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The Breeding Boar- Maximizing Productivity

A. M. King’ori
Vol 2(3), 7-14

Boar numbers in a pig enterprise are fewer compared to sows, but one boar is more important than a single sow Boar productivity is influenced by genetic and environmental factors. A breeding boar should be selected on the basis of genetic potential and physical characteristics. Boar fertility is assessed by seminal volume, number of sperms per ejaculate, morphology, sperm motility and intensity of motion. Adequate seminal analysis should be performed to evaluate fresh boar ejaculate to assess its fertility indicators. Sperm morphology and motility are seminal analysis methods that are easy to perform under commercial conditions but are not sensitive predictors of fertility. When a boar is subjected to stress it takes 14 days before abnormalities in ejaculate are detected. Design of AI catheters that deposit semen into the cervical end of the uterus has made it possible to reduce sperm cell numbers per dose by 80% without change in fertility. There is variability among boars in post-thaw sperm quality variables. Housing design and social comfort of the boar influences semen quality. Energy and protein nutrition of the boar is usually adequate; however, the effect of micro-minerals and vitamins on semen quality should be studied. Many interrelated factors influence boar productivity and each should be given adequate attention to maximize boar productivity.

Keywords : pig boar semen AI mating fertility

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