Published in Scientific Papers. Series D. Animal Science, Vol. LXV, Issue 1
Written by Nikolay MARKOV, Miroslav HRISTOV, Tsvetomira BANCHEVA, Svetoslava STOYCHEVA, Tsvetelina DIMITROVA, Lora MONDESHKA
The milk productivity of cows from 'Bulgarian Rhodope cattle’, reared on the farm of the Experimental Base of the Research Institute of Mountain Stockbreeding and Agriculture, Troyan and the farm of Deyan Filipov, in the town of Strazhitsa, was analyzed. Milk productivity, physicochemical composition, dry matter, dry fat-free residue (DFR) and energy value of milk were studied. The percentage of dry matter is a generalizing, constant feature that determines the concentration of cow’s milk. The live weight of the studied animals was also determined. The biological efficiency and the coefficient of biological sufficiency of milk were calculated by formulas. The physicochemical parameters of milk of the studied animals of both genotypes showed different values. Live weight of cows bred in the area of the town of Troyan is higher than that of those reared in the area of the town of Smolyan by 27.55 kg. The coefficients for biological efficiency and biological sufficiency show that cows with a genotype typical of the region of the town of Strazhitsa gave more food production per 1 kg of live weight.
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