THE EFFECT OF DIFFERENT LEVEL NEUTRAL DETERGENT FIBER IN THE DIET ON THE COW SUPPLY WITH AMINO ACIDS
Abstract
The level of neutral detergent fiber (NDF) in the dry matter of dairy cows’ diets in their first lactation phase produces an influence on the nitrogen exchange in the animals. The experiment was made in 3 groups of Kholmogor cows, 3 cows in each of the 3 groups, in the first third of their lactation (15–105th days). During the first period (15–45th day) the cows of the 1st, 2nd and 3rd groups received roughages in the form of corn or motley grasses silo with NDF level as 29.0, 31.3, and 33.5%, respectively. In the second period of the experiment (45–75th day) the relationship between roughages and concentrates varied in the groups at the NDF level: 32.1, 35.1 and 38.1%, respectively. In the third period of the experiment (75–105th days) the relationship between the silo and hay varied at the same NDF level in the groups (on average, 38.1). The investigation showed that the optimal NDF level in diets at lactation peak is to be within 31.0–35, 0% in high yielding dairy cows. Herewith, it was marked that the mammary gland consumed free essential amino acids more than in other cases.
About the Author
Yu. V. Sizova
Нижегородский государственный инженерно-экономический институт
Russian Federation
Russian Federation
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For citations:
Sizova Yu.V. THE EFFECT OF DIFFERENT LEVEL NEUTRAL DETERGENT FIBER IN THE DIET ON THE COW SUPPLY WITH AMINO ACIDS. Bulletin of NSAU (Novosibirsk State Agrarian University). 2014;(4):109-114. (In Russ.)
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