Effect of post-insemination supplementation with PRID on pregnancy in repeat-breeder Holstein cows.

Embryonic mortality contributes to repeat-breeding in dairy cows; luteal insufficiency is a known cause of embryonic mortality. The objective of this study was to assess the efficacy of supplementation with exogenous progesterone for 14 days on pregnancy maintenance in inseminated repeat-breeder dairy cows. On Day 5 after insemination, treated cows ( n=143 ) received a modified PRID (i.