svatošová

Agric. Econ. - Czech, 2008, 54(2):71-76 | DOI: 10.17221/268-AGRICECON

Regional development strategy has to be designed with knowledge of human resources' development trends. Monitoring of this factor is of concern namely in rural areas where disfavourable demographic situation may occur. Leaving this problem unsolved would constitute depopulation of certain endangered regions. The paper is focused on analysis of human resources' condition and development granding groups of settlements by size.

Information systems in the adaptation process of the Euro currency in Slovakia

M. Kučera, M. Fiľa, A. Látečková

Agric. Econ. - Czech, 2008, 54(8):352-357 | DOI: 10.17221/301-AGRICECON

On the 1st of January 2009, the Slovak Republic should implement the Euro currency and enter the European Monetary Union. The implementation of the Euro currency is in currently the most important theme in our country. Business companies will benefit most, but they will also bear most of the single-shot costs. Up to 80% of the costs are constituted by the adaptation of information systems (IS). At the end of the year 2007, only 14% of Slovak companies were prepared in the terms of the Euro adaptation in IS. This condition of the business sector is very important and also alarming. Accelerated preparations of the changes in IS are needful, but this project is highly complicated, primarily in big business organizations. The quality of the realized project and the continuous transmission of IS will be a critical point of the firm success on the Slovak and European markets.

Index of Agricultural Economics (Volume 54) Authors Index of Agricultural EconomicsIndex

editors

Agric. Econ. - Czech, 2008, 54(12):X1 | DOI: 10.17221/288-AGRICECON

Biological activity, nitrogen dynamics, and chemical characteristics of forest soils in the Šumava national park

M. Svoboda

J. For. Sci., 2003, 49(7):302-312 | DOI: 10.17221/4704-JFS

This paper deals with large-scale mountain forest decline in the Šumava National Park. The changes in biotic and abiotic properties of forest sites follow the tree layer disintegration. Changed microclimatic conditions such as intensity of irradiance, moisture and temperature of the top holorganic layers together with altered development of ground vegetation could strongly affect the values of microbiological respiration activity and the rates of nitrogen mineralization and nitrification. Soil substrates, built of organic mater, located on stony locations, are endangered by introskeletal erosion. This paper compares these features in pairs of research plots, consisting of dead or cut forest and of living stand. According to the results of this study, higher rates of organic matter decomposition, transformed dynamics of nitrogen and other nutrients and possible nutrient leaching from soil solutions were demonstrated in the forest floor under declined spruce stands. The extent and seriousness of these adverse processes for forest soils are strongly site dependent.

Seroprevalence of Aspergillus fumigatus antibodies in bovine herds with a history of reproductive disorders

M.E. Garcia, J. Caballero, S. Alvarez-Perez, J.L. Blanco

Vet Med - Czech, 2008, 53(3):117-123 | DOI: 10.17221/1939-VETMED

Bovine reproductive disorders are of growing interest from both economic and health standpoints. The role that fungi play in these processes is becoming increasingly important. Study of the seroprevalence of anti-Aspergillus antibodies in cow sera taken from herds with previous reproductive disorders is therefore of great interest. We used an indirect ELISA technique, that had shown suitable results in previous studies in other animal species. Thirteen percent of the 387 animals tested in the current study were positive, accounting for 41% of herds. When this technique was applied to the sera of two fetuses, that were aborted due to aspergillosis, a significant difference in anti-Aspergillus antibody levels was found compared with those in control sera. The ELISA technique was compared with PLATELIA and PCR for 24 ELISA-positive cattle sera; these assays resulted in only one and three positive results, respectively. In conclusion, the ELISA analysis showed a significant seroprevalence of Aspergillus antibodies in herds with previous reproductive disorders. There is therefore a need for more attention to be paid to Aspergillus in the differential diagnoses of these conditions and to improve preventive methods to effectively control this organism.

Response of the Norway spruce (Picea abies [L.] Karst.) root system to changing humidity and temperature conditions of the site

O. Mauer, R. Bagár, E. Palátová

J. For. Sci., 2008, 54(6):245-254 | DOI: 10.17221/14/2008-JFS

The Bohemian-Moravian Upland shows a large-scale decline and dieback of Norway spruce up to the forest altitudinal vegetation zone (FAVZ) 5. This phenomenon has been observed in the last 7 years and its progress is rapid. Healthy, declining and standing dry trees of equal height were mutually compared in nine forest stands (aged 3-73 years). These parameters were measured: increment dynamics, root system architecture, biomass, fine root vitality and mycorrhiza, infestation by biotic and abiotic agents. Analyses were done for 414 trees, soil characteristics and weather course data covered the period 1961-2004. Warming and precipitation deficit are the predisposition factors. Weakened trees are aggressively infested by the honey fungus (Armillaria mellea), and they die from root rots. In this paper we describe the mechanism of damage to and dieback of the spruce trees concerned.

