Abstract
This experiment was conducted to determine the effect of protein level on performance and serum biochemical indicators in dairy goat. 45 healthy dairy goats in lactation with same weight, milk yield, parous (2~3 times) were used by single-factor randomized design and equally divided into 3 groups and 15 goats per group. Dietary protein level was 10%, 12.5% and 15% respectively. It was 10 days in advance to do the preparation of experiments, followed by the period of time in true experiments with 35 days. Results: The higher dietary protein levels can increase milk production significantly (P 0.05), the group of 12.5% have the highest milk contents, The goat albumin, urea nitrogen content in group with 12.5% and 15% dietary protein level were significantly higher than that of group with 10% (P 0.05); The different dietary protein levels had no significant effect on total cholesterol, glucose, and serum alanine aminotransferase and aspartate aminotransferase activity (P>0.05) Conclusion: According to the 4% standard milk production, milk composition and serum biochemical indexes, the 12.5% of dietary crude protein level was more conducive to play production performance of dairy goat.
Highlights
Goat milk is increasingly favoured by consumers with its nutrientrich, higher calcium content, digestible and absorbed, lower cholesterol
In order to change this situation, dairy goat rearing has entered a process of large-scale breeding, diet as their main source of nutrition, Nutritional composition and nutrient content of the diet has an important influence on lactation performance and digestion and metabolism of dairy goats, it is extremely necessary to study on the nutrient requirements of each diet
Nutrition is the most important factor in above, the rational use of the diet is essential for the development of high-quality milk maximum production potential. Such as Davidson et al [1] have reported, the effects of milk yield and milk composition were affected by dietary factors.Suitable crude protein level in the diet makes dairy goat and give full play to the high level of performance, can improve the utilization efficiency of dietary protein, and reduce the nitrogen pollution caused by animals which eat a lot of dietary crude protein.In this paper, we give the goats three diets which had different dietary crude protein level, and we discussed the effects of different protein levels on the production performance and serum biochemical indexes of dairy goats
Summary
Goat milk is increasingly favoured by consumers with its nutrientrich, higher calcium content, digestible and absorbed, lower cholesterol. Nutrition is the most important factor in above, the rational use of the diet is essential for the development of high-quality milk maximum production potential Such as Davidson et al [1] have reported, the effects of milk yield and milk composition were affected by dietary factors.Suitable crude protein level in the diet makes dairy goat and give full play to the high level of performance, can improve the utilization efficiency of dietary protein, and reduce the nitrogen pollution caused by animals which eat a lot of dietary crude protein.In this paper, we give the goats three diets which had different dietary crude protein level, and we discussed the effects of different protein levels on the production performance and serum biochemical indexes of dairy goats. Provide data support for preliminary determination of suitable dietary crude protein of lactating dairy goat
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