Abstract
Hens without hard-shelled eggs in their uteri were injected with the posterior pituitary hormones, oxytocin and arginine vasopressin, at various times before or after artificial insemination. The hormone injections caused a pattern of reduced fertility which resembled that observed when hens lay naturally at various times before or after artificial insemination. These results indicate that the posterior pituitary hormones involved in oviposition may be partially responsible for the reduced fertility associated with laying near the time of insemination.
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