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Milk yield composition properties and technologic qualities of milk of native stara zagora sheep and crossbreds with east friesian rams ii. alteration in milk yield composition and properties of milk during the lactation period


Milk yield composition properties and technologic qualities of milk of native stara zagora sheep and crossbreds with east friesian rams ii. alteration in milk yield composition and properties of milk during the lactation period



Zhivotnov"dni Nauki 25(4): 16-21



Objective of this study was to establish alterations in composition and properties of milk of purebred native Stara Zagora ewes and crossbreds with East Friesian rams, reared in the flock of the institute of cattle and sheep breeding.sbd.Stara Zagora [Bulgaria]. The study was conducted in 1986 with two groups of ewes (40 animals in each) in first lactation, equalized analogically at time of lambing (first week of February). Milk samples were analyzed in the laboratories of the department Dairy Science and Bacteriology of the Higher Institute of Zootechnics and Veterinary Medicine.sbd.Stara Zagora. It was found that: the average milk yield reached highest amounts during the second and third month of lactation both for native Stara Zagora sheep and crossbreds with East Freisian rams. A decrease in milk yield during the last months of lactation was more vividly expressed in purebred ewes. Composition of milk (i.e. fat and total protein percentage) of the two groups underwent changes during the lactation. Variations in casein content were small while NPN values were the more constant. Increase in fat and total protein in milk at the end of lactation was identical for both groups of ewes. The studied groups of ewes did not differ in properties of milk. However, milk of crossbreds showed a slightly higher coagulability.

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