Effect of rumen-protected guanidinoacetic acid provision as a dietary supplement on the growth, slaughter performance, and meat quality in simmental bulls

IF 7.1 1区农林科学 Q1 Agricultural and Biological Sciences

Meat Science Pub Date : 2025-06-15 DOI:10.1016/j.meatsci.2025.109889

Jing Zhang, Changjian Xue, Jiaojiao Lang, Caixia Pei, Qiang Liu

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引用次数: 0

Abstract

We investigated the influences of dietary rumen-protected guanidinoacetic acid (RPGAA) on the growth, slaughter performance, and meat quality characteristics of Simmental bulls. In this study, 56 bulls (615 ± 8.9 kg) were randomly assigned to 74-day treatment in four group: control, low-RPGAA (0.3 g/kg dry matter [DM]-guanidinoacetic acid [GAA]), medium-RPGAA (0.6 g/kg DM-GAA), and high-RPGAA (0.9 g/kg DM-GAA), with 14 bulls per group. With RPGAA supplementation, the average daily gain increased quadratically (P < 0.05), whereas the feed-conversion ratio decreased linearly (P = 0.027). Additionally, blood total protein and albumin levels increased linearly (P < 0.05), while creatine (Cr), creatine kinase, and insulin-like growth factor 1 increased quadratically (P < 0.05). RPGAA supplementation linearly increased (P < 0.05) dressing percentage, lean percentage, and loin eye area, while linearly decreasing (P < 0.05) backfat thickness, fat percentage and subcutaneous fat percentage. The pH at 24-h postmortem and shear force of the Longissimus lumborum muscle were linearly increased (P < 0.05), whereas cooking and drip losses were linearly reduced (P < 0.05). RPGAA supplementation linearly increased (P = 0.017) protein content; quadratically elevated (P = 0.021) ether extract content, the percentage of phosphorylated Cr/Cr, and the adenosine diphosphate/adenosine triphosphate ratio, while linearly decreasing moisture content (P = 0.012). Medium-RPGAA supplementation significantly increased (P < 0.05) protein expression related to muscle proliferation, development, protein synthesis, and intramuscular fat synthesis, while significantly decreasing (P < 0.05) proteins expression correlated with subcutaneous fat deposition. In conclusion, dietary RPGAA supplementation enhanced the growth, slaughter performance, and meat nutritional quality of fattened Simmental bulls by altering protein expression related to muscle proliferation, development, protein synthesis, subcutaneous fat deposition, and intramuscular fat synthesis.

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饲粮添加过瘤胃胍基乙酸对西门特公牛生长、屠宰性能和肉品质的影响

研究了饲粮中添加过瘤胃胍基乙酸（RPGAA）对西门塔尔公牛生长、屠宰性能和肉品质的影响。试验选用56头公牛（615±8.9 kg），随机分为对照组、低rpgaa组（0.3 g/kg干物质[DM]-胍基乙酸[GAA]）、中rpgaa组（0.6 g/kg DM-GAA）和高rpgaa组（0.9 g/kg DM-GAA），每组14头。添加RPGAA后，平均日增重呈二次增长(P <；0.05)，饲料系数呈线性下降（P = 0.027）。此外，血总蛋白和白蛋白水平线性升高(P <；0.05)，而肌酸（Cr）、肌酸激酶和胰岛素样生长因子1呈二次增长(P <；0.05)。RPGAA添加量线性增加(P <；0.05)，屠宰率、瘦肉率和腰眼面积呈线性下降(P <；0.05)背膘厚度、脂肪率和皮下脂肪率。死后24 h pH值和腰最长肌剪切力呈线性增加(P <；0.05)，蒸煮和滴漏损失线性降低(P <；0.05)。添加RPGAA可线性提高蛋白质含量（P = 0.017）；二次升高（P = 0.021）粗提物含量、磷酸化Cr/Cr比例和二磷酸腺苷/三磷酸腺苷比，线性降低（P = 0.012）水分含量。补充中- rpgaa显著增加(P <；与肌肉增殖、发育、蛋白质合成和肌内脂肪合成相关的蛋白表达显著降低(P <；0.05)蛋白表达与皮下脂肪沉积相关。由此可见，饲粮中添加RPGAA通过改变与肌肉增殖、发育、蛋白质合成、皮下脂肪沉积和肌内脂肪合成相关的蛋白质表达，提高了肥育西门塔尔公牛的生长、屠宰性能和肉类营养品质。

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来源期刊

Meat Science 工程技术-食品科技

CiteScore

12.60

自引率

9.90%

发文量

282

审稿时长

60 days

期刊介绍： The aim of Meat Science is to serve as a suitable platform for the dissemination of interdisciplinary and international knowledge on all factors influencing the properties of meat. While the journal primarily focuses on the flesh of mammals, contributions related to poultry will be considered if they enhance the overall understanding of the relationship between muscle nature and meat quality post mortem. Additionally, papers on large birds (e.g., emus, ostriches) as well as wild-captured mammals and crocodiles will be welcomed.