Effect of ethanol on interactions of bitter and sweet tastes in aqueous solutions

Zdeňka PANOVSKÁ, Alena ŠEDIVÁ, Markéta JEDELSKÁ, Jan POKORNÝ

Czech J. Food Sci., 2008, 26(2):139-145 | DOI: 10.17221/2466-CJFS

Experimental samples simulated the composition of vermouths. In all experiments, 0.01% quinine was used as a standard bitter substance. Sucrose increased the acceptability in the concentration range of up to 14%, remaining constant at higher concentrations, both in aqueous and 16% ethanolic solutions. A decrease of bitterness was observed in water but not in 16% ethanol. Ethanol did not affect the sweetness appreciably at the concentrations of up to 16%, but 32% ethanolic solutions appeared less sweet. Ethanol enhanced the bitterness only at high concentrations; interactions were similar in the samples containing 10% and 16% sucrose. Aspartame and Neotame sweetness increased the acceptability and decreased the bitterness similarly to sucrose, both in aqueous and in 16% ethanolic solutions.

Growth and health state of silver fir (Abies alba Mill.) in the ridge area of the Jizerské hory Mts.

V. Balcar, D. Kacálek

J. For. Sci., 2008, 54(11):509-518 | DOI: 10.17221/63/2008-JFS

The silver fir was planted under mountain conditions in order to reveal its response to the addition of finely ground rocks (limestone and amphibolite) mixed with soil into the planting holes. The results document that the increments of the plantations fertilised with amphibolite were higher by 25% on average than those of the control plantations while the increments of the plantations treated with dolomitic limestone were lower by 13%. Generally, as concerns both the plantations with the application of ground rocks and the control ones, the development of the fir plantations in 1994-2007 is considered successful. As the damage by climatic stresses has gradually diminished, the number of dead trees has been decreasing and the height increments have been increasing in the last years, therefore a positive development is to be expected also in future.

Identification of organic acids produced during rice straw decomposition and their role in rock phosphate solubilization

A. Kumari, K.K. Kapoor, B.S. Kundu, R.K. Mehta

Plant Soil Environ., 2008, 54(2):72-77 | DOI: 10.17221/2783-PSE

The production of organic acids and changes during decomposition of rice straw amended with tricalcium phosphate (TCP) and Udaipur rock phosphate (URP) were studied under laboratory conditions. The organic C content of rice straw decreased and total N increased with time, resulting in a decrease in C:N ratio as the decomposition progressed. The pH decreased to acidic range in all the treatments on day 15, but became alkaline again later on. Soluble P increased at 15 days after incubation, declined later during decomposition, and was highest in the treatments containing TCP and Aspergillus awamori inoculation. Citric, oxalic, formic and maleic acids were detected during decomposition of rice straw and maximum amounts were present on day 15. Citric and oxalic acids were responsible mainly for P solubilization from TCP and URP; generally, citric acid was the most effective in P solubilization.

Prof. Ing. ANTONIN KOVÁČIK, DrSc.Obituary Notice

I. Bareš

Czech J. Genet. Plant Breed., 2008, 44(3):119-120 | DOI: 10.17221/54/2008-CJGPB

Electron microscopy of structures present in embryonic cells of plants infected with Plum pox virus

Jaroslav Polák, Milan Jokeš, Miloslava Ducháčová, Alena Hauptmanová, Petr Komínek

Plant Protect. Sci., 2008, 44(3):81-84 | DOI: 10.17221/28/2008-PPS

Electron microscopy was used to detect the presence of virus particles or inclusions in growth tips and parenchymatic cells of leaves of plum, apricot and peach trees artificially infected with Plum pox virus (PPV). Typical pinwheels were found in ultrathin sections of leaves of PPV infected plums, apricots and peaches. Filamentous particles or their aggregates approximately 750 nm long were found in ultrathin sections of growth tips of plum, apricot, and peach shoots with a diameter of 0.5 mm. Pinwheels were never present in embryonic cells. No virus particles were found in ultrathin sections of growth tips of PPV infected plum, apricot and peach shoots of 0.2 mm in diameter. Embryonic cells of growth tips up to 0.2 mm in diameter are PPV free. PPV particles are present in growth tips at a distance 0.2-0.5 mm from the top; the virus is probably multiplied in this part of the growth tips.

