Influence of sexually inactive bucks subjected to long photoperiod or testosterone on the induction of estrus in anovulatory goats |
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| Authors: | Juan Ramón Luna-Orozco Juan Manuel Guillen-Mu?oz Ma de los Angeles De Santiago-Miramontes José Eduardo García Rafael Rodríguez-Martínez Cesar Alberto Meza-Herrera Miguel Mellado Francisco Gerardo Véliz |
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| Institution: | (1) Centro de Bachillerato Tecnol?gico Agropecuario, No. 1, Torre?n, Mexico;(2) Departamento de Ciencias Medico Veterinarias, Universidad Aut?noma Agraria Antonio Narro, Perif?rico Ra?l L?pez S?nchez y Carretera a Santa Fe, 27054 Torre?n, Mexico;(3) Universidad Aut?noma Chapingo, Unidad Regional Universitaria de Zonas ?ridas, Bermejillo, Durango, Mexico;(4) Departamento de Nutrici?n Animal, Universidad Aut?noma Agraria Antonio Narro, Saltillo, Mexico; |
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| Abstract: | The objective of this study was to evaluate the efficacy of treating sexually inactive bucks with artificial long photoperiod
or testosterone on the induction of estrus in anovulatory grazing goats. A total of 91 multiparous mixed-breed anestrous goats
were randomly assigned to one of three treatment groups: (1) joining with bucks subjected to 2.5 month of artificial long
days (16 h of light/day; n = 31), (2) joining with testosterone-treated bucks (n = 30), and (3) joining with untreated bucks (control; n = 30). There were no differences between the light-treated (100%) and testosterone-treated (93%) bucks in their ability to
induce estrus in anovulatory does. On the other hand, none of the goats in contact with control bucks exhibited estrus. The
interval from start of mating to estrus was shorter in goats with the light-treated bucks (37.9 ± 4.8 h) compared with does
in contact with testosterone-treated bucks (58.3 ± 8.7 h). The overall pregnancy rate in goats joined with light-treated,
testosterone-treated and control bucks was 84%, 77% and 0%, respectively, with no difference (P > 0.05) between the first two groups. Anogenital sniffing, approaches, mounting attempts, and mounts were highest (P < 0.01) in light-treated bucks and lowest in control bucks. It was concluded that testosterone-treated bucks and long-day-treated
bucks were equally effective in synchronizing estrus in anovulatory goats and resulted in similar levels of fertility. Given
that light-treated bucks are unviable in communal production systems of goats raised by resource-poor farmers, the sexual arousal of bucks with testosterone is a practical and reliable method to induce ovulation in anovulatory
goats in pastoral goat systems in hot environments. |
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