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There appeared 1- to 2-month-old pullets having abnormally large comb which was comparable to that of the cockerels at corresponding ages in White Leghorns. Comb size expressed as the projected area was significantly greater in a large comb gronp than a normal comb group from 42 to 84 days of age, but smaller after 112 days of age Plasma LH levels of pullets having large comb were lower than the pullets having normal size comb until 140 days of age, but higher at 154 days of age. Plasma LH was always higher in cockerels than pullets. Plasma testosterone levels were significantly (p<0.05) higher in the pullets having large comb than in the pullets having normal size comb from 42 to 82 days of age, but lower after 112 days of age. In the cockerels plasma testosterone levels increased rapidly between 56 and 78 days of age and remained at high levels until 140 days of age, temporally dropped at 154 days of age and increased again thereafter. Plasma estradiol levels were similar in pullets having large comb and those having normal size comb except 42 days of age when the value in the former was higher than the latter. The levels of cockerels were always low during the experimental period (42-196 days of age). Plasma progesterone levels were higher in the pullets having large comb than in the pullets having normal size comb from 42 to 98 days of age, but were lower after 112 days of age. The value in the cockerels was similar to the pullets until 140 days of age, and decreased thereafter while the level increased in the pullets. Pullets having large comb started egg production seuen days later (166 days of age) than those having normal size comb, but no statistically significant difference was observed in the egg production rate between the two groups of pullets.Abnormally larger combs of pullets observed in a White Leghorn gronp at 1-2 months of age are induced by a higher amount of testosterone secreted from ovary of the group than that of the other group of the same age.
- 日本家禽学会の論文
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