publication . Thesis . 1987

Effects of breed and ram exposure on Spring estrous behavior and Summer fertility in domestic ewes

Nugent, Russell A., III;
Open Access
  • Published: 25 Apr 1987
  • Publisher: Virginia Tech
  • Country: United States
Abstract
The present studies were conducted to check the effects of acute ram introduction into a flock of anestrus ewes in Virginia. Ewes were bled via jugular venipuncture twice weekly and serum samples were radioimmunoassayed for progesterone (P4) content as an indicator of estrous activity. All rams were fitted with crayon equipped marking harnesses for use as an indicator of mating behavior in ewes. The first study tested the effects of introduction of vasectomized rams into a flock: of' 50 Dorset (D) and 50 Hampshire (H) purebred ewes in either May or June. More D ewes ovulated (96% vs 72% for H ewes) and mated (80% vs 20% for H ewes) in May. Of ewes which mated in...
Subjects
free text keywords: Sheep, LD5655.V855 1987.N83
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Thesis . 1987
Provider: VTechWorks
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