Animal Science and Genetics, Tasmanian Institute of Agriculture, School of Land and Food, Faculty of Science, Engineering and Technology, University of Tasmania, Private Bag 54 Sandy Bay, Hobart, TAS 7001 Australia.
Animal Science and Genetics, Tasmanian Institute of Agriculture, School of Land and Food, Faculty of Science, Engineering and Technology, University of Tasmania, Private Bag 54 Sandy Bay, Hobart, TAS 7001 Australia ; Institut National Supérieur des Sciences Agronomiques de l'alimentation et de l'environnmente (AGROSUP), 26 Bd du Docteur Petitjean, BP 87 999, 21079 Dijon Cedex, France.
J Anim Sci Technol. 2015 Oct 1;57:36. doi: 10.1186/s40781-015-0069-x. eCollection 2015.
This study examined the effects of dietary supplementation with rice bran, sire breed and gender on live animal performance and carcass characteristics in Australian crossbred and purebred Merino lambs.
Forty-eight lambs balanced by sire breed (Dorset, White Suffolk, Merino) and gender (ewe, wether) were randomly allocated into three dietary supplementation groups (Control- 24 lambs fed wheat/barley-based pellets, Low- 12 animals fed a 50/50 ratio of wheat-based/rice bran pellets, and High- 12 lambs fed rice bran pellets). The Rice bran pellets replaced 19 % of the barley component of the feed. Animals were group-fed at the rate of 1000 g of the supplement per head per day with ad libitum access to lucerne hay as the basal diet and water. The duration of the feeding trial was 49 days with an initial 21-day adjustment period.
Sire breed differences were evident for initial (p < 0.0002) and final (p < 0.0016) liveweights, hot carcass (p < 0.0030) and cold carcass (p < 0.0031) weights, as well as dressing percentage (p < 0.0078), fat thickness (p < 0.0467), yield grade (p < 0.0470) and rib eye area (p < 0.0022) with purebred Merino under-performing compared to the crossbreds. Concentrate feed conversion efficiency, costs per unit of liveweight gain and over the hooks income were comparable between treatments regardless of the observed trend where the high supplementation group tended to show lower feed intake (745.8 g/day) compared to both the control (939.9 g/day) and low supplementation groups (909.6 g/day). No significant differences (p > 0.05) were observed between treatments for live animal performance, carcass characteristics, gender and their second-order interactions.
Results indicate that Rice bran can be utilised as a cost-effective supplementary feed source in genetically divergent sheep over a 49-day feeding period without detrimental effects on overall live animal performance or carcass characteristics.
本研究旨在探讨米糠的饲用、绵羊品种和性别对澳大利亚杂交和纯种美利奴羔羊活体性能和胴体特征的影响。
将 48 只羔羊按父本品种（道赛特、白萨福克、美利奴）和性别（母羊、去势公羊）均衡分组，随机分配到 3 个饲粮补充组（对照组-24 只羔羊饲喂以小麦/大麦为基础的颗粒料；低水平组-12 只羔羊饲喂 50/50 比例的小麦/米糠颗粒料；高水平组-12 只羔羊饲喂米糠颗粒料）。米糠颗粒料取代了饲料中 19%的大麦成分。动物以 1000g/头/天的比例群饲补充料，自由采食苜蓿干草作为基础日粮和水。饲养试验持续 49 天，初始 21 天为调整期。
父本品种对初始体重（p<0.0002）和最终体重（p<0.0016）、热胴体（p<0.0030）和冷胴体（p<0.0031）重量、屠宰率（p<0.0078）、脂肪厚度（p<0.0467）、产肉等级（p<0.0470）和眼肌面积（p<0.0022）有显著影响，与杂交品种相比，纯种美利奴表现较差。无论高补充组的饲料摄入量有下降趋势（745.8g/天），与对照组（939.9g/天）和低补充组（909.6g/天）相比，浓缩饲料转化效率、单位增重成本和钩上收入在处理之间是可比的。处理之间的活体性能、胴体特征、性别及其二阶相互作用均无显著差异（p>0.05）。
结果表明，在 49 天的饲养期内，米糠可以作为一种具有成本效益的补充饲料来源，用于遗传差异较大的绵羊，对整体活体性能或胴体特征没有不利影响。
