Department of Animal Science, "Luiz de Queiroz" College of Agriculture, University of São Paulo, Pádua Dias Avenue n 11, PO Box 09, Piracicaba, São Paulo, 13418-900, Brazil.
Department of Nutrition and Animal Production, FMVZ, University of São Paulo, Duque de Caxias North Avenue, n 225, Pirassununga, São Paulo, 13635-000, Brazil.
Trop Anim Health Prod. 2023 Mar 2;55(2):105. doi: 10.1007/s11250-023-03515-5.
Diets without forage increase the productivity in less time and favor greater practicality and better quality carcass. The corn grain is mostly used associated with pellets but processing these ingredients can bring benefits. The present study evaluated the effect of diets without forage based on whole or coarse ground corn associated with pelleted or ground protein supplement on performance, eating behavior, carcass characteristics, and ruminal morphology of feedlot lambs. Thirty-five Dorper × Santa Inês lambs were used, with 23.85 ± 3.88 kg of initial body weight and 88 ± 9 days old. The experimental design was in a randomized complete block, defined by body weight and age. The experimental diets were control (CONT), containing 90% of concentrate and 10% of forage (coastcross hay), and 4 diets without forage: WC+P, 70% whole flint corn and 30% pelleted protein supplement; WC+G, 70% whole flint corn and 30% ground protein supplement; GC+P, 70% ground flint corn and 30% pelleted protein supplement; and GC+G, 70% ground flint corn and 30% ground protein supplement. There was an interaction between treatments and experimental periods for DMI in kg/day (P = 0.01) and g/kg of BW (P < 0.01; Table 3). For the DMI in kg/day, no significant differences were observed between the treatments in any of the experimental periods. However, for DMI expressed in g/kg of BW, the animals fed WC+P had lower DMI than the animals on the CONT (P < 0.01) only in the first period. The ADG, FBW, and FE were not affected by the treatments. Compared to CONT, forage-free diets decreased ingestion time (min/day) and rumination and chewing (min/day and min/g of dry matter). There was no effect of treatments for any of the carcass traits evaluated. The diets did not cause lesions suggestive of ruminitis. Forage-free diets containing whole or ground corn associated with pelleted or ground protein supplement can be used successfully for feedlot lambs; they provide proper performance and carcass characteristics, without harming the animal's health.
无草料日粮可以在更短的时间内提高生产力，并有利于提高实用性和改善胴体质量。玉米谷物通常与颗粒料一起使用，但加工这些原料可以带来好处。本研究评估了基于全玉米或粗磨玉米与颗粒蛋白补充料或粉碎蛋白补充料的无草料日粮对育肥羔羊生产性能、采食行为、胴体特性和瘤胃形态的影响。使用了 35 只杜泊×圣乔治羊，初始体重为 23.85±3.88kg，年龄为 88±9 天。实验设计采用随机完全区组设计，根据体重和年龄划分。实验日粮有对照组（CONT）、无草料日粮 4 种：WC+P，含 70%全粒玉米和 30%颗粒蛋白补充料；WC+G，含 70%全粒玉米和 30%粉碎蛋白补充料；GC+P，含 70%粉碎玉米和 30%颗粒蛋白补充料；GC+G，含 70%粉碎玉米和 30%粉碎蛋白补充料。处理与实验期对干物质采食量（DMI）有交互作用（kg/d，P=0.01；g/kgBW，P<0.01；表 3）。在任何实验期，各组间 DMI（kg/d）均无显著差异。然而，以 BW（g/kg）表示的 DMI，WC+P 组的 DMI 显著低于 CONT（P<0.01），仅在第一期观察到。ADG、FBW 和 FE 不受处理影响。与 CONT 相比，无草料日粮减少了采食时间（min/d）、反刍和咀嚼时间（min/d 和 min/g 干物质）。任何胴体性状评估的处理都没有影响。这些日粮没有引起疑似瘤胃酸中毒的病变。含有全粒或粉碎玉米与颗粒或粉碎蛋白补充料的无草料日粮可成功用于育肥羔羊；它们提供适当的生产性能和胴体特性，而不会损害动物的健康。
