Relación entre cinquemia y fertilidad en vacas lecheras mestizas Holstein x Cebú

In order to determine the correlation between the cinquemia and the reproductive indicators of the dairy cow and the concentrations of Zn in blood serum that constitute a significant risk for the presentation of the postpartum anestrus and the repetition on service of Artificial Insemination, 143 animals with six to eight elderly years and third and fourth lactation were selected. The correlation between the cinquemia and the reproductive indicators and the association between different concentrations of Zn in blood serum and the anestrus and the repetition on service of Artificial Insemination were determined. The herds present low reproductive efficiency and the cinquemia had a negative correlation (p= 0.0000) with the postpartum anestrus and the interval parturition. For the postpartum anestrus when the lower cinquemia than 15 μmol/L, constituted a relative risk (RR) 1. 74 (p= 0. 0070) and lower than 14 μmol/L, RR 2.69 (p= 0. 0000) and lower to 16 μmol/L was not, RR 1.04 (p= 0.8282). For the repetition of service of Artificial Insemination, the lower cinquemia to 15 μmol/L constituted a relative risk (RR) factor, RR 3.83 (p= 0.0000), lower to 14 μmol/L, RR 5.20 (p= 0.0000) and was not when its concentrations were under 16 μmol/L, RR 1.77 (p= 0.119. It is concluded that that the cinquemia had a negative and highly significant correlation with the reproductive indicators and when it descends from 15 μmol/L it constitutes a significant relative risk to the presentation of anestrous and repetition of service of Artificial Insemination.