Maintaining contact with bucks does not induce refractoriness to the male effect in seasonally anestrous female goats.
A study was performed to determine if complete separation between sexes is a pre-requisite to stimulate sexual activity of anovulatory female goats by male exposure in mid-anestrus when reproductive activity is greatly inhibited. The response to the male was studied in anovulatory goats which had either been in contact with bucks before the stimulation (n = 22; CONT), or totally isolated from bucks (n = 22; ISOL). At the time of male exposure, the bucks from the CONT groups were removed and females of both groups (CONT and ISOL) were divided into two subgroups (n = 11) exposed to novel bucks (n = 1 per subgroup), either in sexual rest (sexually inactive; SI) or in which sexual activity had been induced by a photoperiodic treatment (sexually active; SA). The sexual behavior of the SA bucks during the first 5 days of stimulation was greater than that of SI bucks (P < 0.01). Regardless of whether females had been (82%) or not (91%) exposed to bucks before teasing, most goats stimulated by SA males displayed estrous behavior and ovulation in the first 15 days following stimulation, whereas no female from the two subgroups exposed to SI bucks showed estrous behavior and only one of them ovulated (P < 0.02). These results indicate that previous isolation of seasonally anovulatory goats from bucks is not required to stimulate their reproductive activity by the male effect, if sexually active bucks are used.
Véliz
F G
FG
Centro de Investigación en Reproducción Caprina, Departamento de Ciencias Médico Veterinarias, Universidad Autónoma Agraria Antonio Narro, Carretera a Santa Fe y Periférico A.P. 940, Torreón, Coahuila, México.
Poindron
P
P
Malpaux
B
B
Delgadillo
J A
JA
D000780:Anestrus / Q000502:physiology*; D000818:Animals; D004971:Estrus / Q000502:physiology*; D005260:Female; D006041:Goats / Q000502:physiology*; D008297:Male; D010060:Ovulation / Q000502:physiology; D011897:Random Allocation; D012621:Seasons; D012726:Sexual Behavior, Animal / Q000502:physiology*