A note on the lack of difference in fertility between old and young hens when inseminated with frozen semen.

Semen was frozen (in glycerol) from 24 males (9 months of age) of a commercial broiler line and was inseminated intravaginally into old (19 months of age) and young (7 months of age) commercial Leghorn females. Duration of fertility, percent fertility during duration and percent hens fertile were measured. The means for old and young hens respectively, were: duration of fertility (1.4 +/- 0.4 and 1.6 +/- 0.5 days), percent fertility (19.1 +/- 5.1 and 15.9 +/- 5.1) and percent hens fertile (29.2 +/- 7.7 and 25.3 +/- 7.2). The "t" test revealed no significant (P greater than 0.05) differences between old and young females in fertility.