Yield and composition of milk from dairy cows fed diets containing cashew nuts1 1 Parte da Tese da primeira autora apresentada ao Doutorado em Zootecnia da Escola de Veterinária da Universidade Federal de Minas Gerais, com financiamento do Banco do Nordeste do Brasil

Produção e composição do leite de vacas leiteiras alimentadas com dietas contendo castanha de caju

Patrícia Guimarães Pimentel Ronaldo Braga Reis José Neuman Miranda Neiva Sandra Gesteira Coelho Andréa Pereira Pinto About the authors

ABSTRACT

This work evaluated the production and composition of milk from dairy cows fed increasing levels of cashew nuts in the concentrate portion of the diet. Eight Holstein multiparous cows were used, between the third and fifth lactation, with an average milk yield of 28.0 ? 4.0 kg day-1, arranged in a double 4 x 4 Latin square experimental design. The assessed diets consisted of including different amounts of ground cashew nuts (CN): 0; 80; 160 and 240 g kg-1 of concentrate portion, which resulted in ether extract contents of 31.6; 46.0; 68.9 and 73.1 g kg-1 of dietary dry matter, respectively. Corn silage was used as the only roughage at a proportion of 50% and diets were formulated to be isoprotein. Diet was offered as a complete mixture. Average milk yield was 30.3 kg day-1. The concentration of protein, N-urea and lactose did not present significant variations (p>0.05) among the diets. The inclusion of 24% of cashew nut in the concentrate portion of the diet, maintains milk production, reduces milk fat content and together with the reduction in the concentration of short chain fatty acids and the increase in the concentrations of long chain fatty acids, provide a greater nutraceutical value to milk, making the use of cashew nut an excellent alternative for obtaining milk with more benefits to human health.

Key words:
Byproduct; Conjugated linoleic acid; Lipids; Milk fat; Milk protein

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