Differents physical forms of concentrate of Holstein cows / Diferentes formas fÃsicas da raÃÃo para vacas Holandezas

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

The objective was to determine the effect of these three different physical forms of concentrate on milk composition and milk production of lactating cows. This trial was conducted at Bela Vista Farm III, Newton Paiva Empreendimentos Rurais, in Curvelo, MG, Brazil, from October to November, 2001.Twenty seven lactating Holstein cows averaging 20 kg of milk yield (50 days lactation) were used in a 3x3 Latin square design trial, with three treatments and three periods of 14 days each. The three treatments tested were different physical forms of concentrate: (T1) pellet, (T2) meal and (T3) extruded. The diets had the same chemical composition. Cows were selected based on milk production and lactation order. Each experimental period consisted of a 9 day adaptation phase and a five day milk collection window. All cows were fed napier grass and tifton haylage. Milk samples were collected and weighed at two dairy milking every 5-days. The following milk components were determined: fat, solids, lactose, crude protein and urea using the infrared method at the animal production department laboratory, at ESALQ/USP. Treatments did not affect (P<0.05) milk composition, however the extruded form (P<0.05) decreased urea concentrations (mg/dl) (T1) 21.88; (T2) 21.15; (T3) 19.16 and increased milk and 4% fat corrected milk production, showing better milk production performance. Average milk production (kg/cow/day) and 4% fat corrected milk production was (T1) 17.32; (T2) 17.35; (T3) 18.31 and (T1) 15.66; (T2) 15.78 and (T3) 16.81, respectively.

ASSUNTO(S)

zootecnia ration processing produÃÃo de leite consumo processamento da raÃÃo milk production milk composition composiÃÃo do leite consumption

ACESSO AO ARTIGO

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