Vocalizations of male goats do not stimulate neither LH secretipn nor ovulation on anovulatory female goats.

摘要

The objective of this study was to determine if the reproduction of goat buck vocalizations stimulated the secretion of LH and ovulation of anoestrus female goats. 40 multiparous Creole goats, isolated from male goats 3 months before the onset of experiment, were allocated to 4 groups (n=10 each). The first group was exposed to one sexually active male. The second group was exposed to vocalizations of males reproduced by compact discs. The third group was exposed to the blank noise produced by a virgin compact disc. The females of the fourth group remained isolated. LH was measured 4 h before and 4 h after the onset of stimulus, whereas progesterone was determined during the next 28 days. The introduction of the male in the corresponding group increased (P<0.05) LH pulses from 1.0+or-0.2 to 2.9+or-0.3. On the contrary, no change (P>0.05) in LH pulsatile secretion was observed in vocalization (before 1.0+or-0.1; after 0.8+or-0.2), blank noise (before 1.0+or-0.1; after 0.8+or-0.1) or isolated (before 0.6+or-0.2; after 1.1+or-0.2) groups. All does in the first treatment (exposed to buck) ovulated, whereas none in the other 3 groups did. These results showed that in anovulatory does, reproduction of buck vocalizations recorded during sexual courtship did not stimulate either frequency of LH pulses or ovulation.