2016, Number 1
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Vet Mex 2016; 3 (1)
Ovulation rate, prolificacy and pregnancy rate in goats treated with oral glycerol
Aguilar U, Hernández-Cerón J, Domínguez Y, Gutiérrez C
Language: English/Spanish
References: 25
Page: 1-10
PDF size: 1056.28 Kb.
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.
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