Effects of Plant Extracts on Feed Intake,Milk Production Performance and Serum Biochemical Indicators of Mid-to-Late Lactating Cows
[Objective]To study the biological functions of tea polyphenols and phytosterol complexes and their effects on feed intake,milk production performance and serum biochemical indicators of mid-to-late lactating cows.[Method]Sixty healthy cows with similar age,parity,lactation time and milk yield were randomly divided into 2 groups,with 30 cows in each group.The control group was fed a basic diet,and the experimental group was fed a basal diet supplemented with 20 g/d plant extracts.The pre-trial period lasted for 7 days and the experimental period lasted for 70 days.Milk and blood samples were collected and milk composition and serum biochemical indicators were determined.[Result]Dry matter intake decreased by 0.51 kg/d and milk yield increased by 0.85 kg/d in experimental group(P>0.05).Serum triglycerides in experimental group decreased by 45.6%compared with control group(P<0.05).Compared with control group,serum prolactin and growth hormone in experimental group were significantly increased(P<0.05).[Conclusion]Supplementing 20 g/d tea polyphenols and phytosterol complexes can improve milk production efficiency,fat metabolism and productivity of cows.
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