Effects of genistein and genistin on in vitro maturation of pig oocytes

Z. Vodková, R. Rajmon, J. Petr, P. Klabanová, F. Jílek

Czech J. Anim. Sci., 2008, 53(1):1-8 | DOI: 10.17221/2718-CJAS

The objective of the study was to verify the hypothesis that GEN (genistein - phytoestrogen and an inhibitor of tyrosine protein kinase - TPK) effects on pig oocyte maturation and cumular cell expansion under in vitro conditions are connected with its estrogenic activity. Oocytes were cultivated for 24 hours up to the stage of the first meiotic metaphase (MI). Three different doses of GEN (13, 40, 80 µg/ml of medium) and also three doses of GIN, genistin, an analogue of GEN without effects on TPK, (80, 160 and 240 µg/ml of medium) were tested. To verify the reversibility of GEN effects, the oocytes were first cultivated for 24 hours with 80 µg of GEN per 1 ml of medium and then for another 24 hours without any GEN. GEN blocked pig oocyte maturation at the stage of the germinal vesicle (GV), depending on the dose. After rinsing out the GEN the oocyte maturation recovered, but with abnormalities (32%). GIN in a concentration of 80 µg/ml of medium induced a significant blockage at the GV stage (18%). With an increase in the GIN concentration, the number of oocytes blocked at the GV stage significantly decreased, but the abnormal maturation increased (up to 31%). GEN inhibited the cumular cell expansion in proportion to its dose. GIN had a less pronounced effect. As GEN and GIN effects demonstrate similar patterns, it is probable that estrogenic activity is involved.

The evaluation of growth and selected carcass and meat quality parameters in fattening bulls fed a diet based on concentrates or maize silage

E. Štercová, A. Krása, R. Lepková, J. Šterc

Czech J. Anim. Sci., 2008, 53(9):368-376 | DOI: 10.17221/334-CJAS

The aim of the study was to evaluate the growth rate and selected carcass and meat quality parameters in bulls fed a high-grain diet and to compare the results with those obtained in bulls fed a diet based on preserved roughage. The trial included 18 Czech-Pied bulls fed a diet with a high proportion of concentrated feed and 18 Czech-Pied bulls fed a diet based on maize silage, used as a control group. The trial was launched after the weaning of calves. During the fattening period, live weight and average daily weight gain were monitored. The bulls were slaughtered at the live weight of 550-600 kg, the mean age at slaughter was 473 days for the high-grain diet group and 474 days for the control group. The carcasses were classified to SEUROP quality grades, and carcass gain and dressing percentage were calculated. Samples of m. longissimus pars thoracis were taken from five bulls in each group to examine selected meat quality parameters. In the period from weaning to slaughter the high-grain diet bulls and the control bulls achieved the average daily weight gain of 1.29 kg and 1.21 kg, respectively. Differences between the groups were not significant. The high-grain diet group showed higher average carcass weight and higher carcass weight gain, differences between the groups were not significant, either. As to meat quality parameters under study, a significant difference was found only in meat lightness (L*), with the mean value in the high-grain diet group being significantly (P ≤ 0.01) lower than in the control group. The other meat quality parameters did not show any significant differences between the groups. In this study, the high-grain diet gave similar performance as the maize silage-based diet in fattening bulls. The high-grain diet group and control group showed comparable average daily weight gain and selected carcass and meat quality parameters.

