6Wondra K J,Hancock J D,Behnke K C, et al.Effects of particle size and pelleting on growth performance,nutrient digestibility,and stomachmorphologyin finishingpigs [J].Anim Sci, 1995,(73): 757 - 763.
7Liburn, MS, K Ngian - Killing, and D J Myers - Miller.. Growth and development of broiler breeders. 2. Independent effects of dietary, formulation versus body weight on skeletal and muscle gruwth. Poultry Sci,1989,68:1 273 - 1 281.
8Sibblad,I R et al. Poultry Sci. 1963,42:1 325.
9Edward et al. Poultry Sci. 1975,54 : 1230.
10NRC. 9th. Ed. National Academy Press . Washinton D C 1994.
