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A Comparison of the Ovulation Rate, Fertilization Rate and Embryo Survival of Hand-Mated and Lot-Mated Gilts

1968; Oxford University Press; Volume: 27; Issue: 2 Linguagem: Inglês

10.2527/jas1968.272443x

1544-7847

T. D. Rich, E. J. Turman, J. C. Hillier,

Reproductive Biology and Fertility

Data were obtained from 103 Yokshire gilts in six trials comparing the reproductive performance of lot-mated and hand-mated gilts. When methods of mating were pooled for trials, the ovulation rates of 16.5 and 16.3 for lot-mated and hand-mated gilts, respectively, were not significantly different. The hand-mated gilts exhibited a slight advantage (P<.10) in number of viable embryos and a significant (P<.05) advantage in percentage embryo survival. Pooled across the two trials in which fertilization data were collected, the fertilization rates were 89.7% and 92.4% for lot-mated and hand-mated gilts, respectively, this difference was nonsignificant. The over-all analysis of the data and examination of the usually large standard errors suggest that the differences seen are not real. However, the frequency of the differences in favor of hand-mating suggests the possible existence, within this sample of Yorkshire gilts, of a trend in favor of the hand mating technique. Additional research incorporating more animals, actual sizes of litters born and a measure of physiological stress would be desirable.