Ovulation in the boer goat doe

Greyling J.P.C. ; van Niekerk C.H. (1990)


A total of 40 Boer goat does were slaughtered 26 (n = 15), 32 (n = 10) or 38 (n = 15) h after onset of oestrus. Blood was sampled from eight does in each group for serum progesterone and LH concentration determinations from the time of onset of oestrus to slaughter. Follicular activity (follicles greater than 0.2 cm) in the ovary increased significantly (P < 0.05) as time following onset of oestrus increased from 26 to 38 h (8.2-13.1). 86.7% of the does had ovulated by 38 h after onset of oestrus. Mean ovulation rate for all does was 1.72 ± 0.91 ovulations per doe, showing the Boer goat to be a prolific breed. Mean interval from onset of oestrus to the pre-ovulatory LH peak was 11.3 ± 4.3; 13.1 ± 3.0 and 10.5 ± 4.1 h for the groups slaughtered at 26, 32 and 38 h, respectively. The interval between the LH peak and ovulation was relatively constant at 24.7 h for all does. Knowledge of the time of onset of the LH peak permits approximate predictions regarding the time of ovulation. © 1990.

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