8Suriyasomboon A, Lundehein N, Kunavongkrit A, et al. Effect of temperature and humidity on sperm morphology in Duroc boars under different housing systems in Thailand [ J ]. J Vet Med Sci, 2005, 67 : 77-785.
9Kunavongkrit A, Prateep P. Influence of ambient temperature on re- productive efficiency in pigs [J]. Pig J, 1995, 35: 43-47.
10Corcnera B D, Hernandez-Gil R, Romero C D, et al. Relationship of environment temperature and boar facilities with seminal quality [J]. Livestock Production Science, 2002, 74: 55-62.
