FEED CONSUMPTION, REPRODUCTIVE FUNCTIONS, RUMEN METABOLISM, DIGESTIVENESS AND NITROGEN BALANCE IN HIGHLY PRODUCTIVE COWS IN THE SECOND PERIOD OF LACTATION FOR THE FERTILIZATION OF MIXED- LIGAND ZINC, MANGANESE AND COBALT COMPLEXES
The presented indicators of feed consumption, reproduction, scar fluid, digestibility of nutrients and average daily balance of Nitrogen in highly productive cows of Holstein, Ukrainian Black-Spotted dairy breed and Ukrainian Red-Spotted dairy breeds in the second period of lactation by feeding them different doses of mixed-ligand complexes of Zinc, Manganese and Cobalt.
Consumption of feed mixture by experimental animals ranged from 46.2 kg to 52.2 kg. It was best consumed by cows of the 5th experimental group, in the feed mixture of which the concentration of trace elements in 1 kg of DM was: Zinc – 35 mg, Manganese – 35, Cobalt – 0.4, Selenium – 0.3, Copper – 10 mg and Iodine – 0.9 mg. It is set up that the use of different levels of mixed-ligand complexes of Zinc, Manganese and Cobalt reduces the duration of the service period in cows compared with its average value for the herd, which is 145.6 days.
In the rumen fluid of experimental cows, the pH value was increasing in the alkaline direction and the difference to the control group was statistically significant. It also decreased the content of total nitrogen compared to control, which indicates its better absorption into the blood. At the same time, the content of protein and ammonia nitrogen in the rumen fluid of experimental cows was significantly reduced. The use in the rations of cows in the second 100 days of lactation of different levels of mixed-ligand complexes of Zinc, Manganese and Cobalt did not show a significant influence on the formation of volatile fatty acids in the rumen fluid, however, there was a tendency to increase them at lower concentrations of these trace elements.
Cows of the experimental groups better digested dry and organic matter, crude protein, crude fat, crude fiber and NFES. The recommended and accepted norms of the dose of microelements used in the control group did not show the highest influence on the coefficients of digestibility of nutrients in feed mixtures compared with their lower doses in the experimental groups.
It was found that the increase in the transformation of Nitrogen into the milk protein of cows of the experimental groups was contributed by better digestibility and less excretion of Nitrogen in the urine, which is one of the main factors in increasing their milk productivity.
The elimination of zinc, manganese and cobalt deficiency in the ration of high-yielding cows due to lower doses of their mixed-ligand complexes has a positive influence on the digestibility of nutrients in the ration, nitrogen metabolism and productivity of animals.
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