马铃薯藤蔓青贮对奶牛生长性能、泌乳性能及血清生化指标的影响OA

This study was conducted to evaluate the effects of substituting corn silage with potato vine silage(PVS)at graded levels on dry matter intake(DMI),body condition,lactation performance,and serum biochemical indices in Holstein dairy cows.Forty healthy multiparous cows with similar parity,days in milk,and milk yield were randomly divided into four groups(n=10).The control group was fed a basal total mixed ration,while the T10,T20,and T30 groups received diets in which PVS replaced 10％,20％,and 30％of the corn silage on a dry matter basis,respectively.Following a 14-day adaptation,the experiment lasted for 70 days.Results showed no significant difference in DMI among groups(P>0.05).The final body weight and weight change rate were significantly higher in the T20 and T30 groups than in the control(P<0.05).For lactation performance,milk yield was highest in T20(34.21 kg/d),significantly surpassing the control and T30 groups(P<0.05),whereas milk fat and protein percentages were unaffected(P>0.05).Serum analysis indicated that blood urea nitrogen increased significantly in all PVS groups(P<0.05),and glutathione peroxidase activity was notably enhanced in T20(P<0.05).All liver function indices remained within normal physiological ranges.In conclusion,replacing 20％of corn silage with PVS effectively improved milk yield and antioxidant capacity without causing metabolic disturbance,demonstrating its potential as a viable unconventional roughage resource.