Journal
POULTRY SCIENCE
Volume 91, Issue 5, Pages 1269-1275Publisher
OXFORD UNIV PRESS
DOI: 10.3382/ps.2011-01951
Keywords
layer; broiler breeder; age; temperature; laying pattern
Categories
Funding
- Ministry of Education, Youth and Sports of the Czech Republic [MSM 6046070901]
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The effect of production type (layer vs. broiler breeder), age (onset and end of laying cycle), and temperature (20 and 28 degrees C) on various aspects of the egg production process and quality was evaluated. Highly significant differences were detected between laying hens and broiler breeders (P <= 0.001) in all production parameters. Similarly, age significantly affected rate of lay (P <= 0.001; 75.4% for young vs. 62.6% for old), mean sequence length (P <= 0.001; 7.7 d for young vs. 2.6 d for old), and time of oviposition (P <= 0.001). However, there was no effect of temperature on rate of lay, sequence length, or feed intake. Significant interactions between hen type and age were apparent in rate of lay (P <= 0.001), sequence length (P <= 0.001), and time of oviposition (P <= 0.001). A significant interaction between production type and age (P <= 0.015) was evident in egg weight, but egg component proportions were dependent only on hen type. Egg shape index was significantly affected by age (P <= 0.004), by temperature (P <= 0.028), and an interaction between type and age (P <= 0.001). Specific gravity declined with age (P <= 0.035) and increasing temperature (P <= 0.013).
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