R. Bras. Zootec.01/Jun/2003;32(3):690-8.
Performance of beef calves fed with different protein sources associated with silage of sorghum harvested in two different heights
DOI: 10.1590/S1516-35982003000300021
Three protein sources (urea – U; feather meal – Fm; soybean meal – Sm) associated to two sorghum silage (sorghum at high cutting – SHC; and sorghum at low cutting – SLC) were evaluated by measuring beef calf performance, confined for 84 days. Thirty-six crossbred (Charolês/RedAngus/Nelore) castrated calves, with five months of age and average weight alive on the 146.44 kg, were used. Average daily weight gain (DWG); the dry matter intake expressed in kg/day (DMI), percentage live weight (DMILW) and percentage of metabolic weight (DMIMW) and the feed : gain ratio (FGR) were evaluated. The treatments followed a 3×2 factorial in a completely randomized design. There was significant effect in the interaction silage versus protein source for variable DWG, with the higher DWG for SHCFm (1.61 kg/animal/day) versus SLCSm (1.32 kg/animal/day). The other parameters did not differ when the interaction or separately the silage or protein source was analyzed. The sorghum silage high cutting height promoted numerically higher DWG and DMI.
Keywords: feather meal; feedlot; ruminant