Template-Type: ReDIF-Article 1.0 Author-Name: C. Vieira Author-Workplace-Name: Estación Tecnológica de la Carne, Instituto Tecnológico Agrario de castilla y León, Guijuelo, Salamanca, Spain Author-Name: A. CERDEÑO Author-Workplace-Name: Estación Agrícola Experimental, Consejo Supervisor de Investigaciones Científicas, León, Spain Author-Name: E. Serrano Author-Workplace-Name: Estación Agrícola Experimental, Consejo Supervisor de Investigaciones Científicas, León, Spain Author-Name: A.R. Mantecón Author-Workplace-Name: Estación Agrícola Experimental, Consejo Supervisor de Investigaciones Científicas, León, Spain Title: Adult steers for beef production: breed effect on animal performance, retail yield and carcass quality Abstract: The production of adult steers for beef could be a profitable use of the territory in some mountain areas in the south of Europe, where this production is nearly inexistent, owing to an increase in the demand for meat from adult animals in specialized markets. The objective of this study was to evaluate the profitability of beef production in three breeds adapted to these areas but varying greatly in their mature size. The studied breeds were a specialized meat breed Limousin, a dual-purpose breed - Brown Swiss breed and - a Spanish local breed Asturiana de los Valles. Higher growth rates (P < 0.05) and higher carcass weights (P < 0.05) were achieved by Brown Swiss and Limousin. In relation to carcass value, better results of dressing percentage (P < 0.001), conformation (P < 0.001) and saleable meat percentages (P < 0.001) were obtained byLimousin. Due to preferences of the adult steers market for carcass with high fatness, Brown Swiss and Limousin could be more suitable to make this production profitable than Asturiana de los Valles (4.7 and 4.2 vs. 2.7, respectively, on the EUROP scale). Keywords: adult steers, carcass quality, breed effect, retail yield Journal: Czech Journal of Animal Science Pages: 467-474 Volume: 51 Issue: 11 Year: 2006 DOI: 10.17221/3966-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/3966-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-200611-0001.txt Handle: RePEc:caa:jnlcjs:v:51:y:2006:i:11:id:3966-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: Z. Drobná Author-Workplace-Name: Faculty of Agronomy, Mendel University of Agriculture and Forestry, Brno, Czech Republic Author-Name: J. Zelenka Author-Workplace-Name: Faculty of Agronomy, Mendel University of Agriculture and Forestry, Brno, Czech Republic Author-Name: E. Mrkvicová Author-Workplace-Name: Faculty of Agronomy, Mendel University of Agriculture and Forestry, Brno, Czech Republic Author-Name: D. Kladroba Author-Workplace-Name: Faculty of Agronomy, Mendel University of Agriculture and Forestry, Brno, Czech Republic Title: Influence of dietary linseed and sunflower oil on sensory characteristics of rainbow trout (Oncorhynchus mykiss) Abstract: This study describes the effects of dietary linseed and sunflower oil on the sensory characteristics of rainbow trout (Oncorhynchus mykiss) fillets. Rainbow trout were fed a diet containing either 2.5% or 5% of linseed or sunflower oil or 5% mixture of both oils (2.5% of each). Control group received a commercial feed mixture. A selected and trained panel carried out descriptive sensory tests on fish fillet cross-sections. The addition of vegetable oil into fish feed did not affect firmness, juiciness or intensity of total taste but had a significant impact on colour, intensity of odour and fish oily taste. A higher content of n-3 polyunsaturated fatty acids (PUFA) in linseed oil, in comparison with sunflower oil, is often responsible for the development of an off-flavour. No trout fillet was rejected owing to the off-flavour presence. Both concentrations of linseed oil decreased the intensity of fish oily taste. Therefore, for the partial replacement of fish oil in rainbow trout feed it is recommended the use linseed oil, which is a good source of n-3 PUFA. Keywords: rainbow trout feeding, vegetable oils, meat quality, organoleptic properties, PUFA Journal: Czech Journal of Animal Science Pages: 475-482 Volume: 51 Issue: 11 Year: 2006 DOI: 10.17221/3967-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/3967-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-200611-0002.txt Handle: RePEc:caa:jnlcjs:v:51:y:2006:i:11:id:3967-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: M. Oravcová Author-Workplace-Name: Slovak Agricultural Research Centre, Nitra, Slovak Republic Author-Name: M. Margetín Author-Workplace-Name: Slovak Agricultural Research Centre, Nitra, Slovak Republic Author-Name: D. Peškovičová Author-Workplace-Name: Slovak Agricultural Research Centre, Nitra, Slovak Republic Author-Name: J. Daňo Author-Workplace-Name: Slovak Agricultural Research