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Records collected in two experimental Pietrain lines were analyzed in order to examine the influence of halothane sensitivity on reproductive performance. Two data sets were utilized. In the purebred Pietrain data set, effects of halothane phenotype (HN = halothane-negative, HP = halothane-positive) of both sires and dams were investigated on 600 mating records and 424 litter records involving 190 HN and 151 HP dams and 41 HN and 35 HP sires. In the Pietrain x Large White data set, effects of halothane phenotype of a sub-sample of Pietrain sires (26 HN and 25 HP) were estimated using 530 mating records and 422 litter records. The effect of dam halothane phenotype in purebred Pietrain lines was non-significant (P > .10) for all traits. No significant effect of sire halothane phenotype on fertility traits was found in both data sets. The influence of this factor reached (P < .05) or approached (P < .10) significance for a few litter productivity traits, but the results were not consistent between purebred and crossbred litters. Overall, it may be stated that in the two Pietrain lines under study, HP boars and sows did not exhibit poorer reproductive performance than HN ones. This disagrees with earlier studies showing varying reductions in prolificacy of HP sows in other populations. The most likely explanation is that the H blood group system, closely linked to the halothane locus, plays a greater role, through the adverse effect of the Ha blood type on litter size.

Effects of halothane sensitivity on male and female reproductive performance in Pietrain lines