摘要
This trial was conducted to study the effects of replacing corn with increasing levels of cassava starch by-products on carcass and meat characteritics for fedlot young bulls. Percentages of substitution were 0, 25, 50, 75, and 100, in dry matter basis. Forty crossbred bulls (½ and ¾ Bos taurus x Bos índicus), averaging 21 months old and 363 kg of initial body weight and 570 kg of final body weight were assigned to a block design with eight replicates by treatment. No effect of treatment on carcass traits was detected. The averages were as follows: carcass yield, 54.79%; conformation, 12.32 (good +); carcass length, 132.5 cm; cushion thickness, 28.12 cm; ribeye area, 79.25 cm2; porcentages of bone, 15.51%, of muscle, 64.12%, and of fat, 20.85%; muscle + fat/bone relation , 5.52; edible portion percentage, 85.07%; fat thickness, 4.02 mm; and marbling, 3.9 (light -). No effect of treatment on chemical composition of meat was detected, with averages of 1.01; 19.16 and 2.24%, respectively, for ash, protein, and fat. There was significant difference for humidity, with higher percentage for 50% replacement diet (74.67%) and lower for 25% replacement diet (72.89%). The other treatments had intermediate values. No treatment effects were observed and mean values for the studied traits indicate that the obtained carcasses fulfill the expected requirements of market.
摘要译文
这项试验旨在研究与副产品胴体和肉类特色为对fedlot年轻的公牛增加木薯淀粉含量取代玉米的影响。取代的百分比分别为0，25，50，75，和100，在干物质的基础上。四十杂交公牛（½和¾普通牛X瘤牛）平均21个月旧363公斤的初始体重和570公斤的最终体重被分配到一组设计，8次重复进行处理。检测治疗对胴体性状没有影响。平均值分别为：屠宰率，54.79％;构，12.32（不错）;胴体长，132.5厘米;垫层厚度，28.12厘米;眼肌面积，79.25厘米SUP 2 / SUP;骨骼肌肉，64.12％的，15.51％，对porcentages和脂肪，20.85％;肌肉脂肪/骨骼的关系，5.52;可食部分比例，85.07％;脂肪厚度，4.02毫米;和大理石花纹，3.9（光 - ）。检测处理对肉的化学组成没有影响，具有1.01的平均值; 19.16和2.24％，分别为灰分，蛋白质和脂肪。有对湿度显著差异，具有50％置换饮食较高百分比（74.67％）和较低的25％置换饲料（72.89％）。其他处理过的中间值。未观察到治疗效果和平均值为所研究的性状表明所获得的屠体满足市场的预期要求。
ABRAHAO, José Jorge dos Santos; PRADO, Ivanor Nunes do; PEROTTO, Daniel ; MOLETTA, José Luiz. Effects of replacing corn with increasing levels of cassava starch by-products on carcass characteristics and meat for young bulls[J]. Revista Brasileira de Zootecnia, 2005,34(5): 1640-1650