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Genetic effects of aging on fitness and nonfitness traits in laying hens housed three per cage.
| Content Provider | CiteSeerX |
|---|---|
| Author | Ledur, M. C. Liljedahl, L. -E. Mcmillan, I. Asselstine, L. Fairfull, R. W. |
| Abstract | way crosses, and two commercial lines were used to study the effects of aging on several parameters related to per-formance of fitness and nonfitness traits during the first laying cycle of hens housed three per cage. Egg number of the survivors (EPF) and egg number including mortal-ity and morbidity (EPM) were divided into 12 periods of 28 d each, starting at age at sexual maturity. Egg weight (EW), specific gravity (SG), and albumen height (AH) were measured at 240, 350, and 450 d of age. Mean hetero-sis was significant over time, except for AH, increasing in magnitude with age for EPF, EPM, EW, and AH. Recip-rocal effects were more important for egg quality than for egg production traits and were influenced by age. (Key words: genetic effect, aging, egg production, egg quality, multiple-bird cage) |
| File Format | |
| Access Restriction | Open |
| Subject Keyword | Nonfitness Trait Genetic Effect Egg Quality Egg Production Trait First Laying Cycle Recip-rocal Effect Egg Number Multiple-bird Cage Several Parameter Egg Weight Specific Gravity Mean Hetero-sis Sexual Maturity Egg Production Way Cross Commercial Line |
| Content Type | Text |