Efecto de un suplemento energético sobre los parámetros reproductivos en vacas lecheras

Abstract

The purpose of this study was to evaluate the effect of an energy supplement on reproductive parameters in dairy cows. For this purpose, 24 experimental units were used (12 third calving cows and 12 fourth calving cows), which were given different levels of energy supplement (0, 20, 40 and 60 g/day) for 60 days. Reproductive variables such as corpus luteum size (mm), corpus luteum blood supply (%) and ovarian size (mm) were determined by transrectal ultrasound. These measurements were taken at an interval of 15 days until day 60. In addition, blood progesterone levels were determined by blood analysis of animals in the different treatments. For the analysis and interpretation of the data, the Student's T-test was used, where it was determined that the females fed 20 g/day showed a better response in the size and irrigation of the corpus luteum, as well as in the size of the ovaries. The analysis of the results showed that females fed 20 g/day showed a better response in the size and irrigation of the corpus luteum, as well as in the size of the ovaries. In addition, it was observed that third calving cows responded better to different supplementation levels observing significant statistical differences in ovarian size, size and irrigation of the corpus luteum, as well as in ovarian size, size and blood supply to the corpus luteum. It is concluded that the best level of supplementation was 20 g/day and that the group that obtained the best response was the third calving females; recommending the use of this product at these doses under the conditions of the present study.