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Effect of beta-lactoglobulin polymorphism and seasonality on bovine milk composition

Published online by Cambridge University Press:  12 May 2008

Bruno G Botaro ,
Ygor V R Lima ,
Adriana A Aquino ,
Raquel H R Fernandes ,
José F Garcia  and
Marcos V Santos
Bruno G Botaro
Affiliation:
Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Duque de Caxias Norte, 225, Pirassununga, 13635-900, Brazil
Ygor V R Lima
Affiliation:
Centro Universitário Anhangüera, Faculdade de Medicina Veterinária, Waldemar Silenci, 340, Leme, 13614-370, Brazil
Adriana A Aquino
Affiliation:
Universidade Federal de Lavras, Faculdade de Zootecnia, PO Box 3037, Minas Gerais, 37200-000, Brazil
Raquel H R Fernandes
Affiliation:
Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Duque de Caxias Norte, 225, Pirassununga, 13635-900, Brazil
José F Garcia
Affiliation:
Universidade Estadual Paulista Júlio de Mesquita Filho, Laboratório de Bioquímica e Biologia Molecular Animal, Clóvis Pestana, 793, Araçatuba, 16050-680, Brazil
Marcos V Santos*
Affiliation:
Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Duque de Caxias Norte, 225, Pirassununga, 13635-900, Brazil
*
*For correspondence; e-mail: [email protected]
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Abstract

The objective was to evaluate the effect of β-lactoglobulin (β-lg) polymorphism and seasonality on milk composition (fat, lactose, total solids, milk urea nitrogen, total protein, true protein, casein and somatic cell counts) of Holstein and Girolando cows. Milk and blood samples from 278 Holsteins cows and 156 Girolando cows were taken during two dry seasons and two rainy seasons, for milk composition analysis and to determine β-lg genotypes, respectively. BB genotype was the most frequent for both breeds, followed by AA genotype for Holstein (BB>AA>AB) and by AB for Girolando cows (BB>AB>AA). No differences were found in milk compositional characteristics among genetic variants of β-lg (AA, AB and BB) either between Holstein or Girolando cows. No association between milk composition and β-lg genetic polymorphism was observed. During the dry season, independently of the breed considered, higher contents of lactose, true protein, casein and casein:true protein ratio were found.

Keywords

Milk proteinβ-lactoglobulingenetic variantsseasonality
Type
Research Article
Information
Journal of Dairy Research , Volume 75 , Issue 2 , May 2008 , pp. 176 - 181
Copyright
Copyright © Proprietors of Journal of Dairy Research 2008

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