Incidência da retenção de placenta e as consequências na produção de leite e na eficiência reprodutiva de vacas holandesas

Abstract

This study aimed to evaluate the incidence of retained placenta (RP) and the influence of this disease on productive and reproductive efficiency of Holstein dairy cows. The presence of RP were considered as non elimination of placenta until 12 hours after fetal expulsion. The data of parity, occurrence of RP, calving to conception interval and milk production were collected from a commercial farm and subsequently analyzed by logistic regression and analysis of variance at SAS program. The incidence of RP was 13.75% (40/291). The incidence of RP was not affected by parity order nor the season of the last calving, and these variables did not affect the milk production adjusted to 305 days of lactation. The parity, season of calving and the occurrence of RP significantly influenced the duration of calving to conception interval, the duration of this interval was greater for females with three or more lactations, for females with RP and for females that have calved during the summer. The RP does not affect milk production, but it has a deleterious effect on reproductive performance of Holstein cows.