Abstract

SUAREZ, VH  and  MARTINEZ, GM. Consecuencias reproductivas y sanitarias de los abortos bovinos en la cuenca lechera del Valle de Lerma, Salta, Argentina. FAVE, Secc. Cienc. vet. [online]. 2021, vol.20, n.2, pp.68-76. ISSN 2362-5589.  http://dx.doi.org/https://doi.org/10.14409/favecv.v20i2.10642.

In order to investigate the effects of bovine abortions in the dairy basin of Valle de Lerma records of 128 Holstein milking cows from the software of 4 dairy farms were studied. The abortions were classified into: aborted cows re-inseminated that continue in lactation (VAC, n = 36) and aborted cow that started a new lactation (VAI, n = 33) and were added the records of: cows with normal parturitions (NPV, n = 59). Milk litters accumulated at 305 lactation days (L / 305), days in lactation (DEL), the intervals between calvings (IPP), number of post-abortion health disorders and number of cows that continues, culled, death or slaughtered were recorded. Continuous variables were subjected to analysis of variance with a mixed linear model and the discrete ones to Chi square test and Odds Ratio (OR). No differences were found between the milk litters production (L / 305) of NPV (8640) and VAC (8498) cows but there were differences (p <0.0001) between those groups and the VAI group (5742) considering the cows of different number of lactations and gestational time to abortion. The VAC group had DEL (p <0.0001) and PPI (p <0.0001) respectively longer (639.7 and 441.2 d.) than those of VAI (419.9 and 404.2 d.) and NPV (405.5 e 476.7 d.) cows. Aborted cows (VAC + VAI) had a higher (p <0.0001) probability of contracting, respectively reproductive health disorders (OR= 6.5, CI 3.2 - 24.3) and culls plus deaths / slaughters (OR = 6.72, CI 2.9-15.1) than those of NPV. These results show the serious effects of abortions on milk production, reproductive performance and health of dairy cows.

Keywords : abortion; dairy cattle; herd health; Argentina.