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Reproduction in Sheep
From ANS 316 Species 1 Lecture
4
Veterinary Medicine
Undergraduate 3
06/07/2013

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Cards

Term
Breeding season
Definition
  • Geographical and breed dependent
  • Breeds developed in regions which extreme seasonal changes in photoperiod were absent having less well-defined breeding seasons than breeds developed in temperate regions with sharp seasonla differences (opposite of expected)
Term
Estrus
Definition
  • Least noticible
  • Vulva swells and reddens and mucous discharge may be present
  • Only real behavioral sign is standing to be mounted by the ram
Term
Silent Heats
Definition
  • Ovulation without estrus occurs frequently at the onset and end of breeding season
  • Estrous cycle lengths also tend to be shorter at these times
Term
Postpartum anestrus
Definition
  • Lactationally influenced, like the cow
  • Not very obseravable because most ewes lamb during nonbreeding season
  • for ewes lambing during the breeding season, or ewes with less defined breeding seasons, a period of lactationally influenced anestrus can be observed for 4-6 weeks postpartum
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