本文選題：灘羊羔羊 + 能蛋水平��； 參考：《中國(guó)畜牧雜志》2016年23期

【摘要】：基于灘羊生長(zhǎng)發(fā)育規(guī)律,實(shí)施羔羊階段式育肥。將4月齡112只羊隨機(jī)分成4個(gè)處理組,每組4個(gè)重復(fù)(公、母各2個(gè)重復(fù))。根據(jù)羔羊體重目標(biāo),分為3個(gè)育肥階段(22~28、29~35、36~40 kg),每個(gè)階段結(jié)束時(shí)進(jìn)行屠宰試驗(yàn)以測(cè)定育肥性能和肉品質(zhì)。根據(jù)肉羊飼養(yǎng)標(biāo)準(zhǔn)(NY/T816-2004),每個(gè)階段均設(shè)置84%(Ⅰ組)、96%(Ⅱ組)、108%(Ⅲ組)和120%標(biāo)準(zhǔn)(Ⅳ組)能量和蛋白水平,且同一階段等能蛋比相同的日糧。結(jié)果表明:3個(gè)階段中,灘羊的末體重、平均日增重、胴體重、屠宰率、優(yōu)質(zhì)切塊重、GR值和尾重均呈現(xiàn)相同變化規(guī)律,即Ⅰ組Ⅱ組Ⅲ組Ⅳ組;22~28 kg,Ⅳ組的末體重和優(yōu)質(zhì)切塊重顯著高于Ⅱ組(P0.05),Ⅳ組的大理石評(píng)分值和肌肉中脂肪含量均顯著高于Ⅰ組(P0.05),Ⅳ組的嫩度值顯著小于Ⅰ、Ⅱ和Ⅲ組(P0.05);29~35 kg,Ⅳ組的末體重比顯著高于Ⅱ組(P0.05),Ⅳ組大理石評(píng)分值和肌肉中脂肪含量均顯著高于Ⅱ組(P0.05);36~40 kg,Ⅲ組的GR值和尾重均顯著低于Ⅳ組(P0.05),Ⅲ組的大理石評(píng)分值顯著高于Ⅱ組(P0.05),與Ⅳ組間無(wú)顯著差異(P0.05)。由此可見(jiàn),在體重22~28、29~35、36~40kg階段,分別飼喂消化能12.30 MJ/kg和粗蛋白15.37%、消化能10.65 MJ/kg和粗蛋白13.61%、消化能9.53 MJ/kg和粗蛋白11.91%的日糧有助于提高育肥性能和獲得優(yōu)質(zhì)灘羊肉。
[Abstract]:Based on the law of growth and development of Tan sheep, the stage fattening of lambs was carried out. 112 sheep aged 4 months were randomly divided into 4 treatment groups with 4 replicates in each group (male, female, 2 repeats). According to the body weight target, the lamb was divided into three fattening stages, namely, 22, 28, 29, 35, 36, 36, 40 kg / kg, respectively. Slaughter tests were carried out at the end of each stage to determine the fattening performance and meat quality. According to the standard of NYT / 816-2004, 84 (group 鈪，

本文編號(hào)：1839810