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Reproduction in the gilt part 3 the effect of exogenous estrogen on the attainment of puberty and subsequent reproductive performance



Reproduction in the gilt part 3 the effect of exogenous estrogen on the attainment of puberty and subsequent reproductive performance



Animal Production 27(1): 11-20



Ten Landrace .times. (Landrace .times. Large White) young female pigs were allocated to each of 4 treatments. The experiment was arranged as a 2 .times. 2 factorial design, the variables being estradiol benzoate vs. ethyl oleate and boar vs. visual testing. The estradiol benzoate (or ethyl oleate) was administered at 140 days of age, the treatment consisting of 6 injections, over a 3 day period, of 0.5 ml of either ethyl oleate or a solution of 0.4 mg/ml .beta.-estradiol-3-benzoate in ethyl oleate. Subsequently the gilts were either inspected visually each day or taken to a vasectomized boar for estrus detection. All gilts were mated at the 2nd estrous period, and slaughtered on the 20th day of gestation. Those gilts receiving exogenous estrogen attained puberty significantly earlier (P < 0.01) than the control gilts. Of the 20 gilts treated with estrogen, 12 (60%) attained puberty within 5 days of the start of treatment. No significant difference was found between boar testing and visual testing, although receptivity to mating appeared to be lower for visually tested gilts. There are no significant differences between treatments in ovulation rate, conception rate or embryo survival.

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Accession: 006315767

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