Influence of race and crossbreeding on casein micelles size |
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| Authors: | Denise R. Freitas Leorges M. Fonseca Fernando N. Souza Cristiane V. G. Ladeira Soraia A. Diniz João Paulo A. Haddad Diêgo S. Ferreira Mônica M. O. P. Cerqueira |
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| Affiliation: | 1. Department of Veterinary Preventive Medicine, Federal University of Minas Gerais, Brazil, Belo Horizonte, Brazil;2. Technology and Inspection of Animal Products, Federal University of Minas Gerais, Brazil, Belo Horizonte, Brazil;3. Pharmaceutical Products, Federal University of Minas Gerais, Brazil, Belo Horizonte, Brazil |
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| Abstract: | Casein (CN) micelles are colloidal aggregates of protein dispersed in milk, the importance of which in the dairy industry is related to functionality and yield in dairy products. The objective of this work was to investigate the correlation of milk CN micelles diameter from Holstein and Zebu crossbreds with milk composition (protein, fat, lactose, total and nonfat solids and milk urea nitrogen), somatic cell count (SCC), age, lactation stage and production. Average casein micelles diameters of milk samples obtained from 200 cows were measured using photon correlation spectroscopy and multiple regression analysis was used to find relationship between variables. CN micelle diameter, SCC and nonfat solids were different between animals with different Holstein crossbreed ratios, which suggests influence of genetic factors, mammary gland health and milk composition. Overall, results indicate the potential use of CN micelle diameter as a tool to select animals to produce milk more suitable to cheese production. |
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| Keywords: | milk urea nitrogen nonfat solids protein somatic cell count |
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