文献类型： 外文期刊

作者： Jin, Yanmei ¹ ; Asad, Muhammad ² ; Zhang, Xiaoqing ³ ; Zhang, Jize ³ ; Shi, Ruizhi ⁴ ;

作者机构： 1.Shandong Univ, Marine Coll, Weihai 264209, Peoples R China

2.Univ Agr Faisalabad, Dept Agron, Agrobiol & Plant Stress Physiol Lab, Faisalabad 38000, Pakistan

3.Chinese Acad Agr Sci, Inst Grassland Res, Hohhot 010010, Peoples R China

4.Tibet Acad Agr & Anim Husb Sci, Inst Practaculture Sci, Lhasa 850000, Peoples R China

关键词： grazing schedule; gastrointestinal tract; muscle fiber; carcass quality

期刊名称：ANIMALS （ 影响因子：3.231； 五年影响因子：3.312 ）

ISSN： 2076-2615

年卷期： 2022 年 12 卷 7 期

页码：

收录情况： SCI

摘要： Simple Summary A shorter grazing time and supplementation have been demonstrated to increase the grazing efficiency and growth performance of lambs. However, the effects of a shorter grazing time on the gastrointestinal development and carcass quality of growing lambs are poorly understood. In the present study, lambs were offered 2, 4, 8 or 12 h of grazing and separately fed supplementation when off pasture. The results showed that, in comparison to longer grazing times, shorter grazing times-especially 4 h of grazing per day with supplementation-best improved gastrointestinal tract and carcass quality. Therefore, restricting the grazing of lambs to 4 h per day instead of grazing for more extended periods is a better grazing management approach in Inner Mongolia. The effects of restricted grazing durations on the gastrointestinal development and carcass quality of growing lambs are poorly understood. In this study, 32 lambs were randomly assigned to four groups (n = 8, body weight = 21.86 kg) corresponding to 2, 4, 8 and 12 h of grazing per day. When off-pasture, all lambs were housed and fed concentrate and hay. When the grazing time decreased from 12 h to 2 h, the abomasum weight and large intestine length decreased (p = 0.019; p = 0.069). Compared to lambs grazed for 12 h, animals grazed for 2-4 h had a greater villus height and villus-to-crypt ratio in the duodenum, jejunum and ileum segments (p < 0.05); the 2 h lambs had superior carcass quality and a smaller diameter and area of the gluteus medium muscle fibers (p < 0.05), with no significant change after 4 h of grazing. The results indicated that shorter grazing times and supplementation were beneficial for the gastrointestinal tract development and carcass quality of growing lambs. Therefore, a better grazing management approach in Inner Mongolia could be to restrict the grazing of lambs to 4 h per day instead of grazing for more extended periods.