Concentrate and crude protein levels in diets for dairy Gyr lineage cows grazing elephant-grass during the rainy season

Revista Brasileira de Zootecnia

Rafael Monteiro Araújo Teixeira²  Rogério De Paula Lana²  Leonardo De Oliveira Fernandes¹  André Soares De Oliveira²  José Maurício De Souza Campos²  Joabe Jobson De Oliveira Pimentel² 

[1] ,UFV Departamento de Zootecnia Viçosa MG

关键词: concentrate ration;    elephant grass;    intake;    milk;    production;    protein;    capim-elefante;    consumo;    leite;    produção;    proteína;    ração concentrada;   

DOI  :  10.1590/S1516-35982011000600025

来源: SciELO

【 摘 要 】

The objective of this work was to evaluate the effects of three levels of concentrate (2.0, 4.0 and 6.0 kg/cow/day) and two levels of crude protein (CP) (14 and 16% total dietary dry matter), in comparison to mineral mixture (control) on the intake, apparent digestibility, milk composition and yield and on feed efficiency and use of concentrates of cows grazing elephant grass (Pennisetum purpureum, Schum) in the rainy season. Twenty-one milking Gyr cows with average body weight of 426 kg and yield of 13.0 kg of milk/cow/day at 55 days of lactation were distributed in randomized blocks design, with seven diets (treatments) in a 3 × 2 + 1 factorial arrangement and three replications, in a period of 84 days. Forage dry matter intake was not influenced by the diets, but total dietary dry matter intake increased by 45% with the inclusion of concentrate in the diet. However, milk yield increased by only 17% (1.76 kg more milk per day) with the use of concentrate. For dairy Gyr cows grazing elephant-grass during the rainy season, 2 kg of concentrate/cow/day and 14% of CP in the total diet provided the best productive response without harming body weight.

【 授权许可】

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