Effect of increasing level of dietary urea in diets for dairy cows on composition and yield of Minas Frescal cheese

  • Adriana Augusto Aquino Universidade Federal de Lavras, Lavras, MG
  • Kleber da Cunha Peixoto Junior Universidade Metodista de São Paulo, São Bernardo do Campo, SP
  • Mirna Lúcia Gigante Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos, Campinas, SP
  • Francisco Palma Rennó Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Nutrição e Produção Animal, Pirassununga, SP
  • Luis Felipe Prada e Silva Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Nutrição e Produção Animal, Pirassununga, SP
  • Marcos Veiga dos Santos Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Nutrição e Produção Animal, Pirassununga, SP
Keywords: Non-protein nitrogen, Milk composition, Cheese yield, Nutrition

Abstract

The aim of this study was to evaluate the substitution of soybean meal for increasing levels of dietary urea on the composition and yield of Minas cheese. For each cheese making process, 15 kg of milk were collected from nine lactating Holstein cows that were arranged in 3 Latin squares. Three diets with sugar cane as roughage were fed for cows and consisted of: A) control diet formulated to provide 100% of the requirements of crude protein (CP), rumen undegradable protein (RUP) and rumen degradable protein (RDP), using soybean meal; B) urea inclusion at 0.75% of dry matter in substitution for soybean meal crude protein equivalent; C) urea inclusion at 1.5% of dry matter in substitution for soybean meal crude protein equivalent. Energy and protein levels of rations comply with NRC (2001), and were isoenergetic and isonitrogenous. When the data were analyzed by simple polynomial regression, no effect of treatments were observed on pasteurized milk composition and milk nitrogen fractions, as well as for cheese composition (pH, moisture,fat,ash, sodium cloride, crude protein, soluble nitrogen in pH 4,6 and in TCA 12%) and cheese yield. Based on the results of this study, it can be concluded that the addition of urea up to 1.5% in dry matter basis in substitution for soybean meal in the diet of Holstein cows did not alter cheese composition and yield.

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Published
2009-08-01
How to Cite
Aquino, A., Peixoto Junior, K., Gigante, M., Rennó, F., Silva, L., & Santos, M. (2009). Effect of increasing level of dietary urea in diets for dairy cows on composition and yield of Minas Frescal cheese. Brazilian Journal of Veterinary Research and Animal Science, 46(4), 273-279. https://doi.org/10.11606/issn.1678-4456.bjvras.2009.26775
Section
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