Studies on the Elimination of Broodiness in Domestic Fowl by the Use of Prolactin (II)
1953 Volume 1 Issue 3 Pages 83-85
Details
1953 Volume 1 Issue 3 Pages 83-85
This is the report on the broodiness in F1 and F2 chicks of the Plymouth Rock fowl observed in 1953. The broodiness in the cocks was determined by their reaction to Prolactin injections (Yamashina 1952a); that of the hens by the usual trap-nest method.
1. The three F1 females hatched in May 1951 from the cross between a broody cock and a slightly broody hen, all showed broodiness in 1952, but in 1953 only one did and the other two did not.
2. Five F1 females hatched in May, 1951 and nine F1 females hatched in March and April, 1952, all produced from the crosses between non-broody male and slightly-broody females, showed no broodiness in 1953.
3. Four F1 females hatched in May 1951 and five F1 females hatched in March and April, 1952, produced from the crosses between non-broody male and non-broody females, showed no broodiness in 1953.
4. Nine F2 females hatched in March and April, 1952 from the crosses between F1 female and F1 male, both produced from the crosses between non-broody male and non-broody females, showed no broodiness in 1953.
