Fertility of Liquid Boar Semen as Influenced by Breed and Season

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Abstract
Landrace, Duroc, Yorkshire, Pietrain, Hampshire and crossbred females were inseminated with liquid semen containing 5 × 109 spermatozoa in 50 ml glucose-milk extender one or two times during 1,883 estrous cycles. The semen was collected from 27 Landrace, 35 Duroc, 29 Yorkshire, 22 Minnesota No. 2, 14 Pietrain and seven Hampshire boars. Only semen exhibiting over 70% motile spermatozoa was used. This report includes data from one year's inseminations with purebred semen at the Taiwan Pig Research Institute. The data were analyzed for effect of breed, age of females and season of the year on fertility. The farrowing rates in crossbred and Landrace females (78.2 and 72.3%, respectively) were higher (P<.05) than for the other breeds (60.0 to 63.1%) except in Pietrain (68.8%). Inseminations with Landrace, Minnesota No. 2 and Duroc semen resulted in higher (P<.05) farrowing rates (74.3 to 71.3%) than Yorkshire semen (63.2%). Pietrain and Hampshire boars were not different from any of the other breeds. Regardless of breed, inseminations in females of the same breed as the boar resulted in lower (P<.05) farrowing rate (65.4%) than inseminations in purebred females of a different breed (70.7%) or crossbred females (78.2%). The number of pigs born alive per litter was affected by the breed of females but not the breed of males. Crossbred females produced significantly (P<.01) more live pigs per litter (9.51) than Landrace females (8.59). The latter breed farrowed more live pigs (P<.01) than the other breeds (6.80 to 8.02) with the exception of Pietrain (8.34). The correlation between conception rate and litter size for females was .66 between breeds. Within breeds the correlation was poor (.20). There was no significant effect due to age of the female with the age grouping used or to the season of the year on fertility. Copyright © 1976. American Society of Animal Science . Copyright 1976 by American Society of Animal Science.

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