PHENOTYPIC VARIABILITY OF INDIVIDUAL COAGULATION ABILITY OF MILK IN HOLSTEIN CATTLE IN BULGARIA

Daniela Yordanova, Teodora Angelova, Georgi Kalaydjiev, Vladimir Karabashev, Stayka Laleva, Nikolay Oblakov, Mattino Cassandrо, Yovka Fenerova, Jivko Krastanov

Abstract: The aim of this study was to determine phenotypic variability of signs describing individual coagulation ability of milk in Holstein cattle country. Analyzed were 512 individual milk samples from Holstein cattle. The animals were divided into six farms: farm 1 - 70 cows, farm 2 - 42 cows, farm 3 - 61 cows, farm 4 - 66 cows, farm 5 - 28 cows and farms from 6 - 245 cows. The analysis of an individual coagulation ability of milk was established in the laboratory of Agricultural Institute - Stara Zagora through Computerized Renneting Metter - Polo Trade, Italy. Was used Systat 13 software product, a graphic data processing is done using Excel. It is significant phenotypic variability of the studied traits, like variational coefficient signs during coagulating milk is 0.35 to signs coagulum hardness - 0.39 times and tightness of the coagulum - 0.82. There have been signs mean describing the coagulation ability of milk - time to coagulate the milk - 18.25 min, the coagulum firmness - 29.86 mm and the tight time the coagulum - 1.57 min. There were differences in the studied signs characterizing ability qualities of coagulation coagulum in different farms.

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Date published: 2023-03-09