Template-Type: ReDIF-Article 1.0 Author-Name: J. Přibyl Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: H. Krejčová Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: J. Přibylová Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: I. Misztal Author-Workplace-Name: Univesity Georgia, Athens, USA Author-Name: J. Bohmanová Author-Workplace-Name: University Guelph, Canada Author-Name: M. Štípková Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Title: Trajectory of body weight of performance tested dual-purpose bulls Abstract: 6 508 bulls of dual-purpose cattle at performance-test stations were weighed at intervals of 30 days from birth to 420 days. After all editing a total of 74 558 weight records were available. Live weight was evaluated by orthogonal Legendre Polynomial (LP) of degree 4 and by Linear Spline function (SP) with 5 knots. The fixed effects of test-day-year-station of weighing (TDS) and LP within station-year explain together 97% of variability. Variance components were estimated by REML (REMLF90 programme) taking into account heterogeneous variance during growth. The basic model included fixed effects: TDS, and fixed regression on age (LPF), and random regression for additive genetic (SPG) and permanent environmental of the animal (SPPE) effects. Variability of all components increases with age. During the 50-400 day period the heritability is 0.28 on average. Heritability increases with the age of the animal; it is the highest at the end of the period. Correlations for body weights between different ages of the animal are high. Keywords: cattle, random regression, heritability, genetic correlation, growth curve, linear spline Journal: Czech Journal of Animal Science Pages: 315-324 Volume: 52 Issue: 10 Year: 2007 DOI: 10.17221/2340-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/2340-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-200710-0001.txt Handle: RePEc:caa:jnlcjs:v:52:y:2007:i:10:id:2340-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: R. Pilarczyk Author-Workplace-Name: Department of Ruminant Science, Agriculture University of Szczecin, Poland Author-Name: J. Wójcik Author-Workplace-Name: Department of Ruminant Science, Agriculture University of Szczecin, Poland Title: Comparison of calf rearing results and nursing cow performance in various beef breeds managed under the same conditions in north-western Poland Abstract: We compared the results of calf maternal nursing and cow performance in 5 beef breeds managed under equal conditions in the region of West Pomerania. The study involved 549 cows and 1 979 calves (1 007 heifers and 972 bulls) of the following breeds: Red Angus, Salers, Hereford, Limousin, and Simmental. The cows and their calves were managed outdoors for one year. Feeding and management systems were the same for all the breeds during the studied period. The calves remained with their mothers until 6 to 9 months of age. Under intensive feeding, we recorded very good calf rearing parameters with very good or good milk performance of the cows. The best results were achieved by the Simmental cows and calves. Both the heifers and calf-bulls of this breed exhibited significantly (P ≤ 0.01) higher weaning weights adjusted to 210 days of age as well as daily gains from birth to weaning. The weaning weights of the calves were higher from 37 to 93 kg and daily gains from 45 to 280 g. The Hereford cows and calves also achieved very good parameters. Relatively poorer in terms of production performance were Red Angus, as compared with the other breeds, and Limousin cows whose calves produced the lowest body weights and had the lowest daily gains as well. Keywords: beef cattle, breeds, maternal nursing, body weight, gains Journal: Czech Journal of Animal Science Pages: 325-333 Volume: 52 Issue: 10 Year: 2007 DOI: 10.17221/2342-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/2342-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-200710-0002.txt Handle: RePEc:caa:jnlcjs:v:52:y:2007:i:10:id:2342-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: P. Humpolíček Author-Workplace-Name: Department of Animal Morphology, Physiology and Genetics, Mendel University of Agriculture and Forestry in Brno, Czech Republic Author-Name: T. Urban Author-Workplace-Name: Department of Animal Morphology, Physiology and Genetics, Mendel University of Agriculture and Forestry in Brno, Czech Republic Author-Name: V. Matoušek Author-Workplace-Name: Department of Special Animal Science, Faculty of Agriculture, University of South Bohemia, Czech Republic Author-Name: Z. Tvrdoň Author-Workplace-Name: Genosuvis, Co. Olomouc, Olomouc, Czech republic Title: Effect