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作者:H Archbold , F Buckley ...
来源:[J].Reproduction in Domestic Animals(IF 1.392), 2012, Vol.47 (3), pp.407-411
摘要:Contents(#br)Data were available from 1657 heifers across 48 dairy farms which were visited once, on average 9 days (±5.2) prior to the mating start date (23 April, ±12.6). Blood samples were collected via coccygeal venepuncture for progesterone (P4) analysis, and animals we...

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