摘要
The objective of this trial was to evaluate the total replacement of corn with a dry residue extracted from cassava starch on production of crossbred heifers in feedlot. Thirty crossbred heifers averaging 21 months of age and 325 kg of body weight were distributed in two experimental groups and then housed in two stalls. Both groups were submitted to a pre-trial period of 49 days, in which animals received ad libitum sorghum silage and 1.05% of body weight as concentrate (19.67% CP) composed of soybean meal, corn, and urea. In this period, daily weigh gain (DWG) averaged 1.08 kg for both groups. The experimental period lasted 57 days with animals averaging 378 kg of body weight. At the beginning of the experimental period, one group remained receiving the pre-trial diet while the other was fed ad libitum sorghum silage and 1.18% of body weight as concentrate (18.12% CP) containing dry cassava byproduct rather than corn. Daily weight gain was significantly higher for heifers fed corn-based concentrate (0.97 kg) compared to those receiving dry cassava byproduct-based concentrate (0.78 kg). In addition, dry matter intake and feed conversion were both lower on heifers fed the diet containing dry cassava byproduct.
摘要译文
这项试验的目的是评估玉米用干渣从木薯淀粉中提取生产的杂交育肥母牛的总更换。三杂交母牛平均年龄21个月和325公斤的体重分布在两个实验组，然后装在两个档位。两组均提交给了49天，其中动物接受自由采食青贮高粱和体重作为精矿1.05％，前试用期（19.67％CP）豆粕组成，玉米，和尿素。在此期间，每日增重量（DWG）平均1.08千克两组。实验期间持续57天与动物平均378千克体重。在试验期开始时，一组保持接收预审饮食，而另一个被随意喂食高粱青贮和体重1.18％为浓缩物（18。12％CP）含木薯干的副产品，而不是玉米。日增重显著更高母牛饲喂玉米为基础的浓缩液（0。97千克）相比，那些接受木薯干副产品为基础的浓缩液（0.78公斤）。此外，干物质采食量和饲料转化都是在较低的小母牛饲喂含木薯干副产品的饮食。
ABRAHAO, José Jorge dos Santos. Effects of replacing corn with dry cassava by-product on production of feedlot crossbred heifers[J]. Revista Brasileira de Zootecnia, 2006,35(2): 512-518