of estrogen receptor, follicle stimulating hormone and myogenin genes on the performance of Large White sows Abstract: The study was designed to determine the associations between the Estrogen Receptor Gene (ESR - PvuII), Follicle Stimulating Hormone Gene (FSHB - HaeIII) and Myogenin Gene (MYOG - MspI) with traits characterizing the sow efficiency comprehensively. Concretely, the age of the first conception (AFC), service period (SP), insemination interval (InI), total number of piglets born (TNB), number of piglets born alive (NBA), number of piglets weaned (NW), lean meat content (LMC), backfat thickness (BFT) and average daily gain (ADG) were included in the study. Significant effects of ESR and FSHB genes on litter size (particularly in the second parity) and on reproduction traits were found in the investigated population. The influence of MYOG gene on reproduction traits was observed but there was no effect of this gene on litter size. None of the included genes had an effect on growth traits. The results outline the possible application of the above-mentioned genes in selection of Large White sows. Keywords: litter size, growth, reproduction, ESR, FSHB, MYOG Journal: Czech Journal of Animal Science Pages: 334-340 Volume: 52 Issue: 10 Year: 2007 DOI: 10.17221/2343-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/2343-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-200710-0003.txt Handle: RePEc:caa:jnlcjs:v:52:y:2007:i:10:id:2343-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: L. Zita Author-Workplace-Name: Department of Animal Husbandry, Czech University of Life Sciences in Prague, Czech Republic Author-Name: E. Tůmová Author-Workplace-Name: Department of Animal Husbandry, Czech University of Life Sciences in Prague, Czech Republic Author-Name: V. Skřivanová Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: Z. Ledvinka Author-Workplace-Name: Department of Animal Husbandry, Czech University of Life Sciences in Prague, Czech Republic Title: The effect of weaning age on performance and nutrient digestibility of broiler rabbits Abstract: The effect of weaning age on growth, feed consumption, digestibility of nutrients, carcass yield, mortality and parasite incidence was studied in a balance experiment. Forty Hyplus® rabbits proceeding from a commercial rabbitry were assigned to four groups of 10 rabbits according to weaning age at 25, 28, 31 and 35 days. The experimental diet had 17.03% crude protein, 4.66% fat and 18.30% crude fibre. Feed and water were available ad libitum. At the end of the experiment, at 84 days of age, six rabbits per group were slaughtered. In the experiment, most results of performance were not significantly (P ≤ 0.05) affected by weaning age. Only the rabbits weaned at 25 days of age had higher live weight (P ≤ 0.05) at the age of 35 days (996, 986, 971 and 910 g, respectively), but at the end of the experiment we did not find any differences between groups. Higher digestibility of nutrients was recorded in the second collection period. In the first collection period the digestibility of nutrients was higher in rabbits weaned at 25 days of age in comparison with the other groups. No differences between groups in the digestibility of nutrients were observed in the second period. The age of weaning did not influence carcass characteristics. Dressing percentage was insignificantly higher in rabbits weaned at 25 and 35 days of age (53.11 and 53.07%, respectively) in comparison with rabbits weaned at 28 and 31 days of age (50.89 and 52.67%, respectively). There was no significant effect of weaning age on mortality. The incidence of Eimeria ssp. was the highest after weaning in rabbits at the age of 35 days. Keywords: rabbit, early weaning, growth, carcass characteristics, nutrient digestibility, parasite incidence, mortality Journal: Czech Journal of Animal Science Pages: 341-347 Volume: 52 Issue: 10 Year: 2007 DOI: 10.17221/2341-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/2341-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-200710-0004.txt Handle: RePEc:caa:jnlcjs:v:52:y:2007:i:10:id:2341-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: B. Písaříková Author-Workplace-Name: Veterinary Research Institute, Brno, Czech Republic Author-Name: J. Peterka Author-Workplace-Name: University of South Bohemia, České Budějovice, Czech Republic Author-Name: M. Trčková Author-Workplace-Name: Veterinary Research Institute, Brno, Czech Republic Author-Name: J. Moudrý Author-Workplace-Name: University of South Bohemia, České Budějovice, Czech Republic Author-Name: Z. Zralý Author-Workplace-Name: Veterinary Research Institute, Brno, Czech Republic