Interrelationship between the milk urea nitrogen level and milk coagulation traits in Holstein-Friesian cows with reproductive disorders in R. Macedonia

Karapetkovska-Hristova, Vesna and Tomovska, Julijana and Bonev, Georgi and Dimitrov, Stanimir and Dimitrovska, Gordana and Presilski, Stefce and Ahmad, M. Ayaz (2014) Interrelationship between the milk urea nitrogen level and milk coagulation traits in Holstein-Friesian cows with reproductive disorders in R. Macedonia. International Journal of Enhanced Research in Science Technology & Engineering (IJERSTE),, 3 (4). pp. 199-207. ISSN ISSN: 2319-7463

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Abstract

Abstract: The goal of present study is to evaluate some possible effects of the high Milk Urea Nitrogen (MUN) content over the coagulation characteristics of the chosen milk in one dairy farm at R. Macedonia. Therefore, for this task we have studied various analysis of raw milk and technological properties such as: (active acidity - pH, titratable acidity - 0SH, protein and fat content %, the time of initial coagulation and of total coagulation, pH and 0SH of the whey as well the quantity of separated whey in %). In this experimental work, we have included a total of 149 Holstein Friesian cows with reproductive problems with an average service period of 150.92 ± 79.21 days. The samples of milk were divided according to the MUN level into two groups: the group N with n = 10 cows sample (milk urea nitrogen level < 6.50 mile-mol/L) and the group H with n = 15 cows sample (milk urea nitrogen level > 6.50 mile-mol/L). The present surveys were conducted during the period March 2012- March 2013 in one dairy farm in R. Macedonia. The Means, LSD test and correlation coefficients for the investigated characteristics were calculated between the groups N and H dairy cows. And there were statistically significant differences between the average daily milk yield (DMY) (22.27, p < 0.05 for N group and 25.7, p < 0.05 for H group), MUN level (6.22, p < 0.001 for N group and 10.22, p < 0.001 for H group), Time of total coagulation (49.00 min. for N group and 58.26, p < 0.001 for H group) and the Separated quantity of whey (74.94% p < 0.001 for N group and 84.90, p < 0.001 for H group). Keywords: Milk urea nitrogen, technological properties, Holstein Friesian breed, reproductive disorders

Item Type: Article
Subjects: Scientific Fields (Frascati) > Agricultural Sciences > Agricultural biotechnology
Divisions: Faculty of Biotechnical Sciences
Depositing User: prof. d-r Vesna Karapetkovska - Hristova
Date Deposited: 10 Apr 2020 23:07
Last Modified: 10 Apr 2020 23:07
URI: http://eprints.uklo.edu.mk/id/eprint/4935

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