Abstract
This study tested whether the oral administration of glycerol at the time of progestin removal and in the first 6 days of the estrous cycle increased the ovulation rate, prolificacy, and pregnancy rate in goats. Intravaginal sponges impregnated with fluorogestone acetate were inserted into 129 goats for 12 days; upon sponge removal, goats were randomly assigned to one of the two following treatment groups: the glycerol group (n = 65), which received an oral drench of 100 mL of glycerol upon sponge removal and was repeated on days 0, 2, 4, and 6 following estrus (estrus = day 0), and the control group (n = 64), which did not receive glycerol. The goats in estrus were mated, and their ovulation rate was determined by ultrasonography between days 8 and 12 of the estrous cycle. Pregnancy was diagnosed by ultrasonography on day 40, and the prolificacy was determined at birth. In 6 goats treated with glycerol and 5 controls, their insulin concentrations at 0, 2, 4, 8, and 12 h after the glycerol drench were determined by radioimmunoassay. The proportion of goats with multiple ovulations (glycerol = 71 vs control = 64) and the proportion of goats with multiple births (glycerol = 52 vs control = 56) were similar (P > 0.05) between treatments. Likewise, the pregnancy rate was similar (P > 0.05) between treatments (glycerol = 88 vs control = 85%). The insulin concentrations tended to be higher in goats treated with glycerol (P = 0.08). In conclusion, an oral drench of 100 mL of glycerol at the time of progestin withdrawal and in the first 6 days of the estrous cycle did not increase the ovulation rate, prolificacy, or pregnancy rate in goats.
Highlights
Tasa de ovulación, prolificidad y tasa de gestación en cabras tratadas con glicerol por vía oral
Al retirar la esponja se aplicó una dosis luteolítica de cloprostenol sódico (Celosil; msd Salud Animal, México) y las cabras se asignaron al azar a dos tratamientos: en el grupo de glicerol (n = 65), los animales recibieron por vía oral 100 mL de una solución a base de glicerol y agua (90:10 v/v), la cual se repitió los días 0, 2, 4 y 6 post-estro, y las cabras en el grupo testigo (n = 64) no recibieron glicerol
Intermittent nutritional stimulus by short-term treatment of high-energy diet promotes ovarian performance together with increases in blood levels of glucose and insulin in cyclic goats
Summary
Publicación Digital de la Facultad de Medicina Veterinaria y Zootecnia http://veterinariamexico.unam.mx oa Artículo Científico. Prolificidad y tasa de gestación en cabras tratadas con glicerol por vía oral. Se probó si la administración oral de glicerol, al momento de retirar el progestágeno y durante los primeros seis días del ciclo estral, incrementaba la tasa de ovulación, la prolificidad y la tasa de gestación en cabras. Entre los días 8 y 12 del ciclo estral, se determinó la tasa de ovulación mediante ecografía. La tasa de gestación fue igual (P > 0.05) entre los tratamientos (glicerol = 88 vs testigo = 85%). Se concluye que la administración oral de 100 mL de glicerol al momento de retirar el progestágeno y durante los primeros seis días del ciclo estral, no incrementó la tasa de ovulación, la prolificidad, ni la tasa de gestación en cabras. Aunque aún no se comprende completamente el mecanismo de acción del flushing, las evidencias indican que sus efectos se producen a nivel ovárico, son independientes de las concentraciones de gonadotropinas y se relacionan con un incremento en los nihttp://veterinariamexico.unam.mx
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