A total of 169 batches of chicken (almost 4 million pieces) were included in the survey, of which 88 batches were Cobb 500 chicken and 81 batches Ross 308 chickens. The difference in the European Production Efficiency Factor (EPEF) was 30 points in favour of the Ross 308 hybrid when compared with the Cobb 500 hybrid (395 and 365 points respectively, P < 0.05). During the monitored years, the EPEF gradually increased from 357 points in 2014 to 404 points in 2017, i.e. by 47 points (P < 0.05). From the perspective of the hatchery influence (A and B), the Ross 308 hybrid was found have almost identical EPEF (394 and 395 points respectively). The EPEF of the Cobb 500 hybrid was 27 points higher in hatchery B (380 and 353 points respectively, P < 0.05). The dependence of the live weight of the hybrid at slaughter on the age of the parent flock was found to be r = 0.41, i.e. moderate, statistically significant. A higher EPEF was achieved when fattening in green light as compared with white light. For the Cobb 500 hybrid, the difference was only 2 points (367 and 365 points respectively). For Ross 308 hybrid, the difference was higher, 11 points (404 and 393 points respectively). In the high-capacity hall, fattening took longer than in the small-capacity hall. The difference amounted to 0.92 days for the Cobb 500 hybrid (33.66 and 32.74 days respectively) and 0.11 days for the Ross 308 hybrid (33.11 and 33.00 days respectively). The differences in live weight were small, i.e. 0.01 kg for the Cobb 500 hybrid (2.09 and 2.10 kg respectively) and 0.02 kg for the Ross 308 hybrid (2.12 and 2.14 kg respectively), as were the differences in the feed mixture consumption per 1 kg weight gain, i.e. 0.02 kg for the Cobb 500 hybrid (1.57 and 1.59 kg respectively) and 0.03 kg for the Ross 308 hybrid (1.56 and 1.53 kg respectively). Higher mortality was found in the high-capacity hall. It was slightly higher, by 0.06 %, for the Cobb 500 hybrid (3.26 and 3.20 % respectively). For the Ross 308 hybrid, there was a higher difference of 0.72 % (3.46 and 2.74 % respectively). The EPEF was found to be slightly lower in the high-capacity hall compared to the low-capacity hall. The difference amounted to 9 points for the Cobb 500 hybrid (383 and 392 points respectively) and 17 points for the Ross 308 hybrid (395 and 412 points respectively).
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:376235 |
| Date | January 2018 |
| Creators | JURNÁ, Martina |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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