Moore-Colyer M J S, Hyslop J J, Longland A C, Cuddeford D
Institute of Rural Studies, University of Wales Aberystwyth, Llanbadarn Fawr, Aberystwyth SY23 3AL, Ceredigion, Wales, UK.
Br J Nutr. 2002 Dec;88(6):729-40. doi: 10.1079/BJN2002734.
An in sacco mobile bag technique was used to determine the rate and extent of disappearance of unmolassed sugar-beet pulp, soyabean hulls, hay cubes and an oat hull-naked oats mixture (67:33, w/w) in the foregut and total digestive tract of ponies. Ponies were administered naso-gastrically polyester mesh bags containing 350 mg feed, in a Latin square design. Bags were collected at the ileo-caecal junction (small intestine bag, SIB) and in the faeces (faecal bag, FB) and their residues analysed for proximate constituents and NSP composition and content. DM disappearances from individual bags were fitted to degradation profiles (Ørskov & McDonald, 1979) and effective degradability values determined. Significant differences (P<0.05) in DM, organic matter and crude protein losses from SIB were noted between feeds with hay cubes and oat hulls-naked oats > sugar-beet pulp and soyabean hulls. Acid-detergent fibre, neutral-detergent fibre and NSP disappearances were small and varied little between feeds. In contrast, FB losses showed significant (P<0.05) differences for all constituents measured with sugar-beet pulp > soyabean hulls > hay cubes > oat hulls-naked oats. Crude protein losses from sugar-beet pulp and soyabean hulls in FB were significantly higher (P<0.05) than from SIB. FB degradation curves showed degradation to be affected by bag residence time with sugar-beet pulp > soyabean hulls and the effective degradability showed that significantly more (P<0.05) sugar-beet pulp was lost at 40.0 and 60.0 h than for the other three feeds. These results show that sugar-beet pulp and soyabean hulls are rapidly degraded by ponies and could be used as alternatives to hay in equid rations. However, the foregut availability of crude protein from sugar-beet pulp is poor, so a readily digestible source of crude protein should be offered to animals with high protein demands when diets are based on sugar-beet pulp.
采用瘤胃内移动袋技术，测定了未添加糖蜜的甜菜粕、大豆皮、干草块以及燕麦壳-裸燕麦混合物（67:33，w/w）在矮种马前肠和整个消化道中的消失速率及程度。按照拉丁方设计，通过鼻胃管给矮种马投喂装有350毫克饲料的聚酯网袋。在回盲部连接处收集袋样（小肠袋，SIB），并在粪便中收集袋样（粪袋，FB），分析其残余物的常规成分以及非淀粉多糖的组成和含量。将各个袋样中干物质的消失情况拟合至降解曲线（Ørskov和McDonald，1979），并测定有效降解率值。结果发现，与干草块和燕麦壳-裸燕麦相比，甜菜粕和大豆皮在SIB中的干物质、有机物和粗蛋白损失存在显著差异（P<0.05）。酸性洗涤纤维、中性洗涤纤维和非淀粉多糖的消失量较少，且不同饲料间差异不大。相比之下，FB中所有测定成分的损失均存在显著差异（P<0.05），顺序为甜菜粕>大豆皮>干草块>燕麦壳-裸燕麦。FB中甜菜粕和大豆皮的粗蛋白损失显著高于SIB（P<0.05）。FB降解曲线表明，降解受袋停留时间的影响，甜菜粕>大豆皮，有效降解率表明，在40.0和60.0小时时，甜菜粕的损失显著多于其他三种饲料（P<0.05）。这些结果表明，甜菜粕和大豆皮能被矮种马快速降解，可作为马日粮中干草的替代品。然而，甜菜粕中粗蛋白在前肠的可利用性较差，因此，当日粮以甜菜粕为基础时，对于蛋白质需求较高的动物，应提供易于消化的粗蛋白来源。
