The Animal Biology

THE CONTENT AND COMPOSITION OF LIPIDS OF THE LONGEST BACK MUSCLE IN YOUNG SHEEP OF DIFFERENT AGE UNDER CONDITIONS OF INTENSIVE FATTENING

The article deals with the data on the effect of intensive fattening of young sheep on the live weight growth, the chemical and lipid composition of the tissues of the longest back muscle, its biological and nutritional value.

The experiment was conducted on the lambs of Ascanian thin rune breed of Taurian type. According to the analogue method, 6 newborn animals with an average live weight of 4.58 kg were selected and kept on the suction till 1.5 months of age.

It was found out that in the sucking period, the live weight of lambs was on average 12.3 kg, the absolute growth was 7.8 kg, and the average daily growth was 172.1 g. After transferring animals into intensive fattening, the daily increments of live weight increased to 215.0 g in 4-month-old animals and to 228.2 g — in 5-month-old animals, or to 24.8 and 32.5 % in comparison with 1.5-month-old animals which were on the suction.

In the longest back muscle of 4-months-old lambs, compared to 5-months-old ones, there is less dry matter content (by 1.08 %) and total fat (1.74 %).The increase in the content of total lipids in the muscle of 5-months-old animals occurred only at the expense of triacylglycerols (by 6.18 %), since other fractions (unterified and esterified cholesterol, mono- and diacylglycerol) in the smaller or almost the same amount as in the 4-month-old animals. After that the animals were transferred to intensive fattening. The decrease of total phospholipids in the longest muscle of the lamb’s back of the 5-month-old animals took place due to a possible reduction of the phosphatidylethanolamine fraction by 2.49 %. However, in the muscle of younger animals (4 months) contains a greater number of common phospholipids due to an increase of the mainly nitrogen-containing fractions content, in particular, phosphatidylethanolamine and phosphatidylcholine as metabolically active components of cell membranes, which can testify to the intensity of metabolic processes in them, as well as the best biological and nutritional value of such meat.

Keywords: LAMB, FEEDING, LONGEST BACK MUSCLE, LIPIDS, PHOSPHOLIPIDS, CHEMICAL CONTENT

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