尼日利亚西南部种植的四个木薯叶品种在绵羊瘤胃中的化学成分及瘤胃内降解特性

Chemical composition and in sacco degradability of four varieties of cassava leaves grown in Southwestern Nigeria in the rumen of sheep.

作者信息

Oni A O, Onwuka C F I, Arigbede O M, Oni O O, Anele U Y, Yusuf K O, Oduguwa B O, Onifade O S

机构信息

Department of Animal Nutrition, College of Animal Science and Livestock Production, University of Agriculture, P.M.B. 2240, Abeokuta, Ogun State, Nigeria.

出版信息

Trop Anim Health Prod. 2010 Oct;42(7):1385-93. doi: 10.1007/s11250-010-9596-0. Epub 2010 Jun 3.

DOI:10.1007/s11250-010-9596-0

PMID:20521108

Abstract

The nutritive value of leaves of four varieties of cassava (MS 6, TMS 30555, Idileruwa and TMS 30572) were studied through analysis of their chemical components and degradability of their dry matter (DM) and crude protein (CP) in the rumen of sheep. Results of the chemical analyses showed that the leaves of the four varieties contained different proportions of organic matter which was significantly (P < 0.05) highest in TMS 30572 with value of 935 g/kg DM, while CP (gram per kilogramme DM) was significantly highest in TMS 30555 (240), followed by MS 6 (235), TMS 30572 (208) and least in Idileruwa (177). Mean metabolisable energy (megajoules per kilogramme DM) was significantly (P < 0.05) highest in TMS 30572 (8.2) and similar with Idileruwa (8.0) but different from TMS 30555 and MS 6, respectively (7.8 and 7.6). The mineral contents (gram per kilogramme DM) showed that leaves of MS 6 and Idileruwa had the highest concentrations of K (2.86) and a significantly lowest value (1.83) in TMS 30555. Also, the highest concentration of Ca and Fe (6.81 and 6.23) was recorded in MS 6. The highest Ca:P of 3.20 was obtained in TMS 30555. DM degradation characteristics and effective degradability varied significantly (P < 0.05) and were consistently highest in TMS 30572. The washing loss (a) ranged from 15.9% in MS 6 to 21.3% in TMS 30572. TMS 30572 tended to have higher (P = 0.546) insoluble but fermentable fraction (b) than all other varieties. Moreover, the potential degradability (a + b) tended to be higher (P = 0.041) in TMS 30572 (69.5%) followed by TMS 30555 (67.1%) and the lowest was in Idileruwa (42.7%). The highest effective degradability was recorded in TMS 30572 (63.9%) and the lowest in Idileruwa (40.7%). The degradation rate constants (c) of Idileruwa was significantly higher (P = 0.001) than those of MS6, TMS 30555 and TMS 30572. The results generally indicated that the leaves could be ranked for their potential feeding value as TMS 30572 (71.5%) > MS6 (65.8%) > Idileruwa (63.0%) > TMS 30555 (50.4%). It is therefore concluded from this study that leaves of TMS 30572 and MS 6 have good potential as feed resources for ruminant animals and could be used in ruminant feeding as protein source ingredient.

摘要

通过分析四种木薯品种（MS 6、TMS 30555、Idileruwa和TMS 30572）叶片的化学成分以及其干物质（DM）和粗蛋白（CP）在绵羊瘤胃中的降解率，对其营养价值进行了研究。化学分析结果表明，四个品种的叶片含有不同比例的有机物，其中TMS 30572的有机物含量最高（935 g/kg DM），差异显著（P < 0.05）；CP含量（每千克DM中的克数）在TMS 30555中最高（240），其次是MS 6（235）、TMS 30572（208），Idileruwa最低（177）。平均代谢能（每千克DM兆焦）在TMS 30572中最高（8.2），与Idileruwa相近（8.0），但与TMS 30555和MS 6不同（分别为7.8和7.6）。矿物质含量（每千克DM中的克数）表明，MS 6和Idileruwa叶片中的钾含量最高（2.86），TMS 30555中的钾含量显著最低（1.83）。此外，MS 6中的钙和铁含量最高（分别为6.81和6.23）。TMS 30555中的钙磷比最高，为3.20。DM降解特性和有效降解率差异显著（P < 0.05），TMS 30572始终最高。洗涤损失（a）范围从MS 6中的15.9%到TMS 30572中的21.3%。TMS 30572的不溶性但可发酵部分（b）往往高于所有其他品种（P = 0.546）。此外，TMS 30572的潜在降解率（a + b）往往更高（P = 0.041），为69.5%，其次是TMS 30555（67.1%），Idileruwa最低（42.7%）。有效降解率最高的是TMS 30572（63.9%），最低的是Idileruwa（40.7%）。Idileruwa的降解速率常数（c）显著高于MS6、TMS 30555和TMS 30572（P = 0.001）。结果总体表明，这些叶片的潜在饲用价值排序为：TMS 30572（71.5%）> MS6（65.8%）> Idileruwa（63.0%）> TMS 30555（50.4%）。因此，本研究得出结论，TMS 30572和MS 6的叶片作为反刍动物的饲料资源具有良好潜力，可作为蛋白质源成分用于反刍动物饲养。