プロラクチンを利用する家鷄就巣性除去の研究(IV)
ロックホーンの実験
1955 年 1 巻 7 号 p. 271-276
詳細
1955 年 1 巻 7 号 p. 271-276
Broodiness of F1 hybrids, produced by the crosses, White Leghorn _??__??_×Barred Plymouth Rock _??__??_ was examined. The Plymouth Rock hens used were those of non-broody strain which was obtained by prolactin-experiment.
All of the 29 hybrid hens obtained from the crosses in which non-broody White Leghorn Cocks were used, were non-broody.
The above is perhaps the result of the perfectness of broodiness-elimination in the maternal line.
Average days from birth to the laying of first egg in these hybrids, and the average number of eggs laid by them during the 1st year, are as follows:
