Evaluación de la dinámica folicular mediante ultrasonografía en hembras bovinas utilizando dos variantes de minerales inyectables comerciales

Abstract

Follicular dynamics is evaluated by ultrasonography in bovine females using two commercial injectable mineral variants on the San Diego farm in the Chimborazo Province, Riobamba canton, Maldonado parish, Medio Mundo neighborhood. We worked under a completely randomized design with 24 experimental units divided into three treatments of 8 repetitions each; where T0 was the control group, T1: application of 20 ml of injectable mineral 1 and T2: application of injectable mineral 2; applied on three alternate days for two weeks, during the first hours. The results obtained in body condition showed statistically significant differences P≤0.05 between treatments, with T2 being the best average with 2.89 ± 0.11 points. The presence of a corpus luteum was in 38% of the animals in both T1 and T2, while T0 presented a corpus luteum in 25% of cows. Regarding to the number of follicles, statistically significant differences P≤0.05 were obtained between the means, resulting in T1 with a higher follicular count in both the left ovary (8.5 ± 0.75 follicles) and the right (9 ± 0. 27 follicles). There were statistical differences at a significance p ≤ 0.05 in size of the ovaries where T1 reports the mean with the largest size in the left ovary (31.25 ± 1.03 mm) and right ovary (31.25 ± 1.03 mm). Regarding to the size of the preovulatory follicle, the mean differences were at p ≤ 0.05 of significance, observing that the best result was T1 with a mean of 18.25 ± 1.67 mm. The costs indicate that, between the two experimental treatments with commercial injectable minerals, the one with the lowest cost per treatment was T1 at a rate of $224.57. To sum up, the applied minerals have a positive effect on the follicular dynamics of mixed-race females.