Effect of posterior pituitary hormones on fertility in the domestic fowl Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/j6731675k

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  • An attempt was made to create a hormonal environment of the uterus comparable to that near the time of natural laying and to eliminate the effect of a hard-shelled egg on fertilization. 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. Subsequent fertility was reduced by the hormone injections but not to the extent observed when oviposition occurred naturally at various time intervals before or after insemination. Fertility was reduced significantly when 3 or 5 I. U. of oxytocin was injected immediately before insemination, only slightly when injected 30 minutes before and not at all when injected one, two or five hours before insemination. Fertility was reduced significantly when 5 I. U. of oxytocin was injected immediately or 30 minutes after insemination and slightly reduced when injected one or two hours after insemination. Also there was a tendency for fertility to be reduced when 3 I. U. of arginine vasopressin was injected immediately, 30 minutes or one hour after insemination but the reductions were not statistically significant. A combination of 2.5 I. U. of oxytocin and 1.5 I. U. of vasopressin injected immediately after insemination caused a greater reduction in fertility than 3 I. U. of vasopressin. A single intravenous injection of 5 I. U. of oxytocin one or two hours after insemination caused as much reduction in fertility as an intravenous injection of 3 I. U. preceded by two or three subcutaneous injections of 1 I. U. of oxytocin. Diluting semen with 2 I. U. of oxytocin per ml or with 0.125 mg of epinephrine per ml tended to reduce fertility but not significantly so. Subcutaneous injection of hens with 1 mg of epinephrine 20 minutes before insemination tended to increase fertility but did not counteract the adverse effects of oxytocin. Also intravenous injections of 0.5 mg of epinephrine or the addition of 0.125 mg of epinephrine per ml of semen did not overcome the reduction in fertility related to oviposition shortly after the time of insemination. Egg production was significantly reduced by subcutaneous injections of epinephrine but was not affected by intravenous injections of epinephrine. Intravenous injection of male chickens with 0.05 to 5 I. U. of oxytocin shortly before manual ejaculation tended to decrease semen volume, and increase concentration of sperm but did not significantly affect the total number of sperm per ejaculate. Oxytocin injections had no effect on the fertilizing capacity of the semen or the hatchability of the fertile eggs.
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