Effects of Compound Enzyme Preparation on Performance and Nutrient Apparent Digestibility of Lactating Cows
The object of this experiment was conducted to study the effects of compound enzyme preparation in the diet on performance and nutrient apparent digestibility,serum indexes of lactating cows.Conduct a complete group experiment and feed a test diet with an addition of 40g/(head·day)complex enzyme preparation for a duration of 9 weeks.The results showed that:① the compound enzyme preparation significantly improved the milk yield of dairy cows(P<0.05).②Compound enzyme preparation has no significant effect on dry material feed intake(P>0.05),significantly improve the feed efficiency(P<0.05).③The compound enzyme preparation had no significant effect on the milk protein content(P>0.05),significantly increased the milk fat content(P<0.05).④The apparent digestibility of dry matter was significantly higher at 60d and 40d than at 0d and 20d(P<0.05),no significant apparent digestibility between 60d and 40d(P<0.05),significantly higher than 0d,20d(P<0.05).The apparent digestibility of NDF,ADF and organic matter was significantly higher at 60d and 40d than at 0d and 20d(P<0.05),The apparent digestibility of starch was significantly higher at 40d and 60d than at 20d(P<0.05),no significant effect with 0d(P<0.05).Under the test conditions,the addition of compound enzyme preparation improved the performance and the apparent digestibility of nutrients.
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