Economical Benefit Analyses and Quality Evaluation of Sweet Potato Ground Silage

ZHENG Jing-ling1,WANG Rui1,XU Ying1,ZHANG Rong-kui2,FU Mei-fen3,WANG An-kui3,YANG Guo-rong3 (1.Yunnan Agriculture Vocational Technical College,Kunming 650212;2.Dongchuan Science & Technology Association of Kunming City,Dongchuan 654100;3.Yunnan Beef Cattle & Pasture Research Center,Kunming 650212)

Fresh sweet potato;Sweet potato;Sorbent;Quality evaluation;Economical benefit

For the purpose of keeping and reserving the succulence of fresh sweet potato,the rape,rice and wheat bran were mixed with sweet potato.The result showed that there was significant difference(P<0.01) in content of DM,CP,EE and ashes between ground silage of sweet potato vines and fresh sweet potato vines: The proportion of DM in ground silage was higher than that of DM in green vines,and the content of CP and EE in vine silage was ten times of that in green vines respectively.In term of nutritional value,ground silage was generally evaluated to be superior to green vines.However,the difference of these indexes in silage products of sweet potato vines,which made from mixtures of green vines and three types of sorbents(grape residues,rice brans and wheat brans) was not so significant.Fed on ground silage of sweet potato vines,pigs got body gain 100 grams higher than control group per day,which indicated that animals could be sold ten days earlier by utilizing ground silage,and the cost of feeding ground silage was 3.10 RMB,which was lower than control group(3.62 RMB).