Study of coagulation properties of Holstein cow’s milk depending on the level of milk urea nitrogen in Macedonia dairy farms

Karapetkovska-Hristova, Vesna and Ahmad, M. Ayaz and Tomovska, Julijana and Bogdanova Popov, Biljana (2014) Study of coagulation properties of Holstein cow’s milk depending on the level of milk urea nitrogen in Macedonia dairy farms. International Journal of Enhanced Research in Science Technology & Engineering, 3 (3). pp. 522-529. ISSN 2319-7463

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Abstract

Abstract: In this paper an attempt has been made to obtain some investigations for coagulation properties of milk produced by Holstein-Friesian cows reared on local Pelagonia’s farms in the R. Macedonia. Based on an initial screening in a herd of 60 Holstein-Friesians, the twenty five individual Holstein-Friesian cows were selected for good and poor chymosin - induced coagulation properties. These 25 selected cows were followed and re-sampled on several occasions to evaluate possible changes in coagulation properties according to the milk urea nitrogen level. We formed two groups of cow’s milk amongst 25 cows, group with normal milk urea nitrogen level, (< 6.2 mile-mol/L) and with high milk urea nitrogen level (> 6.2 mile-mol/L) . In the follow-up study, the milk samples were analyzed for average values, such as DMY, MUN- milk urea nitrogen, (mile-mol/L), lactose, protein and fat content (%), SNF- solids non fat (%) somatic cell count, pH, titratable acidity (Soxhlet-Henkel acidity, 0SH), as well as the rennet coagulation properties. The study describes the action of rennet on Holstein -Friesian breed cow’s milk with normal and high milk urea nitrogen level, as well as the effect of pH and temperature on the coagulum development. Finally, the present investigations were undertaken to obtain a better insight into the problem of rennet coagulation properties of Holstein-Friesian cow’s milk, based on the level of milk urea nitrogen content. Keywords: Holstein- Friesian breed, DMY, Milk Urea Nitrogen (MUN) level, rennet coagulation properties.

Item Type: Article
Subjects: Scientific Fields (Frascati) > Agricultural Sciences > Animal and diary science
Divisions: Faculty of Biotechnical Sciences
Depositing User: prof. d-r Vesna Karapetkovska - Hristova
Date Deposited: 10 Apr 2020 23:08
Last Modified: 10 Apr 2020 23:08
URI: http://eprints.uklo.edu.mk/id/eprint/4937

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