Incremento de la capacidad reproductiva de vacas en etapa post parto con la adicion a la dieta de diferrentes niveles de seleniato de sodio.

Abstract

This research is about increasing the reproductive capacity of cows in the postpartum stage with the addition to the diet of different levels of selenate sodium It was carried out in the facilities of the ¨Don Carlos¨ farm of the Mocha canton, Tungurahua province. Using 16 experimental units that were selected within the group of postpartum cows from the ranch. To model the results, it was used a completely randomized design with 3 treatments more with a control group and 4 repetitions for each one, the statistical analyzes were ADEVA, comparison of means by Tukey and percentages. The results indicate that many factors affect the mineral requirements of ruminants, age, supplemental mineral intake, race and animal adaptation. Selenate sodium supplementation has a significant influence in the reduction of open days of the cows, since with the application of higher levels, records the least number of days open (50 - 51 days) as well as the least presence of residues placental (25%). When evaluating the reproductive parameters, the variables that indicate more problems are determined by the number of services per conception, placental waste and days open, which are lower by including higher levels of selenate sodium (1.2%), positively affecting the reproductive efficiency of the herd. A livestock company that does not have the capacity to manage and positively modifying reproductive parameters and indices will always have a economic negative balance, considering that the interval between delivery and conception is decisive in a exploitation that aims to be successful and profitable, which is achieved by using higher levels of selenate sodium (1.16%). Therefore, it is recommended to use 1.2% of selenate to achieve a higher reproductive efficiency of postpartum cows.