Department of Animal Science, Universidade Federal do Rio Grande do Sul, 7712 - Av. Bento Gonçalves, Rio Grande do Sul, 915400-000, Porto Alegre, Brazil.
Centro de Investigación y Tecnología Agroalimentaria de Aragón, Instituto Agroalimentario de Aragón (IA2-CITA), Avda. Montañana 930, 50059, Zaragoza, Spain.
Trop Anim Health Prod. 2021 Aug 3;53(4):427. doi: 10.1007/s11250-021-02861-6.
The present study assessed the influence of the type of the tropical pastures on lamb body weight (BW) gain and meat quality. Fifty-four lambs were allocated to three grazing pastures: (1) AG - Aruana grass (Panicum maximum cv. IZ-5); (2) PP - pigeon pea legume (Cajanus cajan cv. Anão); and (3) CS - contiguous swards, half of the paddock with AG and half with PP. After 92 days of grazing, the lambs were slaughtered. Carcasses were evaluated and the longissimus muscle was collected to determine color, lipid profile, tocopherol concentrations, and lipid oxidation. Although the pastures present differences in the characteristics of nutritional quality, the animals did not show difference in BW gain. The results show that all forage presented similar concentration of alpha-tocopherol (137 ± 14.37 mg kg of fresh matter), whereas total and condensed tannin contents were greater in PP, intermediate in CS, and the lowest in AG treatment (P = 0.0001). Meat α-tocopherol content was similar among treatments (P = 0.1392), with an average concentration close to the optimal level to reduce the meat oxidation. Meat from AG treatment had 45 and 25% lower n-6/n-3 ratio than meat from PP and CS treatments, respectively. The legume increases the unsaturated fatty acids and the grass can reduce the n6/n3 ratio. The level of condensed tannin concentration did show to have important effect on meat characteristics. Both tropical pastures studied can provide a high amount of alpha-tocopherol, generating a great potential to increase the concentration of this antioxidant in lamb's meat.
本研究评估了热带牧草类型对羔羊体重（BW）增加和肉质的影响。将 54 只羔羊分配到三个放牧草地：（1）AG-阿鲁纳草（Panicum maximum cv. IZ-5）；（2）PP-兵豆豆科植物（Cajanus cajan cv. Anão）；（3）CS-连续草地，牧场的一半是 AG，另一半是 PP。放牧 92 天后，对羔羊进行屠宰。评估胴体，并采集背最长肌以确定颜色、脂质谱、生育酚浓度和脂质氧化。尽管牧草在营养质量特性上存在差异，但动物的 BW 增加没有差异。结果表明，所有饲料的 α-生育酚浓度相似（137±14.37mg kg 新鲜物质），而 PP 的总和浓缩单宁含量较高，CS 中等，AG 处理最低（P=0.0001）。处理之间肉α-生育酚含量相似（P=0.1392），平均浓度接近降低肉氧化的最佳水平。AG 处理的肉中的 n-6/n-3 比例比 PP 和 CS 处理的肉分别低 45%和 25%。豆类增加了不饱和脂肪酸，而草可以降低 n6/n3 比例。单宁浓度水平确实对肉质有重要影响。研究的两种热带牧草都可以提供大量的α-生育酚，为提高羊肉中这种抗氧化剂的浓度提供了巨大潜力。
