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Animal Reproduction and Physiology
Asian-Australasian Journal of Animal Sciences 2000;13(1): 6-9.
https://doi.org/10.5713/ajas.2000.6    Published online January 1, 2000.
Effects of Sperm Number and Semen Type on Sow Reproductive Performance in Subtropical Area
Y. H. Kuo, S. Y. Huang, K. H. Lee
The purpose of this study was to evaluate the effect of lower numbers of sperm (3횞109) per dose liquid semen and type of semen used in artificial insemination (AI) on sow reproductive performance in subtropical area. Semen was supplied by two commercial AI centers. A total of 671 female pigs from seven farms were inseminated with either 3횞109 or 5횞109 sperm per dose. Two types of semen were used: heterospermic semen from two boars of the same breed and homospermic semen from a single boar. After insemination, conception rate, farrowing rate, total litter size, and number of dead piglets were recorded. The analysis of variance indicated that there was no significant effect of interactions between pig farm, type of semen, or number of sperm on any of the traits measured. There were significant differences in conception rate, farrowing rate, and total litter size among pig farms (p<0.05). The effect of number of sperm per dose liquid semen (3횞109 or 5횞109) was not significant. Sows inseminated with homospermic semen showed significantly higher conception and farrowing rates but significantly lower total litter size (p<0.05). In conclusion, the number of sperm per dose liquid semen for AI could be lowered to 3횞109 without affecting reproductive performance in subtropical areas like Taiwan.
Keywords: Pig; Sperm Number; Semen Type; Artificial Insemination; Reproductive Performance; Subtropical Area

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