Economic aspects of the aerial part of in natura cassava (Manihot esculenta Crantz) for the nutrition of confined and semi-confined lambs

ABSTRACT The scope of this study was to evaluate the inclusion of raw cassava aerial parts in the diet of lambs in partial substitution of rations, in order to reduce production costs. The experiment was conducted at Sheep Technology Centre (CTO) in Campo Grande City, MS. A sample of 56 lambs from Pantaneiro genetic group was used, 28 males and 28 females, average weight of 18.84kg±2.02kg. The inclusion of PAM decreased the costs by 31.29% for the same category of animal. Among the production systems the semi-feedlot, showed the highest average profitability of 6.4% and a return of 7.99%, compared to the feedlot system, which obtained 0.04% 0.87% profitability and return. In conclusion, the inclusion of the aerial part of cassava increases the economic efficiency of production systems without affecting the development of finishing animals.

摘要 本研究旨在评估鲜木薯地上部部分替代羔羊日粮的应用效果，以降低养殖生产成本。本实验于巴西马托格罗索州坎波格兰德市的绵羊技术中心（Sheep Technology Centre, CTO）开展。试验选取56只潘塔内罗（Pantaneiro）遗传类群的羔羊，其中公母各28只，初始平均体重为18.84±2.02kg。添加木薯地上部可使同类别羔羊的养殖成本降低31.29%。在各养殖生产系统中，半舍饲育肥模式的平均利润率最高，达6.4%，投资回报率为7.99%；相较之下，舍饲育肥系统的利润率为0.04%，投资回报率为0.87%。综上，在羔羊日粮中添加木薯地上部可提升养殖系统的经济效率，且不会影响育肥羔羊的生长发育。