Key Laboratory of Feed Biotechnology of the Ministry of Agriculture and Rural Affairs, Institute of Feed Research, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
Mao-sheng Protein Grass Science and Technology Industry Development Co., LTD, Beijing 101399, China.
Meat Sci. 2024 Dec;218:109644. doi: 10.1016/j.meatsci.2024.109644. Epub 2024 Sep 2.
Protein grass hay (PGH) was used as a new feed source for lambs to study its effect on fattening performance and meat quality. Fifty-six male lambs were allotted to four experimental groups and fed for eight weeks either alfalfa hay (AH)-based diet (control) or diets in which AH was replaced with 33 %, 66 %, or 99 % PGH. The inclusion of PGH did not affect final body weight, dry matter intake, average daily gain, feed conversion ratio, or carcass weight. Moreover, substituting AH with PGH at any level did not influence the ruminal fermentation or serum biochemical parameters, meat color, water holding capacity, shear force, or amino acid profile. However, relative liver weight was increased with 66 % substitutions. Furthermore, replacing 99 % AH with PGH decreased the meat's pH at 24 h. Higher levels of C18:3n-3, C20:5n-3, and total n-3 PUFA and a lower ratio of n-6: n-3 PUFA were also observed in meat from lambs fed PGH at 99 %. These findings suggest that PGH could be incorporated into the lamb's diet up to 99 % without compromising fattening performance and body health while improving their meat n-3 PUFA deposition.
蛋白质草干草（PGH）被用作羔羊的新型饲料来源，以研究其对育肥性能和肉质的影响。将 56 只雄性羔羊分配到四个实验组中，分别用苜蓿干草（AH）为基础的日粮（对照组）或用 PGH 替代 33%、66%或 99%AH 的日粮喂养 8 周。PGH 的添加并不影响最终体重、干物质摄入量、平均日增重、饲料转化率或胴体重。此外，用 PGH 替代任何水平的 AH 均不影响瘤胃发酵或血清生化参数、肉色、水分保持能力、剪切力或氨基酸谱。然而，66%替代组的相对肝重增加。此外，用 99%PGH 替代 99%AH 会降低肉在 24 小时时的 pH 值。用 PGH 喂养的羔羊的肉中还观察到 C18:3n-3、C20:5n-3 和总 n-3 PUFA 的水平更高，n-6:n-3 PUFA 的比例更低。这些发现表明，PGH 可以在不影响育肥性能和身体健康的情况下，将羔羊的日粮中 PGH 的比例提高到 99%，同时提高其肉中 n-3 PUFA 的沉积量。
