THE METABOLISM OF NITROGENOUS COMPOUNDS IN THE RUMEN OF COWS AT THE PRESENCE OF ZEOLITE IN THE RATION OF GRAZING PERIOD
S. M.Kolyada
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Institute of Animal Biology NAAS, st. Vasyl Stus, 38, Lviv, 79034, Ukraine
The effect of a zeolite in the ration of the cows on the synthesis of the rumen microbial protein, milk production and milk composition during the summer time have been studied in this work. This was formed three groups of cows (4 animals in each group), which were analogues of origin, age and month of lactation. 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 combined fodder. The structure of their feed included the following mineral elements: Sodium, Magnesium, Cobalt, Zinc, Copper, Phosphorus and Sulphur. Besides, 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. Content 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. The feeding to the cows of a mass of green grass-legume pastures along with a forage zeolite led to the probable decrease in the content of ammonia nitrogen in a liquid part of the rumen regardless of time relative to the start of feeding. Simultaneously, in the rumen liquid of those cows before feeding and on the 2nd, 7th and 10th hour from the beginning of feeding a level of amine nitrogen significantly decreased. In these conditions the rumen liquid of those cows on the 4th, and especially on the 7th and 10th hours from the start of feeding a level of protein nitrogen content increased; and before the feeding and on the 2nd, 7th, and especially on the 10th hour from the beginning of feeding a level of total nitrogen increased. The feeding to the cows of a mass of green grass-legume pastures along with a forage metal oxides and particularly zeolite resulted in a significant increasing of a milk yield in average daily. Simultaneously, the milk of cows which further were fed by zeolite a level of protein, fat and lactose likely increased.
Keywords: NITROGEN AMMONIA; AMINE NITROGEN; PROTEIN NITROGEN; TOTAL NITROGEN; COWS; THE CONTENT OF THE RUMEN; ZEOLITE
