Effects of Replacing Alfalfa Hay With Native Grass Hay in Pelleted Total Mixed Ration on Physicochemical Parameters, Fatty Acid Profile, and Rumen Microbiota in Lamb

作者：Shuai Du, Sihan You, Lin Sun, Xiaolong Wang, Yushan Jia, Yulei Zhou · 发表于：Frontiers in Microbiology · 年份：2022 · DOI：10.3389/fmicb.2022.861025 · 被引用次数：18 · 研究领域：Ruminant Nutrition and Digestive Physiology、Genetic and phenotypic traits in livestock、Agriculture Sustainability and Environmental Impact

This study aimed to investigate the effects of replacing alfalfa with native grass on growth performance, meat quality, and rumen microbiota of lambs. Forty-five 6-month-old Ujimqin lambs with live body weight (BW) of 29.50 ± 0.26 kg were used for the experiment, and the lambs were assigned to three diet treatments (three pens per treatment and five lambs per pen) with 30 square meters per pen in semi-open housing based on similar BW. The lambs have received 30% alfalfa (HA, high alfalfa percentage group), 20% alfalfa (MA, moderate alfalfa percentage group), and 10% alfalfa (LA, low alfalfa percentage group) diets, respectively (dry matter basis). The diet treatments had a significant ( P < 0.05) influence on the dry matter intake of lambs and the dry matter intake increased with the increasing percentages of native grass hay, while the significantly ( P < 0.05) lower final BW and average daily gain were observed in the MA and LA groups compared with that in the HA group. The diet had a significant ( P < 0.05) difference in meat pH value, water loss rate, cooked meat rate, moisture, and intramuscular fat, while no significant ( P > 0.05) difference was found in protein. As native grass hay percentages increased in the diet, the contents of palmitic (C16:0) and palmitoleic (C16:1 cis -9) in the HA and MA groups were significantly ( P < 0.05) lower than that in the LA groups, and compared with the HA group, the contents of elaidic (C18:1 trans...