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The low fertility of repeat-breeder cows during summer heat stress is related to a low oocyte competence to develop into blastocysts

25 Apr 2011

Abstract excerpt

It was hypothesized the lower fertility of repeat-breeder (RB) Holstein cows is associated with oocyte quality and this negative effect is enhanced during summer heat stress (HS). During the summer and the winter, heifers (H; n=36 and 34, respectively), peak-lactation (PL; n=37 and 32, respectively), and RB (n=36 and 31, respectively) Holstein cows were subjected to ovum retrieval to assess oocyte recovery, in...

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PMID: 21524528
DOI: 10.3168/jds.2010-3904

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