DAILY AVERAGE EXCRETION OF NONESTERIFIED FATTY ACIDS VIA MILK, MILK PRODUCTION AND MILK COMPOSITION IN COWS IN CASE THE PRESENCE METAL OXIDE AND ZEOLITE POWDER IN RATION OF PASTURE PERIOD
The effect of metal oxides and а zeolite powder in the ration of the cows during the summer period into daily average nonesterified fatty acids excretion with milk, milk production and milk composition have been studied. Three groups of cows of Ukrainian black-and-white dairy breed in the first half of lactation was formed. The cows of control, I and II experimental groups from May till July grazed on pasture with a young grass-legumes. In addition, the experimental cows got a feed which contained, % barley - 20; fodder wheat - 27; oats -13; sunflower seed cake - 22; waste wheat - 18. The structure of their feed included the following mineral elements: magnesium, cobalt, zinc and copper. The cows of I research group as part of feed were fed by characteristic mixture of zeolite minerals with the following chemical composition (the mass fraction): SiO2 – 70,0; Al2O3 – 12,0; Fe2O3 – 1,0; FeO – 0,6; TiO2 – 0,1; MnO – 0,1; P2O5 – 0,1; K2O – 3,1; Na2O – 1,8; SO3 – 0,1; CaO – 7,1; MgO – 4,0. The cows of II experimental group as part of feed were fed by zeolite. Number of minerals and zeolite in the fodder for the cows of I and II experimental groups was 0.4 g / kg body weight of the animal. In the end of experimental period digestible trial was conducted and samples of milk was selected for laboratory researches. The selected samples were tested for nonesterified fatty acids. For cows were fed by mass of green grass-legume pastures, feed, metal oxides, and especially zeolite powder increased daily average nonesterified fatty acids excretion with milk by increasing saturated fatty acids with even and odd number of carbon atoms in the alkyl chain and especially monounsaturated fatty acids n-7 and n-9 fatty acids families and polyunsaturated fatty acids n-3 and n-6 fatty acids families. The feeding to the cows of a mass of green grass-legume pastures, feed, metal oxides, and especially zeolite powder, led to significant increased average milk yield. Simultaneously, the milk of cows which further were fed by zeolite a level of protein, fat and lactose significant increased.
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