Cultivar and rootstock response to drip irrigation in sweet cherry tree vigour and start of bearing during the first three years after planting

J. Blažková, I. Hlušičková

Hort. Sci. (Prague), 2008, 35(2):72-82 | DOI: 10.17221/641-HORTSCI

Fifteen sweet cherry cultivars and three rootstocks were evaluated within three years in two experimental orchards established in the same location in the autumn 2004. In one of them drip irrigation was applied in the periods of insufficient rainfall, i.e. from mid-April to mid-August. This irrigation distinctly increased the vigour of trees that was jointly expressed by trunk-cross-section area, total length of shoots and canopy volume. An increase of tree vigour was the greatest in trees on Mazzard, medium on P-HL-C and the lowest on Gisela 5 rootstocks. The trees on P-HL-C that grew without irrigation similarly as the trees on Gisela 5 grew significantly more vigorously when irrigation was applied. Considerable differences in the response to irrigation were also found among cultivars; it increased the vigour of Halka, Sylvana, Aranka and Burlat more distinctly, whereas the least response to irrigation was recorded in the Horka, Jacinta and Justyna cultivars. The vigour of Regina, Tim and Vanda cultivars grown on P-HL-C rootstock was more extensively increased by irrigation than if they grew on Gisela 5. Flower and fruit sets of irrigated trees were with a few exceptions significantly lower than those of trees without irrigation. Tamara, Sandra and Regina were the most vigorous cultivars in this study, whereas Tim and Skeena had the weakest tree growth. Practical aspects of these findings are briefly discussed.

Food industry in the Czech Republic - with regard to labour force development

M. Putićová, J. Mezera

Agric. Econ. - Czech, 2008, 54(6):286-292 | DOI: 10.17221/282-AGRICECON

The submitted paper analyses the development of food industry in the Czech Republic in 2000-2006, its position (in 2006) and development trends of main economic indicators compared to the development of manufacturing industry. In comparison with the dynamic development of Czech manufacturing industry, key position of food industry has decreased. The monitored food sector has heterogeneous structure with regard to branches. In connection with these differences, development trends of separate branches are fluctuating but labour productivity of the food sector as a total has markedly accelerated.

Knowledge maps in agriculture and rural development

H. Brožová, T. Šubrt, J. Bartoška

Agric. Econ. - Czech, 2008, 54(11):546-552 | DOI: 10.17221/263-AGRICECON

The possibility of knowledge maps use in the decision-making process in agriculture and rural development is discussed in this paper. Each knowledge map presents a visualization of knowledge using different tools, where a mathematical model can be applied as one of them. The hierarchical structure of a knowledge map conforms to the general structure of a mathematical model. The mathematical model, when successfully solved and correctly read, is a knowledge map in itself. The parallels exist also between the creation process of a mathematical model and of a knowledge map. In general, every phase of a system approach can lead to a special knowledge map. The following paper explains this process and demonstrates it on the farm production structure optimisation problem solved by using a linear programming model.

Sorption and thermal properties of rice, potato starch, and oat flakes

Aleš LANDFELD, Milan HOUŠKA, Karel HOKE

Czech J. Food Sci., 2008, 26(6):413-420 | DOI: 10.17221/1363-CJFS

A precise design of the equipment for thermal sterilisation of rice, potato starch, and oat flakes by dry heat requires the knowledge of the relevant values of physical properties of these products. Water activity and enthalpy are presented as functions of temperature and humidity. Water activity was measured as a function of the moisture content and temperature in the desorption process that reproduces the real conditions existing during dry heat processing in the pilot rotating steriliser equipment. The heat of evaporation can be predicted from these data as a function of the moisture content of these products. DSC (differential scanning calorimetry) method was used for measuring the enthalpy of these products as a function of temperature during desorption of moist products starting from various levels of the moisture content. The total energy Ec necessary for heating the product and evaporation of the given amount of water can be calculated.

Cohabitation and intraleaf distribution of phytoseiid mites (Acari: Phytoseiidae) on leaves of Corylus avellana

Jan KABÍČEK

Plant Protect. Sci., 2008, 44(1):32-36 | DOI: 10.17221/3/2008-PPS

Leaves from uncultivated and unsprayed hazelnut shrubs, Corylus avellana, were sampled from June to August 2005 to obtain information on the phytoseiid mite taxocenoses, population density and intraleaf distribution. Six phytoseiid mite species were identified, of which three, Kampimodromus aberrans, Euseius finlandicus and Neoseiulella tiliarum, were more abundant. The eudominant, slowly moving K. aberrans was found on all leaf samples. Phytoseiid population density averaged 3.16 mites per hazelnut leaf. While on most leaves only one phytoseiid species was found, on some there was cohabitation of two (rarely three) species. The three frequent species mostly inhabited the sheltered microhabitat at the veins of leaves of C. avellana.

