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Effects of Periparturient Disease on Postpartum Reproduction in Dairy Cattle

Michigan State University, East Lansing 48823

Abstract

The effects of periparturient disease on postpartum reproduction and breeding efficiency were studied in 50 cows during 123 lactations over a 3-year period. The cows with periparturient diseases were 7.7 months older and produced 490 kg more milk than those with normal parturitions (P<0.05). The first ovulation occurred at 18.0 days postpartum in normal cows and at 42.0 days in abnormal cows (P<0.01). The interval from first to second ovulation was 17.7 days in normal cows and 21.9 days in abnormal cows (P<0.01). The interval from second to third ovulation was approximately normal in both groups. There was no significant difference in the occurrence of standing estrus between normal and abnormal cows (P>0.05).

Normal corpora lutea occurred during 61% of the 314 cycles, cystic corpora lutea during 17% and cystic follicles during 22%. There were significantly more corpora lutea in normal than in abnormal cows (P<0.05). The differences in the occurrence of cystic corpora lutea and cystic follicles were not significant (P<0.05). The cows with periparturient disease had a 22-day longer calving interval and required 0.6 more services for each conception (P<0.05).

¹ Department of Large Animal Surgery and Medicine College of Veterinary Medicine.

² This study was supported in part by RMA contract No. 12-14-100-7727 (44) with the A.R.S., U.S.D.A.