Based on 2127 first services in a field trial, the influence of sperm motility and morphology on the fertility of ten AI boars was investigated using semen stored for three and five days. Depending on sperm morphology the farrowing rate differed by up to 31% and the litter size differed by up to 3.4 piglets. Sperm motility and morphology are useful parameters in selecting sires for AI, especially in the case of inseminations with semen stored long-term.
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