Kumari Nagireddy Nalini, Reddy Yerradoddi Ramana, Blummel Michel, Nagalakshmi Devanaboyina, Monika Thamatam, Reddy Belum Venkata Subba, Reddy Chintalapani Ravinder
Department of Animal Nutrition, College of Veterinary Science, S. V. Veterinary University, Hyderabad, Andhra Pradesh, 500 030, India.
Trop Anim Health Prod. 2013 Feb;45(2):649-55. doi: 10.1007/s11250-012-0272-4. Epub 2012 Sep 29.
Different roughage-to-concentrate ratios of sweet sorghum bagasse (SSB) (a by-product of the biofuel industry)-based complete diets were assessed. Twenty four growing Nellore × Deccani ram lambs aged about 3 months (average body wt., 10.62 ± 0.25 kg) were randomly allotted to four complete rations (CR) varying in roughage-to-concentrate ratios viz. 60:40 (CR-I), 50:50 (CR-II), 40:60 (CR-III) and 30:70(CR-IV) for a period of 180 days. The feed intake was comparable among the lambs fed different experimental complete diets. Average daily weight gain (in grams) was 77.31 ± 4.90, 81.76 ± 5.16, 85.83 ± 2.83 and 86.30 ± 3.25, and feed conversion ratio (in kilograms of feed per kilogram gain) averaged 11.42 ± 0.68, 10.57 ± 0.64, 10.17 ± 0.37 and 9.96 ± 0.38 in ram lambs fed CR-I, CR-II, CR-III and CR-IV rations, respectively. Statistically, differences in daily weight gain and feed conversion ratio among the lambs fed four experimental rations were not significant (P > 0.05). The cost per kilogram gain was significantly (P < 0.01) higher in ram lambs fed CR-IV and CR-III rations compared to CR-I ration, and it was comparable between CR-I and CR-II rations. Dressing percentage averaged 44.90 ± 0.15, 42.57 ± 0.72, 43.67 ± 0.16 and 44.42 ± 0.76 for the respective diets. No significant difference and trend was observed in preslaughter weight, empty body weight, carcass weights, dressing percentage, wholesale cuts and edible and non-edible portions of experimental animals. Similarly, no significant variation could be seen in bone and meat yield (in per cent) and their ratios in various wholesale cuts among the dietary treatments. The roughage-to-concentrate ratio did not affect the chemical composition of meat; however, the fat content of meat was linearly increased with increase in the proportion of concentrate in the diets. The results of the experiment indicated that SSB can be included at 60 % level in the complete diet for economical mutton production from growing Nellore × Deccani ram lambs.
评估了以甜高粱渣（生物燃料行业的一种副产品）为基础的全价日粮中不同粗饲料与精饲料比例的情况。将24只约3月龄的生长中的 Nellore×Deccani 公羔羊（平均体重10.62±0.25千克）随机分配到四种粗饲料与精饲料比例不同的全价日粮中，即60:40（CR-I）、50:50（CR-II）、40:60（CR-III）和30:70（CR-IV），为期180天。采食不同实验全价日粮的羔羊采食量相当。平均日增重（克）分别为77.31±4.90、81.76±5.16、85.83±2.83和86.30±3.25，采食量与增重比（每千克增重所需饲料千克数）在采食CR-I、CR-II、CR-III和CR-IV日粮的公羔羊中分别平均为11.42±0.68、10.57±0.64、10.17±0.37和9.96±0.38。统计学上，采食四种实验日粮的羔羊在日增重和采食量与增重比上的差异不显著（P>0.05）。与CR-I日粮相比，采食CR-IV和CR-III日粮的公羔羊每千克增重成本显著更高（P<0.01），而CR-I和CR-II日粮之间相当。各日粮的屠宰率分别平均为44.90±0.15、42.57±0.72、43.67±0.16和44.42±0.76。实验动物的宰前体重、胴体空体重、胴体重、屠宰率、分割肉以及可食和不可食部分均未观察到显著差异和趋势。同样，在不同日粮处理中，骨骼和肉产量（百分比）及其在各分割肉中的比例也没有显著差异。粗饲料与精饲料比例不影响肉的化学成分；然而，肉的脂肪含量随着日粮中精饲料比例的增加呈线性增加。实验结果表明，对于生长中的 Nellore×Deccani 公羔羊进行经济的羊肉生产，甜高粱渣可在全价日粮中以60%的水平添加。
