Forster L A, Fontenot J P, Perry H D, Foster J G, Allen V G
Virginia Polytechnic Institute and State University, Blacksburg 24061.
J Anim Sci. 1991 Apr;69(4):1719-25. doi: 10.2527/1991.6941719x.
Apparent digestibility and nutrient utilization were studied in a digestion and balance trial with 30 wether lambs (BW 32 kg). Lambs were blocked by weight and allotted randomly to five diets with ratios of alfalfa (Medicago sativa L.) to 'Lathco' flatpea (Lathyrus sylvestris L.) hay of 100:0, 75:25, 50:50, 25:75, and 0:100. Alfalfa was harvested in the early bloom stage and flatpea was harvested in the vegetative stage. Digestibilities of DM, NDF, ADF, cellulose, hemicellulose, and energy decreased linearly (P less than .05) as the level of flatpea hay increased to values of 53.3, 32.4, 39.9, 46.0, 40.5, and 52.5%, respectively, for 100% flatpea hay. Nitrogen retention (9 to 15% of intake) was not affected by level of flatpea hay. Ruminal pH, NH3 N, and blood urea N increased linearly (P less than .001) as level of flatpea increased in the diet, apparently a reflection of dietary N level. Calcium excretion decreased linearly (P less than .01) with increased proportions of flatpea hay and was related to dietary intake of Ca. Apparent absorption and retention showed a cubic effect (P less than .05). No clinical signs of toxicity were observed in any of the lambs during the 20-d metabolism trial. Vegetative flatpea is potentially valuable as a forage for feeding ruminants.
在一项消化与平衡试验中，对30只体重32千克的去势羔羊进行了表观消化率和养分利用率的研究。羔羊按体重进行分组，然后随机分配到五种日粮中，苜蓿（紫花苜蓿）与“Lathco”扁茎豌豆（林生山黧豆）干草的比例分别为100:0、75:25、50:50、25:75和0:100。苜蓿在初花期收割，扁茎豌豆在营养期收割。随着扁茎豌豆干草水平的增加，干物质、中性洗涤纤维、酸性洗涤纤维、纤维素、半纤维素和能量的消化率呈线性下降（P<0.05），对于100%扁茎豌豆干草，其消化率分别降至53.3%、32.4%、39.9%、46.0%、40.5%和52.5%。氮保留量（摄入量的9%至15%）不受扁茎豌豆干草水平的影响。随着日粮中扁茎豌豆水平的增加，瘤胃pH值、氨氮和血尿素氮呈线性增加（P<0.001），这显然反映了日粮氮水平。随着扁茎豌豆干草比例的增加，钙排泄量呈线性下降（P<0.01），且与日粮钙摄入量有关。表观吸收和保留呈现三次效应（P<0.05）。在为期20天的代谢试验中，未在任何羔羊身上观察到中毒的临床症状。营养期的扁茎豌豆作为反刍动物的饲料具有潜在价值。
