本试验旨在研究过瘤胃保护胆碱（ rumen protected choline，RPC）对肉羊生长、消化、血清指标以及肉品质的影响。选用24只杜湖杂交1代公羔，根据体重相近原则随机分成对照组、试验Ⅰ、Ⅱ和Ⅲ组（基础饲粮中分别添加0、0．25％、0．50％、0．75％ RPC）。预试期15 d，正试期60 d。结果表明：添加RPC对肉羊的干物质采食量无显著影响（ P＞0．05），显著或极显著提高了干物质、有机物和酸性洗涤纤维的表观消化率（ P＜0．05或P＜0．01）。与对照组相比，试验Ⅰ组显著或极显著提高了平均净增重（ANG）和平均日增重（ADG）（P＜0．05或P＜0．01），显著降低了料重比（F／G）和血清尿素氮含量（P＜0．05），但是血清总蛋白（TP）、肌酐（Cr）含量和肌酸激酶（ CK）活性都没呈现显著差异（ P＞0．05）。各试验组间屠宰率差异不显著（ P＞0．05），试验Ⅰ组较对照组减缓了羊肉宰后12 h的pH下降速度，极显著降低了剪切力（ P＜0．01）。本试验中，在0．25％添加水平下，RPC有降低料重比，提高养分消化率，改善氮利用效率和羊肉品质的效果。%The aim of this research was to study the effects of rumen protected choline ( RPC) on growth, di⁃gestion, serum indices and meat quality of lambs. Twenty four Doper×Hu F1 male lambs were randomly divid⁃ed into control group, group Ⅰ, group Ⅱ and group Ⅲ ( RPC level in diets was 0, 0. 25%, 0. 50% and 0.75%, respectively) according to similar body weight. The experiment had a 15⁃day pre⁃experiment and a 60⁃day experiment. The results showed that dry matter intake was not affected by RPC ( P>0.05) , and RPC sig⁃nificantly improved apparent digestibility of dry matter, crude protein, organic matter, neutral detergent fiber and acid detergent fiber ( P<0.05 or P<0.01) . Compare with control group, average net gain and average dai⁃ly gain in group Ⅰ were significantly improved ( P<0.05 or P<0.01) , and feed to gain ratio and serum urea nitrogen content in group Ⅰ were significantly decreased (P<0.05), while there were no significant differ⁃ences in serum total protein, creatinine contents and creatine kinase activity ( P>0.05) . The dressing percent⁃age has no significant difference among groups, but group Ⅰ had significant lower shear force of meat ( P<0.01) , and slowed down meat pH decrease rate at 12 h post⁃slaughter. It is concluded that the supplementation of RPC at 0.25% can decrease feed to gain ratio, improve nutrient digestibility, nitrogen utilization and meat quality.
展开▼
