African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12269

Full Length Research Paper

Influence of breeds genetic composition on the quality of milk from primiparous cows

Melo, A. F.
  • Melo, A. F.
  • Unidade de Zootecnia, Instituto Federal Goiano - Cmpus Rio Verde, Rodovia Sul Goiana, Km 01, Caixa Postal 66, CEP 75901-970, Rio Verde, Goias, Brazil.
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Silva, M. A. P.*
  • Silva, M. A. P.*
  • Unidade de Zootecnia, Instituto Federal Goiano - Cmpus Rio Verde, Rodovia Sul Goiana, Km 01, Caixa Postal 66, CEP 75901-970, Rio Verde, Goias, Brazil.
  • Google Scholar
Silva, F. R.
  • Silva, F. R.
  • Unidade de Zootecnia, Instituto Federal Goiano - Cmpus Rio Verde, Rodovia Sul Goiana, Km 01, Caixa Postal 66, CEP 75901-970, Rio Verde, Goias, Brazil.
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Carmo, R. M.
  • Carmo, R. M.
  • Unidade de Zootecnia, Instituto Federal Goiano - Cmpus Rio Verde, Rodovia Sul Goiana, Km 01, Caixa Postal 66, CEP 75901-970, Rio Verde, Goias, Brazil.
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, Neves, R. B. S.
  • , Neves, R. B. S.
  • Laboratorio de Qualidade do Leite do Centro de Pesquisa em Alimentos da Escola de Veterinaria e Zootecnia da Universidade Federal de Goias, Campus II da UFG, Rodovia GO-080 (sada para Nova Veneza), CEP 74001-970, Goiania, Goias, Brazil.
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Nicolau, E. S.
  • Nicolau, E. S.
  • Laboratorio de Qualidade do Leite do Centro de Pesquisa em Alimentos da Escola de Veterinaria e Zootecnia da Universidade Federal de Goias, Campus II da UFG, Rodovia GO-080 (sada para Nova Veneza), CEP 74001-970, Goiania, Goias, Brazil.
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Lage, M. E.
  • Lage, M. E.
  • Laboratorio de Qualidade do Leite do Centro de Pesquisa em Alimentos da Escola de Veterinaria e Zootecnia da Universidade Federal de Goias, Campus II da UFG, Rodovia GO-080 (sada para Nova Veneza), CEP 74001-970, Goiania, Goias, Brazil.
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  •  Received: 26 August 2014
  •  Accepted: 25 March 2015
  •  Published: 15 April 2015

Abstract

Forty-four crossbred primiparous cows participated in this study, namely: 15 1/2 animals corresponding to 1/2 Holstein (HO) x 1/2 Gyr; 15 3/4 animals corresponding to (3/4 HO x 1/4 Gyr) and 14 7/8 animals corresponding to (7/8 HO x 1/8 Gyr) raised under similar handling and feeding conditions. The sample collection was carried out between January and March 2013. To compare the quality of milk among breeds genetic compositions, the study was set up in a completely randomized design. Data of variables fat, protein, lactose contents, fat free dry matter (DDE), urea, somatic cell count, electrical conductivity, pH, titratable acidity and production were submitted to analysis of variance using the Tukey test at 5% probability for comparison of means between treatment 1 (1/2 HO x 1/2 Gyr), treatment 2 (3/4 HO x 1/4 Gyr) and treatment 3 (7/8 HO x 1/8 Gyr). Statistical analyses were performed using the SISVAR® - UFLA software. Correlation analysis between variables was performed using the ASSISTAT software. The results demonstrate that the genetic makeup of the different races holstein / Gyr primiparous cows did not affect the quality of the milk produced. The values ​​of the chemical constituents of milk have been considered suitable for human consumption. Titratable acidity and milk production were higher for 3/4 Holstein/Gyr animals.
 
Key words: Protein, electrical conductivity, titratable acidity, Holstein, Gyr.