The composition of fatty acids in milk is affected by the fat source and level in the diet. Whole cottonseed as a feed can not only provide energy and protein, but also can provide effective fiber. It is a very good feed material for ruminants, and proper addition can increase the milk fat of dairy cows. Rate and milk production. This study group designed and tested group A as a control group and was fed a basic diet; group B, C, and D were fed test diets containing 5%, 10%, and 15% cottonseed, respectively, containing all cottonseed substitutes. Part of the basic diet concentrates silage and cereal grass. Through the test, the following results are obtained:
First, the impact of milk production
Total cottonseeds can increase dairy milk production and correct milk production (the milk fat percentage is adjusted to 4% milk yield). Milk production in groups B, C, and D increased by 0.90, 1.16, and 1.08 kg/day, respectively, compared to group A, B. Corrected milk production in groups C and D was 1.30, 3.55, and 3.32 kg/day, respectively, higher than in group A.
Second, the impact of milk composition
Cottonseeds can significantly increase the milk fat percentage of dairy cows, in which the milk fat percentages in groups C and D are 18.10% and 17.51% higher than those in group A, respectively. Compared with group B, the milk fat percentages are increased by 14.37% and 13.9% respectively. There was no significant effect on milk protein rate, lactose rate, and non-fat solids content.
Third, the impact on the composition of milk fat fatty acids
1. Different chain length fatty acids in milk fat. The proportion of cotton seeds in the diet significantly affected the content of different chain fatty acids in the milk fat. Compared with group A, the content of short chain fatty acids in groups B and C significantly reduced the content of medium chain fatty acids in each group by 40.76%, 38.60% and 37.44%, respectively. , 31.63%, B, C, D three experimental groups of the medium-chain fatty acid content were lower than the A group, which D group was significantly lower than the A group, but the difference between the experimental groups did not significantly B group long-chain fatty acid content Significantly higher than group A, C and D groups were significantly higher than group A.
2. Fatty acid saturation in milk fat. Cottonseed meal improved milk fat fatty acid saturation The total saturated and monounsaturated fatty acids in the whole cottonseeds decreased. Among them, the saturated fatty acids in the B and C groups decreased by 27.10% and 28.41% compared with the A group, respectively. The content of saturated fatty acids was 5.22% higher than that in group A; the content of polyunsaturated fatty acids in group B, C, and D was increased by 7.55%, 4.84%, and 8.93%, respectively, compared with group A. There was no significant difference among the three groups.
Therefore, adding a certain percentage of whole cottonseeds to dairy cows' diets can significantly increase the milk production and milk fat percentage of dairy cows and improve milk quality. In a comprehensive judgment, the proportion of cotton seeds suitable for dry matter basis of the diet is 10%.
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