STUDY THE EFFECT OF VITAMIN AND MINERAL PREMIX ON THE MILK YIELD AND QUALITY OF SHEEP MILK FROM WEST-BALKAN BREED, REARED IN THE MACRO AND TRACE ELEMENT DEFICIENCY REGION

Liubomir Angelov, Silvia Ivanova, Tsonka Оdjakova, Dimitar Gadjev

Abstract: The role of natural deficiency in pasture grass during the grazing period (April-June) of West-Balkan Sheep and its crosses in the region of Viskyar Mountain on the physic and chemical characteristic of sheep milk had been examined. The chronically mineral deficiency of the macro nutrients and trace elements (calcium, phosphorus, copper, selenium, iodine, cobalt ) influenced negatively the milk performance and the quality of dairy products. The milk yield continually decreased by 2.13 times in the control group and 1.89 times in the deficiency group during the lactation period. The smallest differences in the yield of milk between the two groups were found on the 40th day (14%) and the highest at the beginning of the milking period (54%). The experimental model with West-Balkan sheep after addition of inorganic nutrients demonstrated an increase amount of fat in the milk, a decrease of the protein content and small variations in the amount of lactose in the supplemented group in comparison to the deficient one. The use of additive increased the milk yield during the lactation period of ewe’s, during the feeding on the pasture under multi element deficient condition.

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Date published: 2023-01-31