Productive performance and carcass characteristics of lambs grazing on pastures of two cultivars of buffel grass and three forage allowance

SUMMARY The objective of this present trial was to evaluate the forage intake, productive performance of lambs (average daily gain, total weight gain and final body weight), the carcass characteristics (hot carcass weight and hot carcass dressing), besides stocking rate and weight gain by area of buffel grass pastures (Cenchrus ciliaris L.) grazing by lambs. This trial was carried out during September 2009 to Ausgust 2010, using continuos stocking. The treatments were combinations of two cultivars of buffel grass (Biloela and Cpatsa 7754) and three forage allowance (4, 8 and 12 kg of dry matter/100 kg of body weight or 4, 8 and 12%) in 3 x 2 factorial arrangement and completely randomized blocks with three replicates. The variables related to forage intake, produtive performance, carcass characteristics, stocking rate and weight gain by area did not affect by cultivars, forage allowance and interation between cultivars and forage allowance. The lambs presented 452,14 g/animal/day of dry matter intake, 59,77 g/animal/day of average daily gain, 41,51 % of hot carcass dressing, while buffel grass pastures had 11,78 lambs/ha and promoted 205,64 kg/ha/year of weight gain.

摘要 本试验旨在评估羔羊的饲草采食量、生产性能（日平均增重、总增重及终末体重）、胴体特性（热胴体重与热胴体屠宰率），同时分析羔羊放牧的非洲狗尾草（Cenchrus ciliaris L.）牧场的载畜率与单位面积增重。本试验于2009年9月至2010年8月开展，采用连续放牧制度。试验处理为2个非洲狗尾草品种（Biloela与Cpatsa 7754）与3个饲草供给水平（4、8、12 kg干物质/100 kg体重，即4%、8%、12%）的组合，采用3×2因子设计并搭配完全随机区组设计，设置3次重复。结果表明，饲草采食量、生产性能、胴体特性、载畜率及单位面积增重均不受品种、饲草供给水平及其交互作用的影响。试验中羔羊的干物质采食量为452.14 g/只·日，日平均增重为59.77 g/只·日，热胴体屠宰率达41.51%；而非洲狗尾草牧场的载畜率为11.78只/公顷，单位面积年增重为205.64 kg/公顷·年。