Integration of soil information systems. BIS and SOTER perspectivesReview

Jitka Sládková

Soil & Water Res., 2008, 3(4):183-198 | DOI: 10.17221/2090-SWR

The article presents an overview and brief characteristics of the selected soil information systems in the Czech Republic. It suggests synchronisation of their development, particularly some convergence of the Land Evaluation Information System and Soil and Terrain Digital Database. In the pilot area of Litoměřice district, it demonstrates the application of the SOTER methodology for the construction of middle- and detail-scale soil maps, using the data from the General survey of agricultural soils. It not only shows the variety of the district soil conditions, but it also supplements them with the data gathered in the 2006 soil survey.

Czech agriculture after the accession to the European Union - impacts on the development of its multifunctionality

T. Doucha, I. Foltýn

Agric. Econ. - Czech, 2008, 54(4):150-157 | DOI: 10.17221/291-AGRICECON

The article presents the evaluation of multifunctionality of Czech agriculture and its individual farm categories in the period of 2003-2005. It compares the situation before and after the EU accession. The assessment is based on the set of indicators for the three elementary axes of multifunctionality: economic efficiency, relations to environment and relations to rural development. Applying the presented method of multi-criterion evaluation and during the period of 2003-2005 on average, the highest level of multifunctionality is found in the category of farms of physical persons with 101-300 ha (score 174) and the lowest level in the category of collective farms - cooperatives and joint stock companies (score about 115). However, compared with the pre-accession period, the collective farms show the highest growth of the score (by 17%) after the EU accession.

Identification of heterosomes in spermatoza of rams with 54,XX/54,XY chimerism

A. Kozubska-Sobocinska, B. Rejduch

Vet Med - Czech, 2008, 53(5):250-254 | DOI: 10.17221/1855-VETMED

The aim of the study was to identify heterosomes in the semen of three Romanov rams - carriers of leukocyte chimerism (FISH technique) and to determine the proportions between spermatozoa with X and Y chromosomes. The choice of bovine probes for hybridization with ram heterosomes was dictated by genetic conservatism of bovine and ovine heterosomes. The ratio between spermatozoa with a yellow fluorescent signal containing the X chromosome in the haploid set and spermatozoa with a red-purple signal indicating the presence of the Y chromosome, taking into account spermatozoa with no signal, was 52%:43%:5% in ram No. PL100006077676; 47%:44%:9% in ram No. PL100006078031; and 48%:46%:6% in ram No. PL100006078895. The results obtained lead us to conclude that the 54,XX/54,XY chimerism has no effect on sex ratio in offspring.

Botulism in horses: a case report

P. Jahn, E. Ludvikova, D. Chmelar, L. Kalova

Vet Med - Czech, 2008, 53(12):680-684 | DOI: 10.17221/1971-VETMED

Two cases of botulism in horses are described in the article. In the first case two horses died, one survived and recovered after four weeks. Botulotoxin type B was detected using a mouse bioassay in the gastrointestinal content of both dead horses; Clostridium botulinum bacteria were cultivated from one of them. In the second case two horses were affected. One of them was euthanized because of persistent recumbency, the second one recovered after six weeks. Detection of botulotoxin in the serum of the dead horse using the mouse bioassay was not successful.

Forest transport roads according to natural forest regions in the Czech Republic

J. Žáček, P. Klč

J. For. Sci., 2008, 54(2):73-83 | DOI: 10.17221/799-JFS

Important parts of the forest sector are forest engineering constructions and capital construction of forest road network which improve the optimal management of forests and forest stands and their reasonable opening by a forest road network. The basic frameworks of forest road network are forest transport roads of various grades and categories. The paper discusses the basic parameters of forest transport roads such as the length of forest transport roads and their density outspread to the area of a particular district above all. The conditions of forest opening in 41 Natural Forest Regions of the Czech Republic and in the Czech Republic as a whole are shown and confronted on the basis of these parameters. A dilemma of the double division of forest transport roads according to the standard ČSN 73 6108 - Lesní dopravní síť (Forest Transportation Network) and according to the methodology used by Forest Management Institute in Brandýs nad Labem is also described in the paper. Although it is not suitable to use two methods of evaluation, there is no tendency to unify it.

