Influence of different selenium and iodine offer during the grazing period of sheep on the milk yield, milk performnce and daily protein, fat and lactose secretion
2011
Angelov, L., Institute of Cryobiology and Food Technologies, Sofia (Bulgaria) | Tsvetkova, V., Institute of Cryobiology and Food Technologies, Sofia (Bulgaria) | Jahreis, G., Institute of Cryobiology and Food Technologies, Sofia (Bulgaria)
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 0.25 mg selenium in the form of NaHSe03 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 30th and the 60th day after supplementation. Selenium and iodine deficiency in the ration reduced the milk yield during the whole period (60th 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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