Effects Of Mixed Silage From Potato Residues And Corn Stalks On Performance Of Dairy Cows

This experiment ensiled the mixture of potato residues and straw stalk and determined its conventional nutrition ingredient, 24 cows of same age , parity, milk yield and Lactation days were randomly divided into 4 groups, Three of the test group were fed with 25%, 50%, 100% instead of mixed silage , the control group fed with whole-plant corn silage, Determined the milk yield and composition, digestion trial was carried in the last 10 days of Feeding trial , Finally, evaluated the effect of feeding cow with potato residues to provide the basis of use of Potato starch in feeding.The results show that: content of dry matter, crude fat and crude fiber of the mixed silage were 2.64%, 1.92% and 4.14% respectively lower than whole-plant corn silage, but content of Crude protein and phosphorus were 6.6% high 7.6% higher than the whole-plant corn silage, content of calcium is the same.Throughout the trial period, total milk production was not significant (P>0.05) ,Test-day milk production of groups one and two were a litter higher than the control group, and groups three declined slightly.Milk fat percentage of group two and three was significant difference with control group (P <0.05), raised 3.8% and 5.8% higher compared with the control group, The other groups had no significant difference (P> 0.05). milk protein between group two and group one were significant difference (P <0.05) ,The other groups had no significant difference (P> 0.05). Lactose of group three was 0.89% significant higher than the control group, The other groups had no significant difference (P> 0.05). Density and non-fat solids of group three was significantly different with group two(P <0.05).The rate of digestibility of DM of group three was significant difference with control group (P<0.05),raised 2.24%,the other groups had no significant difference (P>0.05). The rate digestibility of CP of the three test groups was very significant higher than the control group(P<0.01), raised 4.45%,2.94% and 4.71% respectively, group three significant than group two (P<0.05) , The other groups had no significant difference (P> 0.05). The rate of digestibility of ADF of the three test groups was very significant higher than the control group (P<0.01) , raised 8.32%, 11.29% and 9.16% respectively , The other groups had no significant difference (P> 0.05). The rate of digestibility of NDF of group three was very significant higher than the control group and group one (P<0.01 ),was significant higher than group two(P<0.05), group two significant than group one (P<0.05).