The study was conducted to investigate the effects of supplementation with polyunsaturated fatty acids of different vegetable oils and L-carnitine on boar libido, semen characteristics, fatty acid composition of sperm and semen antioxidant properties. Thirty adult Pietrain x Duroc hybrid boars with similar age and body condition were randomly divided into 3 groups with 10 replicates and 1 pig in each replicate. The diet of group 1 was supplemented with 1.5% soybean oil; group 2 was supplemented with 1.5% soybean oil +200 mg/kg L-carnitine; group 3 was supplemented with 0. 3% of soybean oil +1.2% flax seed oil +200 mg/kg L-carni-tine. The feeding trial lasted for 16 weeks. The results showed that the semen volume and ejaculation duration of boars in group 3 were significantly higher than those in the other two groups (P <0. 01) , and the reaction time was significantly less than those in the other groups (P <0.01). The sperm motility of boars in group 3 was significantly higher than that of the boars in group 1 (P <0.01), and the sperm density was higher than that of the boars in group 1 (P >0.05). During 8 to 16 weeks, the sperm docosahexaenoic acid (DHA, n-3) content and activity of superoxide dismutase (SOD) of boars in group 3 were significantly higher than those in the other groups (P <0.05). The malondialdehyde ( MDA) content in semen of boars in group 1 was significantly higher than those in the other groups (P <0.01) during 8 to 16 weeks. The results suggest that dietary polyunsaturated fatty acids and L-camitine could enhance the boar libido, increase the sperm DHA content and semen antioxidant properties, and finally improve the boar semen production, sperm motility and sperm density. [Chinese Journal of Animal Nutrition, 2011, 23(8):1361-1369]%本研究旨在考察富含多不饱和脂肪酸(polyunsaturated fatty acid,PUFA)的不同植物油和L-肉碱的不同添加方式对种公猪精液品质、性欲、精子脂肪酸组成及精液抗氧化性能的影响.试验选用30头年龄、体况相近的成年皮特兰×杜洛克杂交种公猪,随机分为3组,每组设10个重复,每个重复1头猪.试验组公猪分别饲喂添加1.5%大豆油(试验组1)、1.5%大豆油+ 200 mg/kg L-肉碱(试验组2)、0.3%大豆油+1.2%亚麻油+200 mg/kg L-肉碱(试验组3)的饲粮.饲养试验共16周.结果表明:试验组3公猪精液量和射精持续时间均极显著高于其他各组(P＜0.01),且反应时间极显著低于其他各组(P＜0.01),精子活力极显著高于试验组1(P＜0.01),精子密度高于试验组1,但差异不显著(P＞0.05)；8～16周时,试验组3公猪精子中二十二碳六烯酸( DHA,n-3)和超氧化物歧化酶(SOD)活性显著高于其他各组(P＜0.05),试验组1公猪精液中丙二醛(MDA)含量极显著高于其他各组(P＜0.01).结果提示,饲粮添加亚麻油和L-内碱可以通过增强公猪性欲、增加精子中DHA的含量以及精液抗氧化性能,从而提高种公猪的精液产量、精子活力和精子密度.
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