Resumo

SOUSA, B.M. et al. Estimation of dry matter and neutral detergent fiber intake by grazing dairy cows supplemented with different amounts of concentrate. Arq. Bras. Med. Vet. Zootec. [online]. 2008, vol.60, n.4, pp. 890-895. ISSN 0102-0935.  http://dx.doi.org/10.1590/S0102-09352008000400018.

The intakes of dry matter and neutral detergent fiber (NDF) by crossbred lactating cows were estimated under Brachiaria grazing. Twenty-four cows were allotted in three treatments in order to receive 4, 6, or 8kg of concentrate twice a day, during the milking. The experiment was designed in randomized blocks, being eight blocks with three cows in each. The intake of NDF was 1.1, 1.0, and 1.2 of live weight for cows fed 4, 6, and 8kg of concentrate per day, respectively. The 8kg concentrate treatment produced different results (P<0.05) from the others. The increase of concentrate supply also increased (P<0.05) the total consumption of pasture dry matter, which were 1.8, 1.8, and 2.0% of live weight for cows supplemented with 4, 6, and 8kg of concentrate per day, respectively. It was concluded that high level of concentrate offered to lactating cows under tropical grazing induced a greater intake of total pasture dry matter and NDF, regarding the live weight.

Palavras-chave : dairy cow; Brachiaria; intake; supplementation.