Thus, when balancing the diet according to the need for protein, it is necessary to take into account not only the amount of total gray protein, and the levels of its fractions: RDP and RUP.
Otherwise, if you do not pay attention to the level of "scar" (RDP) and bypass (RUP) protein when balancing the diet for crude protein, it can lead to excessive feeding of nitrogen without real stimulation of milk productivity.
The "scar" fraction of RDP protein is fermented by microorganisms to nitrogen, using it for its vital functions. This is the process of formation of microbial protein, which is also necessary for cows.
However, excess nitrogen that has not been used by the microorganisms in the rumen is absorbed through the blood in the form of ammonia to the liver, where it is converted to urea. Some urea circulates in the body, the excess is excreted in urine and milk.
The main task of the management of feeding cows at the dietary level is to maximize the work of the rumen. Balancing the protein diet is to maximize the production of microbial protein without overloading the rumen, liver and excessive production of toxic urea in the cow.
Here are some tips to help maximize microbial protein production without adversely affecting rumen and cow health.
The target content of rumen digestible protein (RDP) is not more than 56-60% of the total protein, or 100-105 g / kg of dry matter of the diet.
If rumen digestible protein (RDP) is not enough, then we "malnourish" rumen microorganisms. This will have a detrimental effect on cicatricial digestion, in particular, reducing the digestion of structural carbohydrates, reducing fat in milk.
When oversaturated with rumen protein (RDP), its fermentation in the rumen will have a toxic effect on the cow's health. This has a particularly negative effect on the liver, and then on the reproduction and productivity of the herd.