Al-Ghamdi Saleh, Al-Baadani Hani Hasan, Alharthi Abdulrahman S, Suliman Gamaleldin M, Alhidary Ibrahim A
Department of Agricultural Engineering, College of Food and Agriculture Sciences, King Saud University, Riyadh 2460, Saudi Arabia.
Department of Animal Production, College of Food and Agriculture Sciences, King Saud University, Riyadh 2460, Saudi Arabia.
Food Sci Anim Resour. 2025 May;45(3):871-889. doi: 10.5851/kosfa.2025.e10. Epub 2025 May 1.
This study investigates the impact of neutral detergent fiber (NDF) content in pelleted complete diets on the weight gain, carcass characteristics, and meat quality of lambs. A total of 72 lambs (12±1 weeks old) were randomly assigned to three dietary groups: Diet 1 (20.98% NDF), Diet 2 (28.23% NDF), and Diet 3 (32.82% NDF), with 8 replicates as the experimental unit. Weight gain parameters were recorded over 84 days. At the end of the trial, carcass characteristics, body components, wholesale cuts, fat depot metrics, and physical separation were evaluated. In addition, the physical, chemical, and fatty acid profiles of the meat and the qualitative meat characteristics were assessed. All data were analyzed using one-way ANOVA and regression analysis. Lambs fed Diet 2 exhibited superior overall weight gain and improved carcass characteristics, including higher slaughter weight, empty weight, hot carcass weight, cold carcass weight, and carcass compactness index. The amounts of back fat, omental fat, mesenteric fat, meat percentage, and trimmings were also higher in Diet 2 than in the other groups. In terms of meat quality, Diet 2 resulted in lower shear force and a higher myofibril fragmentation index, indicating higher tenderness, along with substantially reduced cooking loss indicating improved meat quality. In addition, lambs fed Diet 2 had higher crude protein and polyunsaturated fatty acids content, while saturated fatty acid content decreased. In conclusion, these findings suggest that an NDF level of 28.23% in lamb diets optimizes weight gain, improves carcass characteristics, and enhances meat quality.
本研究调查了颗粒全价日粮中中性洗涤纤维（NDF）含量对羔羊体重增加、胴体特征和肉质的影响。总共72只羔羊（12±1周龄）被随机分配到三个日粮组：日粮1（NDF含量20.98%）、日粮2（NDF含量28.23%）和日粮3（NDF含量32.82%），以8个重复作为实验单位。在84天内记录体重增加参数。试验结束时，评估胴体特征、身体组成、批发切块、脂肪沉积指标和物理分割情况。此外，还评估了肉的物理、化学和脂肪酸谱以及肉质特征。所有数据均采用单因素方差分析和回归分析。饲喂日粮2的羔羊总体重增加情况更好，胴体特征也有所改善，包括更高的屠宰体重、空腹体重、热胴体重、冷胴体重和胴体紧实度指数。日粮2组的背膘、网膜脂肪、肠系膜脂肪、肉比例和修整量也高于其他组。在肉质方面，日粮2导致剪切力降低，肌原纤维破碎指数升高，表明嫩度更高，同时烹饪损失大幅降低，表明肉质得到改善。此外，饲喂日粮2的羔羊粗蛋白和多不饱和脂肪酸含量更高，而饱和脂肪酸含量降低。总之，这些研究结果表明，羔羊日粮中28.23%的NDF水平可优化体重增加、改善胴体特征并提高肉质。
