INFLUÊNCIA DA CONTAGEM DE CÉLULAS SOMÁTICAS (CCS), SOBRE A EFICIÊNCIA REPRODUTIVA E EFEITO DA PRODUÇÃO DE LEITE, ESCORE DE CONDIÇÃO CORPORAL, ORDEM DE PARTO E SAÚDE DAS VACAS DE RAÇA HOLANDÊS SOBRE A TAXA DE CONCEPÇÃO

Abstract

The objective was to evaluate the influence of somatic cell count (SCC) on reproductive efficiency and analyze the effect of production, body condition score (BCS), order of birth and health of dairy cows on the conception rate 60 days after the first postpartum insemination. We used 280 Holstein cows in lactation, housed in a free stall barn, which were grouped according to somatic cell counts, with Group 1 (n = 295) with CCS ≥ 250,000 cs / ml and Group 2 (n = 54 ) ≤ with CCS to 250,000 cs / ml. For comparison the conception rate we used the Chi-square test and the comparison of milk production, days open and SCC between groups, we used the F test. To evaluate the effect of rectal temperature, production, CCS, ECC, order of birth and health of the cows on the pregnancy rate at 60 days was used logistic regression. There was no difference between the groups in any of the reproductive efficiency parameters. fourth lactating animals have higher risk of pregnancy 60 days after insemination and the first cows that had retained placenta showed less chance of pregnancy.