The objective of this experiment was to evaluate mesquite extract as a phytogenic additive or supplementation for improving nutrient digestibility, carcass traits, physical composition, and meat quality in finished sheep on rangeland. The experiment was conducted in a Caatinga rangeland composed of herbaceous, shrub, and tree species. Santa Ines × Dorper F1 crossbred lambs (n=24) were used, with an average initial body weight of 23.1 ± 1.83 kg. A completely randomized design with a 2 × 2 factorial arrangement of supplementation and phytogenic additive was used. Lambs had access to pasture with Caatinga vegetation from 07:00h to 17:00h and then were collected and kept in individual pens. Treatments consisted of four diets: supplementation (non-supplemented or supplemented) and phytogenic additive (not administered or administered). Supplementation consisted of Tifton 85 hay, corn meal, soybean meal and mineral salt offered at 1% of body weight. The additive consisted of 600 mg/mL mesquite pods (Prosopis juliflora (Sw.) DC) provided orally (6 mL/day) to each group receiving the additive. The additive was prepared and administered fresh each day of the feeding period. The phytogenic additive and supplementation increased nutrient digestibility, carcass weight, performance, commercial cuts, external carcass measurements, leg weight, and femoral muscles (p<0.05). Supplementation increased nutrient intake (p<0.05). No differences were observed among treatments (p>0.05) for meat quality parameters. Administration of a phytogenic additive or supplementation are recommended to improve nutrient digestibility, carcass weight, animal performance, commercial cuts, external carcass measurements, leg weight, and femoral muscles in Santa Ines × Dorper F1 crossbred sheep finished on rangeland.

本实验的目的是评估豆科灌木提取物作为植物生长添加剂或补充剂，以改善牧场上绵羊的营养消化率，car体性状，物理组成和肉质。该实验是在由草药，灌木和乔木组成的Caatinga牧场中进行的。使用Santa Ines×Dorper F1杂交羔羊（n = 24），平均初始体重为23.1±1.83 kg。使用完全随机的设计，采用2×2阶乘的补充剂和植物性添加剂。羔羊从07：00h到17：00h可以进入Caatinga植被的牧场，然后将它们收集起来并放在单独的围栏中饲养。治疗方法包括四种饮食：补充（不补充或补充）和植物性添加剂（不施用或不施用）。补充剂包括Tifton 85干草，玉米粉，大豆粉和矿物盐，其含量为体重的1％。该添加剂由600 mg / mL豆科灌木荚（口服Prosopis juliflora（Sw。）DC（6 mL /天）给接受添加剂的每组。制备添加剂并在喂养期间的每一天新鲜给药。植物性添加剂和补充剂可提高营养物质的消化率，car体重量，性能，商品切面，外部car体尺寸，腿部重量和股骨肌肉（p <0.05）。补充增加养分摄入（p <0.05）。处理之间在肉品质参数上没有观察到差异（p> 0.05）。建议使用植物性添加剂或补充剂来改善在牧场上饲养的Santa Ines×Dorper F1杂交绵羊的营养物质消化率，car体重量，动物性能，商业割肉，外部car体尺寸，腿部重量和股骨肌肉。