Feedlot confined crossbreed steers fed with different forage to concentrate ratios. 1. Apparent nutrient digestibilities, weight gain and feed : gain ratio

Resende, F.D. de; Queiroz, A.C. de; Oliveira, J.V. de; Pereira, J.C.; Mancio, A.B.

Revista Brasileira de Zootecnia 30(1): 261-269

2001


ISSN/ISBN: 1516-3598
Accession: 003445903

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Abstract
The effects of the forage to concentrate ratio on the weight gain and feed:gain were evaluated and the apparent digestibility of the nutrients of 25 and 20 crossbred steers averaging 310 kg liveweight (LW) was determined. Five full-fed diets based on tanzania grass hay and concentrate, with different forage to concentrate ratio (85:15, 70:30, 55:45, 40:60, and 25:75) were used. The regression analysis of the coefficients of apparent digestible dry matter, digestible organic matter, neutral detergent fibre, digestible protein and gross energy in function of the concentrate level in the diets, presented quadratic effects. The maximum estimated coefficients were 67.0, 70.0, 51.0, 42.0, 74.0 and 69.0%, for levels of 54, 58, 28, 12, 34 and 77% of concentrate in the diets, respectively. The average daily gain (ADG) increased with the increase of concentrate level in the diets. There was an increase of 0.0 0895 kg/day in the ADG for each percent increase in the concentrate level in the diets, from 15.0 to 75.0%. In the same range, the feed:gain of DM, CP and GE increased 0.08, 0.011468, and 0.50646, respectively, for each percent increase in the concentrate level in the diets. The maximum nutrient digestion for the maximum efficiency of nutrient utilization, occurred with intake of neutral detergent fibre ranging from 1.25 to 1.02% LW for crossbred steers.