5Nabuurs M J A , Hoogendoorn A, Van der Molen E J, Van Osta A L M . Villus height and crypt dept bin weaned and unweaned pigs , reared under various circumstances in t he Net herlands. Research i nV eteri na ry Science ,1993, 55:78-84.
6Miller B G , James P S, Smith M W , Bourne F J . Effect of weanin g on t he capacity of pig intestinal villito digest and absorb nut rient s. Jou rnal of A g ricul t u ral Science , 1986, 107:579-589.
7Bruce J M,Clark J J. Models of heat production and critical temperature for growing pigs[J].A nimalProd uct ion ,1979,28:353-369.
8Kabuga 3 D , Annor S Y. A note on t he development of behaviour of intensively managed pigiets in t hehumid t ropics. Animal Prod uction , 1992, 54:157-159.
9Xin H use and ,Zhou H ,Bundy d s. Comparison of energy piglet per2formance between conventional and energy - efficient heat lamps[J].Applied Engineering in Agriculture, 1997,13 ( 1 ) : 95-99.
10Andonov K,Dimov D - N. Modelling a system of floor heating inpiglet housing noted for its high heat capacity[J]. selskostopanskaTekfmilta ,1989 ,26:1 ,56 ,65 (Abstr.) .
