【摘要】：本試驗(yàn)旨在研究飼糧添加不同水平低聚木糖(XOS)對(duì)仔豬生長(zhǎng)性能、背最長(zhǎng)肌營(yíng)養(yǎng)成分含量及肌纖維類型組成的影響,探討XOS在仔豬飼糧中的最佳添加量及其對(duì)肌肉營(yíng)養(yǎng)成分和肌纖維類型組成的調(diào)控作用。試驗(yàn)選取健康的21日齡"杜×長(zhǎng)×大"斷奶仔豬120頭,隨機(jī)分為4組,每組6個(gè)重復(fù),每個(gè)重復(fù)5頭豬。對(duì)照組飼喂基礎(chǔ)飼糧,試驗(yàn)組(Ⅰ組、Ⅱ組和Ⅲ組)分別飼喂在基礎(chǔ)飼糧中添加100、250和500 mg/kg XOS的飼糧,試驗(yàn)期為56 d。試驗(yàn)結(jié)束后,每重復(fù)選取1頭接近平均體重的仔豬進(jìn)行屠宰取樣。結(jié)果表明:1)與對(duì)照組相比,Ⅰ組仔豬的平均日增重和平均日采食量顯著增加(P0.05),Ⅱ組和Ⅲ組平均日采食量顯著增加(P0.05),但末重和料重比各組之間差異不顯著(P0.05);2)各組之間背最長(zhǎng)肌粗蛋白質(zhì)、粗脂肪以及游離氨基酸包括亮氨酸、甘氨酸及天冬氨酸含量差異不顯著(P0.05),其他氨基酸含量試驗(yàn)組與對(duì)照組相比均有不同程度地升高或降低;3)與對(duì)照組相比,Ⅰ組肌球蛋白重鏈(MyHC)Ⅱa和MyHCⅡx mRNA相對(duì)表達(dá)量顯著增加(P0.05),Ⅱ組MyHCⅠmRNA相對(duì)表達(dá)量與Ⅲ組相比顯著增加(P0.05);與對(duì)照組相比,Ⅰ組腺苷酸活化蛋白激酶α、沉默交配型信息調(diào)節(jié)因子2同源蛋白1和解偶聯(lián)蛋白3 mRNA相對(duì)表達(dá)量顯著增加(P0.05),但過(guò)氧化物酶體增殖物激活受體γ輔激活因子1αmRNA相對(duì)表達(dá)量各組之間差異不顯著(P0.05)。由此可知,仔豬飼糧中合理添加X(jué)OS能提高生長(zhǎng)性能,促進(jìn)慢肌纖維相關(guān)基因的表達(dá),推薦添加水平為100~250 mg/kg。
[Abstract]:The purpose of this experiment was to study the effects of dietary supplementation of different levels of xylooligosaccharide (XOS) on growth performance, nutrient content of the longissimus dorsi muscle and composition of muscle fibers in piglets. Objective: to investigate the optimal addition of XOS and its regulation on muscle nutrient composition and muscle fiber type in piglets. 120 weaned piglets of 21-day-old "du 脳 Chang 脳 Da" were randomly divided into 4 groups with 6 replicas in each group and 5 pigs in each group. The control group was fed with basic diet, and the experimental group (group 鈪，

本文編號(hào)：2440683