Comparison of general tree characteristics of less known oak species Quercus dalechampii Ten. and Quercus polycarpa Schur

R. Matula

J. For. Sci., 2008, 54(8):333-339 | DOI: 10.17221/3096-JFS

This study was designed to evaluate basic tree characteristics of Quercus dalechampii Ten. and Quercus polycarpa Schur and to find out differences between them. Total height, height of crown base and diameter at breast height were measured before tree felling. Cut stems were visually checked for heart rot on their basal parts. Diameters were measured on each stem in 1 meter long sections from the base to the point of life crown setting. Average values for both species were compared by t-test. The total height was proved to be statistically different; the height of crown base and diameter at breast height were quite similar for both species. Q. dalechampii Ten. was proved to be of larger stem diameter from the tree foot to the 3rd height meter; the diameter of Q. polycarpa Schur was superior from that height upwards. However, the most significant interspecies difference was found in a number of stems affected by wood-rot fungi as Q. polycarpa Schur turned out to be less resistant than Q. dalechampii Ten.

The effect of different rates and forms of sulphur applied on changes of soil agrochemical properties

M. Skwierawska, L. Zawartka, B. Zawadzki

Plant Soil Environ., 2008, 54(4):171-177 | DOI: 10.17221/391-PSE

A three-year field experiment was conducted from 2000 to 2002 in North-East Poland. Each year three sulphur fertilization rates in the form of sulphate (S-SO2-4) and pure (S-S0) sulphur were applied: 40, 80 and 120 kg/ha. In the soil horizon at the depth of 0-40 cm the triple rate of S- and S-S0) depressed soil reaction. Acidification of soil caused by S-SO2-4 became evident already in the first year of the study while that resulting from S-S0) application appeared as late as in the third year. The effect of sulphur on soil in the 40-80 cm horizon was irregular. As the sulphur rates increased and the duration of the experiment progressed, sulphates accumulated in soil. In the 0-40 cm soil layer, the increasing rates of sulphur tended to increase the content of N-NH+4. In most objects, the NPK + S fertilization, and especially the single S-SO2-4 treatment, caused an increase in N-NO-3 in both soil layers compared with the NPK fertilized object. The dose of 120 kg/ha S-SO2-4 caused a significant increase in the concentration of available phosphorus in soil in the 0-40 and 40-80 cm layers.

Growth and yield of safflower genotypes grown under irrigated and non-irrigated conditions in a highland environment

E. Öztürk, H. Özer, T. Polat

Plant Soil Environ., 2008, 54(10):453-460 | DOI: 10.17221/403-PSE

Producers in highland and semiarid regions have difficulty in increasing diversity in crop rotations due to unfavorable conditions imposed by cool temperatures, inadequate rainfall, and shorter growing periods. In such conditions, safflower appears as a promising alternative because it is cold and drought tolerant. The objective of this study was to determine the responses of the hybrid and open-pollinated safflower genotypes to irrigated and non-irrigated conditions in a highland environment. For this reason, the field research was performed during the years of 2001 and 2002 in eastern Anatolia, Turkey. According to the results of the study, safflower genotypes tested were well adapted to the cool and short-season conditions in this region. The response of seed yield to genotype varied depending on the growing seasons. The non-irrigated plants produced nearly the same seed yield as irrigated ones. Average seed yields of safflower genotypes tested were 914.3 and 928.0 kg/ha in 2001, and 1143.6 and 1139.9 kg/ha in 2002 years for irrigated and non-irrigated experiments, respectively. In general, the genotypes differed in all of the investigated traits. In both irrigated and non-irrigated experiments genotype × year interactions were very significant for all parameters. This research shows that in semiarid and highland environments safflower has a big potential value as an oilseed crop under dryland conditions.

Amino acid contents and intestinal digestibility of lucerne in ruminants as influenced by growth stage

