The effect of oviposition time and genotype on egg quality characteristics in egg type hens
2007
Tumova, E.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Specialni Zootechniky | Zita, L.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Specialni Zootechniky | Hubeny, M.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Specialni Zootechniky | Skrivan, M.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Specialni Zootechniky | Ledvinka, Z.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Specialni Zootechniky
Laying hens of the Blue strain, Plymouth Rock and their F1 crosses from 20 to 64 weeks of age and housed on litter were used in order to investigate the effect of genotype and oviposition on egg quality characteristics. Eggs were collected at 6.00, 10.00 and 14.00 h every two days in a 28-day interval (720 eggs in total were examined). The time of oviposition was influenced by the genotype. The highest number of eggs was collected in Plymouth Rock hens at 6.00 (53.5%), the lowest one in Blue hens at 14.00 (11.1%). There were interactions between the time of oviposition and genotype for egg weight. Eggs laid in the morning at 6.00 were significantly heavier (60.5 g, 64.9 g and 62.1 g, respectively) in comparison with eggs laid in the afternoon (59.3 g, 62.4 g and 62.7 g, respectively). The heaviest eggs were produced by Plymouth Rock animals. Significant interactions were observed for eggshell weight. Afternoon eggs had the heaviest eggshells (5.6 g, 5.8 and 5.9 g, respectively). The egg shape index was affected by the genotype and time of oviposition, whereas the Haugh units and the yolk index were significanlty influenced by the genotype only.
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