Availability to digesting of fodder’s fiber and its fractions in the holshtein-kholmogory cow rations in the conditions of the European North

The production of roughages is the most important industry of agricultural production. The economic efficiency of dairy cattle breeding and the agricultural enterprise as a whole depends critically on the level of its development. Highly productive cattle breeding and the process of crossing cattle with Holstein breed, which began in recent years in the country, can developed successfully only when the quality of fodder, and especially the rough ones, is significantly improved. World experience confirms that if these conditions are not executed, achievement of selection progress is not used. Moreover, the farms are being economically damaged because their fodder base, and primarily the production of roughages, has a low level of development. Under such conditions, the genetically determined productivity of livestock, especially Holstein, is not showed. Fiber is of great importance in providing the energy needs of ruminants. Numerous studies have established that 40 to 75% of the crude fiber of fodder is digested in the gastrointestinal tract of cattle. The accessibility to the digestion of crud fiber and its fractions (NDF) and (ADF) in artificial rumen in fodders: hay, silage, haylage, dry beet bagasse. It has been established that certain fodders with a high NDF concentration may have a higher energy value than fodders with a low concentration of NDF. The content of NDF, ADF, crude fiber in haylage of perennial grasses ranges from 14.35 to 23.71%; from 7.53 to 10.27%; from 8.50 to 11.86%, respectively, with practically the same disintegration in the rumen. In the silage of perennial grasses, the NDF content is 8.4% higher than in the silage of annual grasses, its disintegration in the rumen is also higher by 13.97%. The content of crude fiber and its fractions, NDF and ADF in the hay, as well as disintegration in the rumen, varies within wide limits: content - from 16.38 to 35.93%; from 34.83 to 65.68%; from 21.91 to 39.02% respectively; disintegration - from 10.38 to 33.54%; from 24.63 to 34.58%; from 17.04 to 19.86% respectively.

roughage, fiber, Neutral Detergent Fiber (NDF), Acid Detergent Fiber (ADF), accessibility, digestibility, rations, cattle

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