Abstract
Summary
Ovulation of the normally growing follicle of the hen's ovary can be induced by as much as 17 hours prior to time of expected normal ovulation by intravenous injection of appropriate hormones. A luteinizing preparation from horse anterior pituitaries effected ovulation of follicles 10 to 11 hours prior to time of normally expected ovulation in 100% of injected hens at a level of 4 rat units (Fevold rat seminal vesicle test). The commercial preparations Prephysin, Gonadin serum and Anteron were effective when administered at sufficiently high levels. At appropriate submaximal injection levels the percentage of ovulating hens decreased with increasing prematurity of the ovarian follicles; this effect is more pronounced in follicles of relatively great prematurity at the time of effect of the injected hormone.
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