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. e. without estradiol capsule), which was removed on Day 19. Control cows (n = 148) did not receive any treatment. Overall there was no effect of PRID® supplementation on pregnancy rates. However, when the study population was stratified by parity and stage of lactation, PRID® supplementation significantly improved pregnancy rate in first and second parity late lactation cows (risk ratio = 3.26; 95% CI 1.22, 8.69). Pregnancy rates did not differ between PRID®-treated cows with (n = 81) and without vaginitis. Control cows tended (p = 0.077) to have a higher proportion of abortions than PRID®-treated cows (7/50 versus 2/51, respectively). In conclusion, young late lactation repeat-breeder cows benefited from progesterone supplementation, in terms of maintaining pregnancy until traditional time of pregnancy diagnosis.
|Translated title of the contribution||Effect of post-insemination supplementation with PRID® on pregnancy in repeat-breeder Holstein cows|
|Number of pages||7|
|State||Published - Dec 1 2006|
- Dairy cattle
- Progesterone supplementation
ASJC Scopus subject areas