P. Homolka, V. Koukolová, Z. Němec, Z. Mudřík, B. Hučko, J. Sales

Czech J. Anim. Sci., 2008, 53(12):499-505 | DOI: 10.17221/367-CJAS

Lucerne (Medicago sativa L. var. Palava), harvested at four successive dates over a 30-day period, was evaluated for chemical composition (dry matter, organic matter, crude protein, ether extract, crude fibre, nitrogen-free extract, neutral detergent fibre, acid detergent fibre, acid detergent lignin), amino acid contents and intestinal digestibility in dairy cows. Dry matter (r = 0.78), organic matter (r = 0.95), crude fibre (r = 0.91), neutral detergent fibre (r = 0.94), acid detergent fibre (r = 0.79) and acid detergent lignin (r = 0.48) presented positive linear correlation coefficients (r) with growth stage, whereas crude protein (r = -0.96), ether extract (r = -0.86) and nitrogen-free extract (r = -0.70) showed negative relationships. Total essential amino acid content decreased (r = -0.94) from 84.1 to 55.3 g/kg of dry matter with maturity, with r-values higher than -0.90 obtained between growth stage and contents of lysine, methionine, threonine and valine. With the exception of tyrosine (r = -0.68), r-values between growth stage and individual non-essential amino acids were all higher than -0.90. Total amino acid (r = -0.98) and nitrogen (r = -0.99) contents presented comparable tendencies with successive sampling times. Whereas no definite trends were detected for the amino acid composition of rumen incubated (16 hours) lucerne samples, the intestinal digestibility of total essential (r = -0.78), total non-essential (r = -0.58) and total (r = -0.69) amino acids as well as nitrogen (r = -0.99) decreased with growth. However, due to a small sample size (n = 4), most linear relationships between constituents and growth stage were insignificant. It can be concluded that, although limited in the sample size, this report presents information on the decrease in amino acid contents and intestinal amino acid digestibility as growth proceeds in lucerne (var. Palava) produced in the Czech Republic, which could be utilized in the feeding of ruminants.

Entrepreneurship in small and medium-sized enterprises: Comparative study between Slovakia and Poland for the years 2001-2007

I. Ubrežiová, K. Wach, J. Horváthová

Agric. Econ. - Czech, 2008, 54(8):358-366 | DOI: 10.17221/299-AGRICECON

The main attention of the submitted paper is devoted to the comparison of development of entrepreneurship in Slovak and Polish small and medium-sized he enterprise sector. The conditions for blooming entrepreneurship are created in the national economy. Especially the role of SMEs in the transition economy, both in Slovakia and Poland, has the impact on SMEs. The entrepreneurship of small and medium-sized enterprises is extended in the whole Slovakia. From the viewpoint of the regional structure, most enterprises are located in the Bratislavský region (30.4%), Košický region (11.8%), Žilinský region (10.1%) and Trenčianský region (10.1%). On the other hand, the least of enterprises were registered in the Nitrianský region (8.9%), Trnavský region (9.2%) and Banskobystrický region (9.6%). Small and medium entrepreneurship is diversed throughout Poland. The average small and medium entreprenership ratio is 44.5, while the highest is in the Mazowieckie region - 55.2% and the lowest in the Podkarpackie region - 30 %. The supporting system for private entrepreneurship in both countries, Slovakia and Poland, is very similar and the entrepreneurs are satisfied with its offer and help.

Bacterial D-alanine concentrations as a marker of bacterial nitrogen in the gastrointestinal tract of pigs and cows

U. Schoenhusen, J. Voigt, U. Hennig, S. Kuhla, R. Zitnan, W.-B. Souffrant

Vet Med - Czech, 2008, 53(4):184-192 | DOI: 10.17221/1922-VETMED

D-alanine (DAL) has been successfully used as a marker of bacterial nitrogen (N) in the small intestine of cows. This study compares DAL contents of intestinal bacteria in digesta of cows and pigs with respect to diet and sampling site. In isolated ileal bacteria of pigs a DAL/N ratio (41.72 ± 3.19 mg/g, n = 18) was found, which was not different from that in rumen bacteria (40.11 ± 1.95 mg/g, n = 18) but higher than in duodenal bacteria of cows (38.09 ± 2.09 mg/g, n = 18, P < 0.001). The DAL/N ratio in ileal bacteria of pigs was independent of the diet (P = 0.38) but it tended to be affected by the animal (P = 0.095). In bacterial preparations derived from cows, the DAL/N ratio depended on the diet (P = 0.04) and the site of sampling (P = 0.004). Our findings indicate that a general value for DAL/N ratio in pig or cow intestinal contents to calculate bacterial N should not be used.

Current and emerging assays for Francisella tularensis detection: a review

M. Pohanka, M. Hubalek, V. Neubauerova, A. Macela, M. Faldyna, H. Bandouchova, J. Pikula

Vet Med - Czech, 2008, 53(11):585-594 | DOI: 10.17221/1862-VETMED

This paper presents an overview of methods for detection and identification of the pathogenic bacterium Francisella tularensis such as cultivation tests, enzyme-linked immunosorbent assays, flow cytometry, polymerase chain reaction, immunosensor, microarray, mass spectrometry, and chromatography. Included references are chosen according to their practical importance or perspectives for the future.

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