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The reproductive performance of cows with post parturient metritis treated systemically with long-acting oxytetracycline was compared with normal herd mates in four South African dairy herds. The incidence of metritis for all calvings in theseh erds was7.57a( of 1838 calvings),3.67o( of 715 calvings),4.67o( of 455 calvings) and2.8Vo( of 357 calvings), respectively. The comparative median days to first insemination and conception between normal and metritic casesi n the largesth erd were 75 versus8 5 and 92 versus1 40, respectively.O n average,m ore inseminations per conception (2.06) were needed for metritic cases when compared with normal herd mates (1.52) in this herd. These differences were statistically significant (P < 0.01).No significant differences in these parameters were apparent between metritic cases and normal herd mates in the other three herds. Die vrugbaarheidsprestasiev an koeie met post partale metritis wat sistemiesm et langwerkende oksitetrasiklien behandel is, is met normale kuddemaats in vier Suid-Afrikaanse melkkuddes vergelyk. Die insidens van metritis vir alle kalwings was onderskeidellk,T.5V(au it 1838k alwings),3.67o( uit 715 kalwings),4.6Vo( uit455 kalwings) en 2.87o (uit 357 kalwings). Die mediane dag tot eerste inseminasie en konsepsie tussen normale en metritis gevalle in die grootste kudde was onderskeidelik, 75 versus 85 en 92 versus 140 dae. Gevalle van metritis in hierdie kudde het gemiddeld meer inseminasies per konsepsie (2.06) benodig as normale kuddemaats (1.52). Hierdie verskille was statisties betekenisvol (P < 0.01). In die ander drie kuddes was daar geen betekenisvolle verskille tussen metritis gevalle en normale kuddemaats ten opsigte van hierdie parameters nie. Keywords : Dairy herds, metritis,m ultifactorial,r eproductivep erformance.

A comparative observational study on the reproductive performance of dairy cows with metritis and normal cows