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Influence of different Selenium and Iodine Offer during the Grazing Period of Sheep on the Milk Yield, Milk Performance and Daily Protein, Fat and Lactose Secretion


Influence of different Selenium and Iodine Offer during the Grazing Period of Sheep on the Milk Yield, Milk Performance and Daily Protein, Fat and Lactose Secretion



Bulgarian Journal of Agricultural Science 17(2): 139-144



ISSN/ISBN: 1310-0351

The large population size of different sheep breeds and their wide adaptability to forage quality, make sheep widely accepted and genetically of great potential for production of ewes milk and different milk products. However, the established imbalances of basic essential elements in the flora (Se, I)) in the investigated area (Rhodope Mountain - Village Borino) affected negatively the milk production during the pasture period. Through the milking periods (April-June) the control ewes were additionally supplemented "per os" with 0.25mg selenium in the form of NaHSe0(3) and 0.15 mg iodine in the form of KI daily. The experiments were carried out with 16 ewes of Rhodope Tsygai breed, divided into two groups. The animals were fed according to ARC norms with different amounts of selenium and iodine during the experimental period. The milk samples were taken on the 30(th) and the 60(th) day after supplementation. Selenium and iodine deficiency in the ration reduced the milk yield during the whole period (60(th) days) by 44%. The Se-I-unsupplemented ewes produced daily 35% less fat and 41% less milk protein in comparison to the supplemented one.

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