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Hodnocení užitkových vlastností potomstva brojlerových slepic
MASÁROVÁ, Anna
The aim of the diploma thesis was to evaluate the performance of commercial broiler chicken genotypes Ross 308, Cobb 500 and Hubbard F15. Parental test consisted of parent rearing up to the age of 22 weeks, the laying period up to the age of 62 weeks and from fattening progeny tests (lasting for 35 days or else 42 days). Hybrid Ross 308 chickens reached the highest live weight at the end of the rearing period. Hubbard F15 chickens had the lowest feed consumption per head and day and also the lowest mortality rate. Hybrid Hubbard F15 showed the highest number of hatched chickens per 1 laying hen (137.2 pcs), the lowest feed consumption per head and day (149.4 g) and the highest fertility of hatching eggs (9,2 %). Hybrid Ross 308 showed the highest weight of hatching eggs and live weight at the end of the laying period (cockerels 5 029 g, pullets 4 310 g). Cobb 500 cockerels (2 397 g) and Hubbard F 15 pullets (2 145 g) showed the highest live weight during the 35 day fattening period. The highest breast weight was at the hybrid Cobb 500 (516.9 g) and the thighs weight was the highest at Hubbard F15 (511.9 g). The highest carcass yield was observed at hybrid Cobb 500 (76.30%). During the extended fattening period of 42 days had the highest live weight cockerels Ross 308 (3 096 g), Cobb 500 and Hubbard F15 pullets (2 688 g and 2 682 g). The highest breast weight was observed at hybrid Ross 308 (697.0 g) and thighs weight at hybrid Hubbard F15 (707.6 g). The highest carcass yield was at hybrid Hubbard F15 (78.0%).
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Analýza výkrmu vybraných hybridů kuřat
JURNÁ, Martina
The experiment consisted of 78 production batches of broiler chicken out of which 52 production batches were hybrid chickens Cobb 500 and 26 production batches were Ross 308. During 13 production batches was used green lighting for the feeding regimen and during 65 batches was used white light. The broilers were slaughtered at the age of 32.96 days. The Ross 308 hybrid (2.13 kg) reached 0.09 kg higher live weight compared to hybrid Cobb 500 (2.04 kg). In the case of Ross 308 there was 0.03 kg lower feed consumption (1.66, resp. 1.69 kg) and 0.15% lower mortality (3.54, resp. 3.68%). The difference in the index of European Efficiency Factor was 23 points in favour of Ross 308 (376, resp. 353 points). The mean length of production batch with green lighting was 0.54 day shorter (32.51, resp. 33.05 days). The difference in live weight was very small in production batches with different lighting colour regimes (0.05 kg). The difference in feed consumption per 1 kg of weight gain was 0.06 kg in favour of broilers fattening while using green light. Mortality rate of broilers was 0.3% lower when fattening while using white light. The European Efficiency Factor was 9 points higher while fattening using green light. The correlation of live weight of broiler at slaughter with the age of breeding flock was r = 0.42, moderate, statistically highly significant.
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Analysis of use characteristics of slow growing chicken hybrid
DUPAL, Jan
The main aim of the diploma thesis was to analyze the use characteristics of chicken hybrids with slow growth rate. Following hybrids were analyzed: combination of JA 757, who were fed until 49 days of their age and combination of Pac JA with feed length of 56 days. The average live weight of hybrid combination JA 757 was 2 169 g, the feed consumption per kg of weight gain averaged at 2 119 g and the selection rate reached 0.5%. The combination Pac JA reached live weight at slaughter date of 2 109 g, the feed consumption was 2 366 g and 0.88% chickens was selected. The value of Production Efficiency Factor was higher for the hybrid JA 757 (208) compared with the hybrid Pac JA (158). It was found out that the carcass yield of the hybrid JA 757 was about 3.8% higher (74.7% vs. 70.9%) compared to the hybrid Pac JA. Similarly the weight of the breast muscles reached the weight of 405 g in case of the JA 757 which was 53 g more than in case of the Pac JA (352 g). The leg muscle difference was 132 g in favor of the JA 757 (499 g vs. 367 g) while the weight of abdominal fat was lower by 5.5 g (44 vs. 49.5 g). Therefore it can be stated that the difference was statistically highly significant. Furthermore it was found out that cocks reached higher breast and leg muscle weight than hens of both hybrids. The difference was 33 g and 106 g for JA 757 hybrids and 57 g and 79 g for Pac JA hybrids respectively. Also here the difference was statistically highly significant and statistically significant respectively. Overall the hybrid JA 757 proved to have higher genetic potential in intensity growth and also in carcass utility.
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Indicators of the egg yield and of the fattening in the geese breeding
KULHAN, Petr
The aim of the thesis was to elaborate a literature search about utility characters of geese and to analyse a basic statistical indicators selected indicators of egg yield and of fattening performance in the selection breeding of geese, with a view to selection and to inbreed in the Czech Republic, to the conditions for certification of selection breeding, including the purpose and mission of this breeding. Geese breeding and its technology, domestic geese properties and factors, which affect them, are described further in this work. Attention was also paid to veterinary monitoring and to care of geese breeding.
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