Effect of hatching egg weight selected on egg weight produced from chickens of subsequent generations of SPF chickens maintained as a closed flock.
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概要
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Two experiments were carried out to prevent decreasing egg weight of specific patho-gen free (SPF) chickens maintained as a closed flock. Hatching eggs were divided into four groups, S (45-50g), M (51-55g), ML (56-60g), L (61-65g) size, respectively.In Exp. I, SPF chicks hatched from the eggs grouped were raised. Egg weight pro-duced from the pullets were measured from 21 to 43 weeks of age. After 25 weeks of age, mean egg weight of the pullets hatched from ML and L size eggs was significantly greater than that of the pullets hatched from S and M size eggs. Significant differences, however, were not observed between ML and L size egg groups and between S and M size egg groups.In Exp. II, SPF chickens of fourth generation of two strains (O•GO and GO•OG) were produced from M size eggs of third generation chickens. Fifth generation chickens of the strains also produced from ML and L size eggs of chickens of fourth generation.The chickens of fifth generation of both strains produced more number of ML and L size eggs than the chickens of fourth generation, respectively. Egg production, fertility and hatchability of eggs produced from chickens of fourth and fifth generations of both strains were not different from them of chickens of third or earlier generations, respectively.From these results, it was suggested that selection of hatching egg weight might be effective for prevention of decreasing egg weight caused by replacement of generations of SPF chickens maintained as a closed flock.
- 日本家禽学会の論文
日本家禽学会 | 論文
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