Czech Journal of Animal Science, 2006 (vol. 51), issue 7
Chemical composition, sensory characteristics, and fatty acid profile of muscle from Aberdeen Angus, Charolais, Simmental, and Hereford bulls
D. Bureš, L. Bartoň, R. Zahrádková, V. Teslík, M. Krejčová
Czech J. Anim. Sci., 2006, 51(7):279-284 | DOI: 10.17221/3940-CJAS 
Aberdeen Angus (AA), Charolais (CH), Simmental (SI), and Hereford (HE) bulls were used in two fattening experiments with the objective of determining breed differences in chemical composition, sensory characteristics, and fatty acid profile of m. longissimus thoracis et lumborum. The target slaughter live weights were set at 550 kg for earlier maturing breeds AA and HE and 630 kg for later maturing breeds CH and SI. Intramuscular lipid contents were higher in AA and HE (P < 0.05) than in CH and SI, but cholesterol contents were similar among the breed groups. The highest content of dry matter was found in HE (P < 0.05),...
Selection indexes for bulls of beef cattle
P. Šafus, J. Přibyl, Z. Veselá, L. Vostrý, M. Štípková, L. Stádník
Czech J. Anim. Sci., 2006, 51(7):285-298 | DOI: 10.17221/3941-CJAS
Three selection indexes were constructed for bulls of beef cattle: IM for terminal crossing (in dairy herds), IZ for the selection of foundation sires for beef herd and IS for the selection of bulls for beef herd. Each index was constructed in five variants that differed in the number of used traits from the most important ones to all traits with known breeding values. The sources of information were breeding values routinely calculated in performance testing - 10 breeding values for direct and maternal effects for easy calving and growth, breeding value for daily gain of bulls at performance-testing stations and 10 breeding...
The relationship between linear type traits and stayability of Czech Fleckvieh cows
J. Bouška, M. Vacek, M. Štípková, A. Němec
Czech J. Anim. Sci., 2006, 51(7):299-304 | DOI: 10.17221/3942-CJAS
The relationship between linear type traits and stayability was analyzed in 34 492 Czech Fleckvieh cows. Pearson correlation coefficients were calculated between linear type traits and stayability of cows. The observed correlations were r = -0.04 for stature, r = -0.08 for muscularity, r = -0.14 for rump angle, r = -0.03 for rump width, r = -0.01 for rear legs set and r = -0.18 for foot angle. The following correlations were found for udder traits: r = 0.18 for fore udder, r = 0.12 for rear udder, r = 0.16 for central ligament, r = -0.06 for teat placement, r...
Elimination of dust production from stables for dairy cows
J. Dolejš, O. Mašata, O. Toufar
Czech J. Anim. Sci., 2006, 51(7):305-310 | DOI: 10.17221/3943-CJAS
Three experiments with dairy cows were conducted in an air-conditioned stable under controlled conditions. The objective of the study was to determine the effect of the regulated ionic microclimate on the emission of dust particles (aerosol) up to the diameter of 10 μm (PM10). Four dairy cows were housed in common straw-bedded boxes and the stable was equipped with a vacuum ventilation system. To regulate the ionic microclimate, the apparatus Agri 1 000 (maximum voltage 7 kV, current 25 μA) was used. Thus the airborne dust concentration in the stable (42-132 μg/m3) was reduced by 12.7-26.2%. In experiments B and C statistical...
Effect of age at slaughter on carcass characteristics and carcass composition in lambs of mountain Greek breeds
B. Skapetas, E. Sinapis, J. Hatziminaouglou, A. Karalazos, J. Katanos
Czech J. Anim. Sci., 2006, 51(7):311-317 | DOI: 10.17221/3944-CJAS
Forty male lambs of the mountain Greek breed were used to evaluate the effect of age at slaughter on carcass characteristics and composition. The slaughter of lambs was carried out at the age of 30, 45, 60, 75 and 90 days. The slaughter procedure, carcass dissection and carcass composition were realized according to the standard method of CIHEAM-AGRIMED programme. The results of this work showed that the lambs of different age groups did not differ in dressing percentage significantly. The proportion of muscles showed a tendency of increase with the increasing slaughter age but the differences were not significant. The proportion of total fat in carcass...
The quality comparison of eggs laid by laying hens kept in battery cages and in a deep litter system
V. Pištěková, M. Hovorka, V. Večerek, E. Straková, P. Suchý
Czech J. Anim. Sci., 2006, 51(7):318-325 | DOI: 10.17221/3945-CJAS
At present the laying hen rearing is transformed into alternative housing systems which include a deep litter system. As for the poultry nutrition, the replacement of animal protein with vegetable protein in poultry feed is applied. Therefore, in an experiment we evaluated the quality of eggs from laying hens in the cage system as compared to the deep litter system with vegetable protein substituted for animal protein in their feed. 72 ISA Brown laying hens were placed into the experiment. 36 laying hens were kept in the deep litter system and 36 laying hens were kept in conventional cages for laying hens. For the period of 9 months, 36 eggs from the...