Rumen bypass fat - Рубец обойти жир: Feeding of bypass fats are and will further be one of the most efficient ways to increase the energy density of rations for high yielding milk cows. However the economic success of using supplemented fat depends not only on proper selection of fat sources, but also on knowing how much and when to feed fats. Rumen bypass or “protected” fats are fat powders that are processed for easy handling and mixing. Dry fats naturally have high melting points, so they are almost insoluble at rumen temperature environment.
Bypass fat comprises fatty acids associated with calcium ions, instead of a glycerol backbone. When calcium is associated with fatty acids, the fat supplement thus formed is rumen inert. Bypass fat has low solubility in the rumen and is less susceptible to bio- hydrogenation.
Role of bypass fat in rations of the high producing dairy animals is very crucial for enhancing the energy density of the ration. Dietary fat, that resists lipolysis and bio-hydrogenation in rumen by rumen microorganisms, but gets digested in lower digestive tract, is known as bypass fat or rumen protected fat or inert fat. Among all forms of bypass fat, calcium salts of long chain fatty acids (Ca-LCFA) is relatively less degradable in rumen, has highest intestinal digestibility and serve as an additional source of calcium. A simple cost effective indigenous technology has been developed for the preparation of bypass fat (Ca-LCFA) using vegetable fatty acids. Ration of the high producing animals should contain 4-6% fat, which should include fat from natural feed, oil seed and bypass fat in equal proportions. Supplementation of bypass fat had no adverse effect on the rumen fermentation, feed intake, digestibility of nutrients and different blood parameters of the dairy animals. The milk yield is increased by 5.5-24.0% along with the improvement in post-partum recovery of the body weight and body condition score and reproductive performance of the dairy animals. Further research is necessary to find out the supplemental effect of the bypass fat on dairy animals fed various types of basal rations at different productive levels and stages of lactation.
Rumen bypass or “protected” fats are fat powders that are processed for easy handling and mixing. Dry fats naturally have high melting points, so they are almost insoluble at rumen temperature environment.