Protective fats are rumen insoluble substances, coated on the surface of oils and fats to prevent rumen fermentation, so as to achieve the purpose of protecting the fat, but not destroyed by the rumen, the fat can be fully digested and absorbed after entering the small intestine. use. Protective fats are used in dairy cows to increase milk production, improve milk quality, reduce stress and improve reproductive performance of dairy cows. The benefits of protective fat feeding cows is a new technology, and specific actions should be taken care of:
Select the type of protective fat products: In the practical application of protective fat feeding dairy cows, fatty acids with short carbon chains in protective fatty products should be selected, and fatty acids with short carbon chains with protective carbon chains are well absorbed into the intestine and have high utilization rates. Also pay attention to the choice of unsaturated fatty acids, better absorption than saturated fatty acids, the effect is good. If the fat used in production is not coated, special attention should be paid when feeding cows: one is to control the added amount; the other is to increase the content of calcium and magnesium in the diet.
Controlling the amount added: Because adding too much wastes both the amount of energy consumed and the amount of milk consumed by the cow, resulting in a reduction in the production performance of the cow. Generally, the total fat content in dairy cows' diets reaches 5% to 6%. Dairy cows have the best utilization rates. When the amount is more than 6%, there will be side effects on the production of dairy cows. On the contrary, when the amount is small, if it is less than 3%, the effect is not obvious.
Adding time should be timely: Post-calving dairy cows consume a lot of energy and adding fat itself is also a stress, so cows should not be added in the short term after delivery. Should be fed after 3 weeks to 5 weeks postpartum, the impact of stress after the addition of the smaller, the milk production will appear to temporarily drop, but then the milk production will gradually increase. In the hot season, it is better to enter the lactation period and can prolong the peak period of milk production. It will increase milk production throughout the lactation period. However, the effect of lactation to the late stage is not obvious, and there is no need to use this protective fat.
The composition of the diet should be reasonable: Feed cows with protective fat, should be fed with high-quality hay, so that the amount of fiber to meet the requirements, can promote the rumen more acid production, so as to give full play to the role of fat, milk production and milk fat ratio can be significantly increased In the diet, the dry matter crude fiber content was 17%, and the acid laundry fiber was 21%.
Distinguish the applicable objects: Cow protective fat is mainly suitable for high-produce dairy cows to adapt to low-yielding dairy cows, and the feeding effect is not good. If the average milk yield of the herd is less than 25.5 kg, no need to add grease, the milk yield exceeds this average value. The fat can be added to increase the energy of the diet to meet its production needs. Practice has proved that dairy cows whose milk fat percentage is less than 3.5% have good use effect. When the milk fat percentage is higher than 3.5%, the effect of adding is not obvious.
Step by step: feeding dairy cows protective fat, should gradually increase the amount of feed not to reach the required amount in one step, to avoid the problem of poor palatability, should be divided into three stages to the required quantitative, generally after 3 weeks to 4 weeks to use the full amount, This will not significantly affect the palatability of dairy cows.
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