Efecto de la somatotropina en diferentes niveles sobre la calidad y cantidad de estructuras colectadas en vacas Brahman Superovuladas a tiempo fijo en el cantón Bucay provincia de Guayas.

Abstract

The research has develop a study of the effect of somatotropin at different levels on the quality and quantity of structures collected in Brahman cows super ovulated at a fixed time in the canton of Bucay, province of Guayas. The general objective of the present study was to determine the effect of somatotropin on the quality and quantity of viable structures in the superovulation process in Brahman cows. The research was carried out on a cattle ranch in canton of Bucay, Guayas province, located on the south coast of the country. Twelve Brahman cows aged between 36 and 48 months were used in the research, distributed in four treatments and three repetitions. The consequences of supplying recombinant somatotropin (rBST) at different doses (500 mg, 1000 mg, 1500 mg and control) in super ovulated cows were analyzed. The results obtained concerning the length of the right and left ovaries in Brahman cattle showed a higher value in the right ovaries in the T2 treatment (1000 mg of rBST) with 33.80 mm for the right ovary and 32.33 mm for the left ovary. 33 mm for the left one. When evaluating the width of the ovaries it was determined that the application of 1500 mg rBST at T3 positively influenced the development of the width 21.27 mm for the right one and 23.78 mm for the left one in contrast to the control group T0 without rBST 15.72 mm right and 14.57 mm left. The number of corpora lutea at T2 (1000 mg rBST) was 10 on average and for the control group T0 without rBST it was 7. These results are verified with those of the research carried out by Alvarado (2012), in which he determined 15.97 with the application of rBST and 15.60 without rBST, thus demonstrating that rBST does not influence the development of pre-ovulatory follicles. On the other hand, the application of 1000 mg rBST at T2 generated a numerical increase in the collected structures reaching 9, this difference does not represent a higher statistical value in reference to other treatments. In general terms, no consequences of the application of rBST in the treatments were observed, however, the application of 1000 mg of rBST in T2 presented a better behavior in all the variables analyzed.