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Produkce a zpracování drůbeže v české republice
SIAWELA, Saviour
The absolute and most fundamental aim of this bachelor's thesis is to compare and understand the production and processing measures of broiler parent combination and their offspring for the desirable breeding type for commercial breeders of broiler chickens COBB 500 and ROSS 308 in that order. The data was obtained from Mezinárodní testování drůbeže, státní podnik (International poultry testing, state enterprise) in Ústrašice. Parent testing of COBB 500 and ROSS 308 consisted of parent rearing periods of up to 154 days of age respectively. The fattening test was made in two sets of 35 days and 42 days in that order. Testing evidence results suggested that ROSS 308 chickens obtained a quite substantial live body mass/weight compared to COBB 500 on due ending course of the set rearing period in parent testing. However, lower feed consumption per head/day was realized in COBB 500 hybrids with reference to this period respectively. In addition to that, lower feed consumption was observed per day/head in COBB 500 hybrids during the laying period. Despite the deduced observations though, a higher egg number/hen housed was laid by ROSS 308 hens but the live hatched chickens per laying hen were higher in COBB 500 hens. Higher live body mass/weight and lower feed consumption per kg gain hybrids were realized in ROSS 308 at the fattening test period of 35 days of age. On the other hand, roosters of both hybrid combinations COBB 500 and ROSS 308 gained a higher live body mass/weight and lower feed consumption per kg gain. 2.3 % of chickens died during the fattening period in each hybrid combination. Higher carcass yield, breast, and thighs muscle mass were in this work determined in ROSS 308 hybrids. This is because ROSS 308 hybrids successfully attained a higher live body/weight of at least about 14 g during a prolonged fattening testing period of 42 days of age. Higher live body mass/weight however and lower feed consumption was determined in cocks obviously in comparison with hens in both genotypes. In that order,4.6 % of COBB 500 chickens and 5.4 % of ROSS 308 chickens died during the fattening period due to improper ventilation yet a very imperative factor to animal welfare at large. genotypic difference between COBB 500 and ROSS 308 was at 0.2 % in slaughter yield, 7 g in breast mass, and 9 g in thighs weight respectively.
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