Effects of Post-insemination Progesterone Supplementation on Pregnancy in Repeat-breeder Lactating Dairy Cows
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Abstract
The aim of this study was to determine the effect of post-insemination supplementation with using plaster synthetic progesterone (P-Sync) on pregnancy in repeat-breeder lactating dairy cows. Experiment was divided into 2 groups. Group 1 cows did not receive progesterone (P-Sync) after artificial insemination (AI) (n = 27). Group 2 cows received progesterone (P-Sync) after AI (n = 23). After that, record milk yields and lactation number all of repeat - breeder lactating dairy cows and pregnancy was diagnosed at 60 days after AI with ultrasound. The result found that cows at first lactation with progesterone (P-Sync) supplementation after AI had the highly pregnancy (risk ratio, i.e., RR = 5.00) (95 % CI = 0.767, 32.574) (P < 0.05). Effect of supplemented progesterone after AI on repeat-breeder lactating dairy cows shown that among cows with days in milk (191 - 400) in combination with progesterone supplementation after AI tended to be the highly pregnancy (risk ratio, i.e. RR = 3.14) (95 % CI = 0.769, 12.850) (P = 0.10). The results of this study demonstrate that the group of repeat-breeder lactating dairy cows with first lactation with progesterone supplementation after AI can increase the pregnancy rate per AI.
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