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Revista Brasileira de Zootecnia

Print version ISSN 1516-3598On-line version ISSN 1806-9290

Abstract

MORAES, Eduardo Henrique Bevitori Kling de et al. Feeding supplements with different crude protein levels to dairy crossbreed steers on pasture during the transition period between the dry and rainy season. R. Bras. Zootec. [online]. 2006, vol.35, n.5, pp.2135-2143. ISSN 1516-3598.  http://dx.doi.org/10.1590/S1516-35982006000700034.

Two experiments were conducted to evaluate different crude protein (CP) levels of a mixture of mineral and concentrate (multiple supplement) fed to crossbreed steers grazing Panicum maximum cv. Mombaça pasture during the transition between the dry and the rainy season. The multiple supplement contained ground corn and soybean grains and was formulated to yield 8.0, 16.0 or 24.0% of CP. Each animal received 1.0 kg of the multiple supplement per day or only ad libitum mineral mix (control treatment). In the first trial, 20 crossbred steers averaging 19 months of age and 339.4±14.8 kg of body weight were used. The average daily gain (ADG) increased linearly from 0.992 to 1.258 kg/d when the CP level of the supplement increased from 8.0 to 24%. Total weight gain also increased linearly by increasing the CP level of the supplement. Economical analysis of the supplements showed greater gross income for the supplement containing 24% CP. In the second trial, four crossbreed steers fitted with ruminal and esophageal cannulas and averaging 400 kg of body weight were used to investigate different CP levels of the supplements on ruminal pH and ruminal ammonia ruminal concentration. The different CP levels of the supplement did not significantly change ruminal pH. However, ruminal ammonia increased linearly from 8.41 to 12.2 mg/dL when the CP level of the supplement increased from 8.0 to 24%.

Keywords : pH; protein supplementation; ruminal ammonia; sensitivity analysis.

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