Department of Animal Nutrition, College of Animal Science and Livestock Production, University of Agriculture, Abeokuta, Ogun State, Nigeria.
J Anim Physiol Anim Nutr (Berl). 2011 Oct;95(5):583-90. doi: 10.1111/j.1439-0396.2010.01086.x. Epub 2010 Nov 22.
The nutritive value of leaves of four varieties of cassava - MS 6, TMS 30555, Idileruwa and TMS 30572 was evaluated based on their chemical composition and in vitro fermentation. Crude protein (CP) contents of cassava leaves ranged from 177 to 240 g/kg dry matter (DM), with TMS 30555 showing the highest CP contents. Neutral detergent fibre (NDFom) and acid detergent fibre (ADFom) contents of cassava leaves ranged from 596 to 662 and 418 to 546 g/kg DM respectively. Condensed tannin (CT) and hydrocyanic acid contents ranged from 1.0 to 3.8 g/kg and 58.5 to 86.7 mg/kg DM respectively. The range of volatile fatty acids (VFA) in the supernatant after in vitro incubation of the cassava varieties was: acetate (14.7-31.5 mmol/l); propionate (4.5-6.3 mmol/l); butyrate (3.1-3.9 mmol/l); valerate (0.4-0.6 mmol/l); iso-butyrate (0.6-1.3 mmol/l); iso-valerate (1.1-1.9 mmol/l). The acetate:propionate ratio resulting from fermentation of TMS 30555 was higher(p < 0.05) than that of the other leaves. The highest in vitro gas production of 50.5 ml/200 mg DM was recorded for MS6 being higher (p < 0.05) than for TMS 30572, but similar to TMS 30555 and Idileruwa. The DM, CP, ADF and HCN contents of cassava leaves were positively correlated with gas production, while CT content was negatively correlated with gas production. The study showed that leaves of the varieties MS 6 and TMS 30555 are superior to the others in terms of CP and gas production indicating a higher digestibility and energy content and thus nutritive potential. They may therefore serve as supplements for ruminants fed on poor roughages.
四种木薯品种（MS6、TMS30555、Idileruwa 和 TMS30572）叶片的营养价值基于其化学成分和体外发酵进行了评估。木薯叶片的粗蛋白（CP）含量范围为 177-240g/kg 干物质（DM），其中 TMS30555 的 CP 含量最高。木薯叶片的中性洗涤纤维（NDFom）和酸性洗涤纤维（ADFom）含量分别为 596-662g/kg DM 和 418-546g/kg DM。单宁酸（CT）和氢氰酸（HCN）含量分别为 1.0-3.8g/kg 和 58.5-86.7mg/kg DM。体外发酵后，不同木薯品种上清液中挥发性脂肪酸（VFA）的范围为：乙酸（14.7-31.5mmol/L）；丙酸（4.5-6.3mmol/L）；丁酸（3.1-3.9mmol/L）；戊酸（0.4-0.6mmol/L）；异丁酸（0.6-1.3mmol/L）；异戊酸（1.1-1.9mmol/L）。TMS30555 发酵产生的乙酸：丙酸比值（p<0.05）高于其他叶片。MS6 的体外最大产气量为 50.5ml/200mg DM，高于 TMS30572（p<0.05），但与 TMS30555 和 Idileruwa 相似。木薯叶片的 DM、CP、ADF 和 HCN 含量与产气量呈正相关，而 CT 含量与产气量呈负相关。研究表明，MS6 和 TMS30555 这两个品种的叶片在 CP 和产气量方面优于其他品种，表明其消化率和能量含量较高，营养价值较高。因此，它们可能作为反刍动物采食低质粗饲料的补充饲料。
