Assessment of the biological value of forages according to the control tests of milk and its use in the organization of feeding of dairy cattle

The article presents the results of assessment biological usefulness feed according to control tests milk. Scientific research was carried out in LLC "Minskoye" Kostroma district region on a population 369 cows and Black-and-White breeds seasons year. authors found that terms level digestible protein lactating cows, there is an imbalance almost all year, so most animals are prone diseases associated with metabolic disorders. rumen acidity Koroma breed more stable (pH = 6.2-6.4) which indicates lower likelihood developing acidosis, contrast cows. Based indicators milk tests, insufficient supply raw during milking period established. highest daily yields (more than 30 kg milk) were obtained from first second periods lactation In availability 10.3-10.9 g/MJ, normal ratio fat: (1.26:1), profitability 66.11%, while 10.2 g/MJ less, had production 73.93 86.44%, respectively. When 11.0 animals, acidosis increases. Evaluation value feeds milkings will allow monitoring energy nutrition animals.