Abstract In Brazil, much of the sheep farming is practiced with native breeds or crossbred with specialized breeds. The market is growing and to serve consumers it is necessary to regularly provide quality meat. Rearing these animals with lower production costs can be achieved using feed efficiency and growth information, useful to define the most appropriate crossbreed for both farm structures and breeder’s objectives. Thus, the objective of the present work was to evaluate the growth, carcass traits and Kleiber ratio (KR) of, respectively, 44 and 39 animals slaughtered at 120 (120D) and 240 days (240D) of the following crosses: Dorper x Morada Nova females and males (F_DMN, M_DMN), Dorper x Santa Ines females and males (F_DSI, M_DSI), and Dorper x Rabo Largo females and males (F_DRL, M_DRL). The traits evaluated were: the weight of the rib, loin, left half carcass, shoulder, leg, Longissimus Dorsi muscle area (LDM), growth curve and KR. Univariate and multivariate analyses were used, and it was observed, at 120D, that DSI and M_DRL had higher cut weights. There was the superiority of the M_DSI in relation to the others for the cuts rib, loin (excerpt with DRL that was similar), half carcass and shoulder at 240D. At 240D all crossbreeds have a value greater than 100 % of the percentage of their asymptotic weight, except the M_DSI. At 240D the animals tended to lower values of KR compared to 120D. Differences were observed between the crosses considering the variables simultaneously. In the grouping at 120D, an approximation between DSI and M_DRL was observed. The DMN at 240D, have lower values for carcass traits and growth and superiority for KR and degree of maturity. The M_DRL with F_DRL and F_DSI were characterized as intermediate for growth, carcass, and KR. In PCA1 at 120D, most of the explanation for differentiating crosses are concentrated in meat cuts. At 240D again, the carcasses contributed to differentiate the crosses, however sharing with the parameters of growth. It is concluded that animals should be slaughtered before 240D. If it is used to slaughter 120D, the cattle rancher can choose, when economically feasible, to slaughter animals regardless of sex and crossing, however, the farmers must be attentive only to prioritize the DSI and M_DRL as an alternative to serving the consumer market that prefers heavier cuts.

中文翻译：

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杜泊与巴西本土无毛绵羊品种杂交的生长曲线、胴体性状和克莱伯比率

摘要 在巴西，大部分绵羊养殖采用本地品种或与专业品种杂交。市场正在增长，为了服务消费者，有必要定期提供优质肉类。可以使用饲料效率和生长信息以较低的生产成本饲养这些动物，这有助于确定最适合农场结构和饲养员目标的杂交品种。因此，本工作的目的是评估分别在以下杂交的 120 (120D) 和 240 天 (240D) 屠宰的 44 和 39 只动物的生长、胴体性状和克莱伯比率 (KR)：Dorper x Morada Nova 雌性和雄性（F_DMN、M_DMN）、Dorper x Santa Ines 雌性和雄性（F_DSI、M_DSI）和 Dorper x Rabo Largo 雌性和雄性（F_DRL、M_DRL）。评估的性状是：肋骨、腰部、左半胴体、肩部、腿部、背最长肌面积 (LDM)、生长曲线和 KR。使用单变量和多变量分析，观察到在 120D 时，DSI 和 M_DRL 具有更高的切割权重。M_DSI 相对于其他切割肋骨、腰部（与 DRL 相似的摘录）、半胴体和肩部在 240D 方面具有优势。在 240D 处，除 M_DSI 外，所有杂交品种的值都大于其渐近权重百分比的 100%。在 240D 时，与 120D 相比，动物倾向于降低 KR 值。同时考虑变量的杂交之间观察到差异。在 120D 的分组中，观察到 DSI 和 M_DRL 之间的近似值。240D 的 DMN 具有较低的胴体性状和 KR 和成熟度的生长和优势值。带有 F_DRL 和 F_DSI 的 M_DRL 被表征为生长、胴体和 KR 的中间体。在 120D 的 PCA1 中，区分杂交的大部分解释都集中在切肉上。再次在 240D 时，胴体有助于区分杂交，但与生长参数共享。结论是动物应该在240D之前屠宰。如果用于屠宰 120D，牧场主可以在经济可行的情况下选择屠宰动物，不分性别和杂交，但是，农民必须注意仅优先考虑 DSI 和 M_DRL 作为服务消费市场的替代方案喜欢较重的切口。再次在 240D 时，胴体有助于区分杂交，但与生长参数共享。结论是动物应该在240D之前屠宰。如果用于屠宰 120D，牧场主可以在经济可行的情况下选择屠宰动物，不分性别和杂交，但是，农民必须注意只优先考虑 DSI 和 M_DRL 作为服务消费市场的替代方案喜欢较重的切口。再次在 240D 时，胴体有助于区分杂交，但与生长参数共享。结论是动物应该在240D之前屠宰。如果用于屠宰 120D，牧场主可以在经济可行的情况下选择屠宰动物，不分性别和杂交，但是，农民必须注意只优先考虑 DSI 和 M_DRL 作为服务消费市场的替代方案喜欢较重的切口。