5Jorquera A P,Ponce J G S, S6nchez -Mendoza B, et al. Digestion and energy value of macerated Su- dan Grass hay used in growing- finishing diets for feedlot cattle [J]. Scientia Agricola( Piracicaba, Bra- zil) ,2011,68 (6) :615 - 619.
6Salinas - Chavira J. , Alvarez E. , Montano M. F. , et al. Influence of forage NDF level, source and pelletizing on growth performance, dietary energet- ics, and characteristics of digestive function for feedlot cattle[J]. Animal Feed Science and Tech- nology ,2013,183 (3) : 106 - 115.
7Sawal R K, Sharma K C. Nutritive evaluation of Sorghum Sudan Grass hay alone and in combination with cowpea hay in sheep [J]. Indian Journal of Animal Nutrition ,2009,26 (4) :333 - 336.