Reproductive response of Pelibuey sheep to the application of recombinant bovine somatotropin and a metabolic restorative preparation

Abstract

The objective of this work was to evaluate the effect of recombinant bovine somatotropin (rBST) and of the metabolic restorative preparation Metabolase (MR) on the reestablishment of the post-partum ovarian activity of Pelibuey sheep. Ninety-four ewes, with their respective lambs, were randomly assigned to one of the following treatments: T1, continuous suckling (CS); T2, CS + MR; T3, CS + rBST; and T4, CS + MR + rBST. Ovulating percentages, weight changes in ewes and lambs, incidence of estrus, onset and return to estrus, calving, fecundity, and prolificacy were evaluated. The highest ovulation percentages were recorded for CS in T1 and T2, and the lowest ones for rBST in T3 and T4. The treatments had a significant effect on lamb weight. Ewes in T3 had the lowest incidence of estrus (52.9%), besides a greater onset (26.8±1.9 hours) and return to estrus (66.6%). Calving (86.2%) and fecundity (1.8±0.2) were significantly higher in T2. The application of rBST in ewes increases lamb body weight, due to increased milk production, but affects negatively post-partum reproductive activity due to the loss of ewe body weight.

The Postgraduate Course in Tropical Agroecosystems: Facing the Challenges for Mexican Agriculture in the 21st Century

“…The contributions propose an increase in animal, forestry and crop productivity. The livestock part does research on ovines, bovines, birds, bees and rabbits, byproducts thereof and factors that limit production (Arce et al, 2017;Dominguez et al, 2015;Fraire et al, 2018a;Fraire et al, 2018b;González et al, 2016;Herman et al, 2019;Hernández et al, 2016;Huerta et al, 2018;Ramírez et al, 2018a;Ramírez et al, 2018b;Ramírez et al, 2017a;Ramírez et al, 2017b;Ramírez et al, 2017c;Rivera et al, 2016;Rodríguez et al, 2017;Romero et al, 2018;Rosales et al, 2018;Sosa et al, 2014;Yáñez et al, 2018). Within the factors that limit or improve the production, sociocultural, technological and productive aspects that suggest fostering the use of technology to improve productive indexes are identified (Juárez et al, 2015;Maldonado et al;Purroy et al, 2015).…”