Centre, Nitra, Slovak Republic Author-Name: M. Milerski Author-Workplace-Name: Research Institute of Animal Production, Prague, Czech Republic Author-Name: L. Hetényi Author-Workplace-Name: Slovak Agricultural Research Centre, Nitra, Slovak Republic Author-Name: P. Polák Author-Workplace-Name: Slovak Agricultural Research Centre, Nitra, Slovak Republic Title: Factors affecting milk yield and ewe's lactation curves estimated with test-day models Abstract: Test-day records of purebred Tsigai, Improved Valachian and Lacaune ewes were analysed with a general linear model in order to investigate the effects of flock-test day, lactation number, days in milk, litter size and month of lambing. In total, 121 576 (Tsigai), 247 902 (Improved Valachian) and 2 196 (Lacaune) test-day records gathered over the period 1995-2005 were included in the analyses. Average daily milk yields were 0.604 ± 0.279 kg (Tsigai), 0.595 ± 0.243 kg (Improved Valachian) and 1.053 ± 0.475 kg (Lacaune). The significant (P < 0.05) or highly significant (P < 0.01) effects of flock-test day, lactation number (except for Lacaune), days in milk, litter size (except for Lacaune) and month of lambing (either fixed effects or covariates) tested by Fisher's tests were shown. The model explained about 50% of daily milk yield variability, with coefficients of determination as follows: 0.479 for Improved Valachian; 0.487 for Tsigai; 0.537 for Lacaune. Differences in estimated least-squares means were tested using multiple-range Scheffe's tests. A lower daily milk yield was found for the first lactation, single litter and lactations starting in March in comparison with daily milk yield for the second and third lactations (except for Lacaune), multiple litter and lactations starting in January and February (except for Improved Valachian). Ali-Schaeffer regression adopted for sheep was used for the fitting of lactation curve according to breed. Keywords: Tsigai, Improved Valachian, Lacaune, milk yield, environmental effects, lactation curve Journal: Czech Journal of Animal Science Pages: 483-490 Volume: 51 Issue: 11 Year: 2006 DOI: 10.17221/3968-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/3968-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-200611-0003.txt Handle: RePEc:caa:jnlcjs:v:51:y:2006:i:11:id:3968-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: E. Göpfert Author-Workplace-Name: Veterinary Research Institute, Brno, Czech Republic Author-Name: M. Trčková Author-Workplace-Name: Veterinary Research Institute, Brno, Czech Republic Author-Name: R. Dvořák Author-Workplace-Name: University of Veterinary and Pharmaceutical Sciences, Brno, Czech Republic Title: The use of treated rape cake in a calf starter diet Abstract: The objective of the experiment was to evaluate the effect of starter diet containing 10% of treated rape cake (TRC) with a reduced glucosinolate content on calf growth, development and health. The experiment included 45 calves allocated into 3 groups. After the colostrum period (5 days) the calves were fed 4 l of pooled fresh milk per calf/day and one of the starters ad libitum. The control group (S) was fed Standard starter with components with a standard nutrient content including fibre. Comparative group T was fed Telstar starter, which contained whole maize kernels and protein pellets. Experimental group G was fed Grant starter containing 10% of treated rape cake. The calves were fed hay ad libitum from 10 weeks of age. The average starter consumption (calf/day) over a 90-day feeding period was 1.34, 1.72 and 1.45 kg of the Standard, Telstar and Grant diet, respectively. An insignificantly higher body weight of calves was recorded for the Grant group at the end of the experimental period. When the calculated indices were compared, it was obvious that the weight gains obtained with experimental starters Grant and comparative Telstar were by 4.0% higher and by 5.4% lower, respectively, than in the control group Standard. No significant changes in the parameters of nitrogen, energy, lipid and mineral metabolism, health status, hepatic parenchyma and thyroid function were observed throughout the experimental period. The diet based on experimental starter Grant had no adverse effect on the ruminal fermentation in calves. It may therefore be concluded that the starter diet with 10% content of treated rape cake had no adverse effect on calf growth and performance. Keywords: Brassica napus, treated rape cake, nutrient consumption, weight gain, metabolic profile, rumen fluid Journal: Czech Journal of Animal Science Pages: 491-501 Volume: 51 Issue: 11 Year: 2006 DOI: 10.17221/3969-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/3969-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-200611-0004.txt Handle: RePEc:caa:jnlcjs:v:51:y:2006:i:11:id:3969-CJAS