Author-Name: I. Herzig Author-Workplace-Name: Veterinary Research Institute, Brno, Czech Republic Title: The content of insoluble fibre and crude protein value of the aboveground biomass of Amaranthus cruentus and A. hypochondriacus Abstract: Twenty samples of the aboveground biomass of Amaranthus cruentus (varieties Olpir, Amar 2 RR-R 150, and A 200 D) and A. hypochondriacus (variety No. 1008) were analysed to determine their nutritional value during the experimental period covering five growth stages from inflorescence emergence till full ripening of grain. During plant growth, from day 80 to day 120 of cultivation, the nutritional value decreased. This was demonstrated by an increase in insoluble fibre and a reduction in crude protein content. The content of neutral detergent fibre (NDF) in the dry matter increased from 356 to 420 g/kg (P < 0.01); acid detergent fibre (ADF) from 238 to 286 g/kg (P < 0.01); acid detergent lignin (ADL) from 22.9 to 53.4 g/kg (P < 0.01). The content of crude protein in the dry matter of the investigated amaranth varieties decreased from 174 to 109 g/kg (P < 0.01). In the Czech Republic the aboveground biomass of the cultivated A. cruentus and A. hypochondriacus could be used as a good source of fibre and protein in animal diets when harvested in the period from day 80 to 90 of cultivation. Keywords: amaranth varieties, vegetation stage, NDF - neutral detergent fibre, ADF - acid detergent fibre, ADL - acid detergent lignin Journal: Czech Journal of Animal Science Pages: 348-353 Volume: 52 Issue: 10 Year: 2007 DOI: 10.17221/2339-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/2339-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-200710-0005.txt Handle: RePEc:caa:jnlcjs:v:52:y:2007:i:10:id:2339-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: T. Mikolajczyk Author-Workplace-Name: Department of Ichthyobiology and Fisheries, University of Agriculture, Cracow-Mydlniki, Poland Author-Name: M. Sokolowska-Mikolajczyk Author-Workplace-Name: Department of Ichthyobiology and Fisheries, University of Agriculture, Cracow-Mydlniki, Poland Author-Name: J. Chyb Author-Workplace-Name: Department of Ichthyobiology and Fisheries, University of Agriculture, Cracow-Mydlniki, Poland Author-Name: P. Szczerbik Author-Workplace-Name: Department of Ichthyobiology and Fisheries, University of Agriculture, Cracow-Mydlniki, Poland Author-Name: M. Socha Author-Workplace-Name: Department of Ichthyobiology and Fisheries, University of Agriculture, Cracow-Mydlniki, Poland Author-Name: M. Foks Author-Workplace-Name: Inland Fisheries Institute, Fisheries Research Station in Zator, Poland Author-Name: M. Duc Author-Workplace-Name: Department of Ichthyobiology and Fisheries, University of Agriculture, Cracow-Mydlniki, Poland Author-Name: P. Epler Author-Workplace-Name: Department of Ichthyobiology and Fisheries, University of Agriculture, Cracow-Mydlniki, Poland Title: LH secretion and 17ββ-estradiol concentration in the blood plasma and hypothalamus of goldfish (Carassius auratus gibelio B.) and common carp (Cyprinus carpio L.) treated with fadrozole (aromatase inhibitor) and GnRH analogues Abstract: Fadrozole - a non-steroidal aromatase inhibitor was applied to common carp and goldfish to examine its ability to potentiate the stimulatory action of GnRH analogues on LH secretion in vivo. The goal of the project was to find a substitute for antidopaminergic drugs used with GnRH analogues in fisheries practice to stimulate ovulation in fish bred in captivity. The first trials on goldfish showed a moderate ability of fadrozole to potentiate salmon GnRH analogue stimulation, weaker than that obtained with pimozide (dopamine antagonist). No ovulation in fadrozole-treated fish was observed. Several experiments performed in two consecutive reproductive seasons (different treatment regimes and doses of fadrozole) neither improved nor confirmed the results obtained in the first year. The analysis of 17β-estradiol levels in the blood plasma and in hypothalami showed no changes in the concentration of this steroid in fadrozole-treated fish in comparison with the controls. This shows that fadrozole is not able to replace the antidopaminergic drugs used in fisheries practice and cannot be considered as a potential ovulation inducer in cyprinids. Keywords: aromatase inhibitor, LH, estradiol, goldfish, carp, ovulation Journal: Czech Journal of Animal Science Pages: 354-362 Volume: 52 Issue: 10 Year: 2007 DOI: 10.17221/2344-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/2344-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-200710-0006.txt Handle: RePEc:caa:jnlcjs:v:52:y:2007:i:10:id:2344-CJAS