Analýza ukazatelů výkrmnosti u kuřecích hybridů

The aim of this thesis was to analyse fattening parameters in chicken hybrids at a particular farm. 256 batches (7 836 986 chickens) were included into the study. 56 batches were carried out in years 2016 and 2018. Remaining 48 batches were carried out in years 2017, 2019 and 2020. The Ross hybrid 308 was fattened during all the mentioned years. However, the Cobb 500 hybrid was fattened only in years 2016 (13%), 2018 (25%) and 2019 (29%). Both hybrids showed nearly the same feeding length (Cobb 500 hybrid 0.28 days shorter), live weight (Cobb 500 hybrid 0.03 kg higher) and feed conversion ratio per kg of weight gain (Cobb 500 hybrid 0.02 kg lower). The Cobb 500 hybrid showed 0.52% higher mortality (p < 0.05) and 14.6 points higher efficiency feeding index (EFI), (p < 0.05). The shortest feeding length was in year 2017 (33.15 days) and the longest in year 2016 (p < 0.05). The live weight showed an upward trend from year 2016 (1.98 kg) to 2018 (2.19 kg). However, in years 2019 and 2020 the live weight stagnated on the value of 2.18 kg. The lowest feed mixture consumption per 1 kg of weight gain was in year 2019 (1.47 kg), and the highest in year 2016 (1.61 kg; p < 0.05). The lowest mortality was recorded in 2017 (2,90%) contrary to year 2018 (3,64%). The difference was 0,74% (p < 0.05). The efficiency feeding index (EFI) was growing between years 2016 (353.3 points) to 2019 (431.9 points). Then in year 2020 it dropped to 427.7 points. The dependence between the age of parents in the parent stock and live weight of chickens was moderate (r = 0.38; p < 0,001). Correlation relationship between the live weight of chickens at the age of day 1 and day 33 was medium (r = 0.60; p < 0.001). The lowest mortality rate from all the batches was in the first batch of 2016 (1.31%). On the contrary, the highest mortality rate was recorded during the fourth batch of year 2018 (4,30%)