Agrarian Science and Food Technologies

Posternak L.I., Candidate of Agricultural Sciences, Associate Professor

Vinnytsia National Agrarian University

Nitrogen balance characterizes the transformation of protein substances in the animals body. It is known that some protein compounds of the fodder are cleaved to the amino acids in the digestive tract. The rest of the undigested protein goes out with feces. In the intestine the amino acids are absorbed into the bloodstream and spread throughout the body. Due to these amino acids the tissues and cells meet their nitrogenous needs for the restoration for newly-created (growing animals, cellulose, etc.) ones. The excessive amino acids are de-substituted.

During experiments nitrogen balance was determined by a conventional method based on the calculation of eaten feeds, excreted urine and feces, and laboratory analysis data according to the formula: feed nitrogen – (urine nitrogen + feces nitrogen) = retained in the body nitrogen.

The wethers were fed by alfalfa grass of different maturity stages. The researched nitrogen balance was positive, but unequal for the studied varieties.

The level of nitrogen assimilation in the animals body fed by Lubava alfalfa variety has been increased according to the developmental phase from 9.27 to 14.90 g (P<0.01).

When animals are fed by Regina alfalfa variety in the phase of budding, nitrogen assimilation is almost the same but it decreased at the flowering phase. At the phase of the start of budding this indicator was 10.97 g but in the phase of full flowering it was 5.48 g. The difference is probable (P<0.01). The assimilation of nitrogen in the researched sheep body was reduced due to the deterioration of the consumption of Regina alfalfa variety.

When the researched animals are fed by the Liubava alfalfa variety nitrogen percentage increased. When the researched animals are fed by the Vinnychanka alfalfa variety nitrogen percentage remained practically unchanged from budding to flowering phases.

There was an unexpected difference (P>0.01) in the assimilation of nitrogen by animals between the phases of the budding beginning and full flowering.

The Vinnychanka alfalfa variety has the highest percentage of nitrogen assimilation by sheep. At the budding phase it was 11.14 g, and at the phase of full flowering it was 12.51 g, respectively 38.0% and 38.2%.

The sheep assimilated the alfalfa nitrogen at the budding stage of the Vinnychanka variety when green grass both the first and second slopes is used. However, the Liubava variety has got the first place among the researched varieties taking into consideration quality of the protein.

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