Zinn R A, DePeters E J
Anim. Sci. Dept., University of California, El Centro 92243.
J Anim Sci. 1991 Dec;69(12):4726-33. doi: 10.2527/1991.69124726x.
A feedlot growth-performance trial and a metabolism trial were conducted to evaluate the comparative feeding value of tapioca pellets (TP). In the growth-performance trial treatments consisted of a steam-flaked corn (SFC)-based finishing diet in which a blend of 86% TP and 14% peanut meal replaced SFC at the rate of 0, 15, or 30% of diet DM. Daily weight gain (P less than .10) and DM intake (P less than .01) were greatest when 15% of the diet DM consisted of TP. Feed/gain increased linearly (P less than .01) with TP substitution into the diet. Treatment effects on carcass merit were small (P greater than .10), except that marbling score was greater with 15% TP than with either 0 or 30% TP. In the metabolism trial involving four Holstein steers, treatments consisted of an 88% concentrate diet containing 67% of either SFC or TP. Ruminal and total tract digestibility of starch was similar (P greater than .10) for SFC and TP, averaging 91 and 99%, respectively. Postruminal (P less than .05) and total tract (P less than .01) digestibility of N was lower for the TP than for the SFC diet. Total tract digestibility of N in TP was 3%. Little, if any, ADF in TP was fermented in the rumen. Total tract digestibility of ADF in TP was 16%. Total tract digestibility of DM (P less than .01) and OM (P less than .05) decreased 7 and 5%, respectively, with TP substitution for SFC. Virtually all the difference in OM digestibility could be attributed to differences in ADF excretion. The DE value of the diet decreased 11.5% (P less than .01) with the substitution of TP for SFC. It was concluded that TP can replace up to 30% of the DM in growing-finishing diets without adversely affecting ADG or DM intake of feedlot cattle. Tapioca pellets have approximately 86% the NE value of SFC.
进行了一项饲养场生长性能试验和一项代谢试验，以评估木薯颗粒（TP）的比较饲喂价值。在生长性能试验中，处理组包括以蒸汽压片玉米（SFC）为基础的育肥日粮，其中86%的TP与14%的花生粕混合以日粮干物质（DM）的0%、15%或30%的比例替代SFC。当日粮DM的15%由TP组成时，日增重（P<0.10）和DM摄入量（P<0.01）最大。随着TP替代日粮，料重比呈线性增加（P<0.01）。处理对胴体品质的影响较小（P>0.10），不过大理石花纹评分在TP含量为15%时高于TP含量为0%或30%时。在涉及4头荷斯坦公牛的代谢试验中，处理组包括一种88%的精料日粮，其中含有67%的SFC或TP。SFC和TP的瘤胃及全消化道淀粉消化率相似（P>0.10），平均分别为91%和99%。TP日粮的瘤胃后（P<0.05）和全消化道（P<0.01）氮消化率低于SFC日粮。TP中氮的全消化道消化率为3%。TP中几乎没有酸性洗涤纤维（ADF）在瘤胃中发酵。TP中ADF的全消化道消化率为16%。随着TP替代SFC，DM（P<0.01）和有机物质（OM，P<0.05）的全消化道消化率分别下降7%和5%。OM消化率的几乎所有差异都可归因于ADF排泄的差异。用TP替代SFC后，日粮的消化能（DE）值下降了11.5%（P<0.01）。得出的结论是，TP可替代生长育肥日粮中高达30%的DM，而不会对饲养场牛的平均日增重（ADG）或DM摄入量产生不利影响。木薯颗粒的净能（NE）值约为SFC的86%。
