publication . Doctoral thesis . 2008

Characterization of seasonal reproduction in Virginia Tech Selection Line, St. Croix, and Suffolk ewes

Jordan, Katherine Mead;
Open Access
  • Published: 04 Aug 2008
  • Publisher: Virginia Tech
  • Country: United States
Abstract
This dissertation research contained three studies. The first two studies were conducted to investigate the ability of ewes to rebreed while lactating during seasonal anestrus. Breeds studied included the Virginia Tech Out-of-season (OOS) Line, which is a wool line genetically selected to lamb in the fall, and the St. Croix, a hair breed of tropical origin thought to be lowly seasonal. When January-lambing ewes were exposed to rams while lactating in April, significantly more OOS than St. Croix ewes were marked by rams in the first 21 d and total 39 d of ram exposure (58.3 vs. 8.7%, P = 0.0003 and 95.8 vs. 43.5%, P < 0.0001). Percentages of ewes diagnosed pregna...
Subjects
free text keywords: sheep, season, lactation, fertility, endocrinology
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Doctoral thesis . 2008
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