Department of Animal Nutrition, University of Veterinary and Animal Sciences, Lahore, 54000, Pakistan.
Department of Physiology, University of Veterinary and Animal Sciences, Lahore, 54000, Pakistan.
Trop Anim Health Prod. 2023 Apr 25;55(3):172. doi: 10.1007/s11250-023-03578-4.
This study aimed to evaluate the effects of replacing soyhulls (SH) for ground Rhodes grass hay (RGH) in a pelleted diet on ingestive behavior, digestibility, blood metabolites, growth performance, and economic viability of fattening Lohi lambs. A total of thirty male lambs (age: 5 months; body weight 20.4 ± 0.24 kg) were allotted to one of the three diets (n = 10 lambs/diet) under a completely randomized design. The diets were with 25% RGH inclusion (control), replacing 15% RGH with 15% SH as a fiber source (SH-15), and containing only 25% SH inclusion on a dry basis (SH-25). Ingestive behavior parameters like time spent (min/day), bouts frequency (number/day), and bout length (min/bout) for feeding, drinking, rumination, chewing, standing, and lying were not influenced (P > 0.05) by replacing RGH with SH. The dry matter (DM) and neutral detergent fiber (NDF) chewing rate, rumination rate, and feeding efficiency were also not changed (P > 0.05) by dietary treatments, whereas total dry matter and NDF intakes, and their rumination efficiencies were lower (P < 0.05) for the SH-25 than for the rest of the treatments. The digestibility of NDF and acid detergent fiber (ADF) was higher (P < 0.05) for the SH-25 than for the rest of the treatments. The concentrations of blood metabolites like glucose, blood nitrogen, and cholesterol were not changed (P > 0.05) among the treatment groups. Similarly, performance parameters like dry matter intake, initial and final body weight, average daily gain, and feed conversion ratio were similar (P > 0.05) across the treatments. However, the incidence of loose fecal consistency was higher (P < 0.05) for SH-25 than for the control. The values of economic efficiency were better for SH-25-fed lambs than those fed the rest of the treatments. Based on the results, substituting SH for RGH in a pelleted diet improved the digestibility of fiber fractions, and economics without affecting the growth performance, and blood metabolites of fattening lambs. However, lower rumination efficiency and loos fecal consistency are evidencing less effectiveness of SH fiber.
本研究旨在评估在颗粒饲料中用大豆壳（SH）替代地面罗兹草干草（RGH）对育肥洛矶羔羊采食行为、消化率、血液代谢物、生长性能和经济可行性的影响。总共 30 只雄性羔羊（年龄：5 个月；体重 20.4±0.24kg）被随机分配到三种日粮中的一种（n=10 只羔羊/日粮），采用完全随机设计。日粮中分别含有 25%的 RGH （对照组）、15%的 RGH 用 15%的 SH 替代（纤维源 SH-15）、以及仅以干物质基础计 25%的 SH （SH-25）。替代 RGH 用 SH 对采食、饮水、反刍、咀嚼、站立和躺卧的时间（min/天）、频次（次/天）和时间（min/次）等采食行为参数没有影响（P>0.05）。干物质（DM）和中性洗涤纤维（NDF）咀嚼率、反刍率和采食效率也不受日粮处理的影响，而 SH-25 的总干物质和 NDF 采食量及其反刍效率较低（P<0.05）。SH-25 的 NDF 和酸性洗涤纤维（ADF）消化率较高（P<0.05）。血液代谢物如葡萄糖、血液氮和胆固醇的浓度在各组之间没有变化（P>0.05）。同样，干物质采食量、初始和终体重、平均日增重和饲料转化率等性能参数在各组之间也相似（P>0.05）。然而，SH-25 的粪便松软发生率较高（P<0.05）。SH-25 羔羊的经济效益优于其他处理组。基于研究结果，在颗粒饲料中用 SH 替代 RGH 可提高纤维成分的消化率和经济效益，而不会影响育肥羔羊的生长性能和血液代谢物。然而，反刍效率较低和粪便松软表明 SH 纤维的效果较差。
