發(fā)布時(shí)間：2019-02-24 14:31

【摘要】：試驗(yàn)旨在研究飼料淀粉糊化度對(duì)肉雞生長、屠宰性能及蛋白質(zhì)體外消化率的影響。試驗(yàn)通過利用等量膨化玉米替代普通玉米達(dá)到制備不同淀粉糊化度飼料的目的,膨化玉米替代比例分別為0%(對(duì)照組)、10%、20%、30%。試驗(yàn)采用低溫制粒方法,分別制備前期(1~3周)破碎料(淀粉糊化度分別為19%、33%、39%、48%)和后期(4~6周)顆粒飼料(淀粉糊化度分別為21%、34%、42%、51%)。試驗(yàn)選取864只肉仔雞隨機(jī)分成4組,分別飼喂4種淀粉糊化度的飼料(按淀粉糊化度由低到高分別為Ⅰ、Ⅱ、Ⅲ、Ⅳ組),試驗(yàn)周期為42 d。試驗(yàn)結(jié)果表明,飼料淀粉糊化度的提高對(duì)肉雞蛋白質(zhì)體外消化率無顯著影響(P0.05)。在生長性能方面,1~3周Ⅱ、Ⅲ、Ⅳ組的平均日采食量均顯著高于對(duì)照組(P0.05),但對(duì)照組料重比顯著低于Ⅱ、Ⅲ組(P0.05)。在4~6周生長性能方面,除Ⅳ組的平均日采食量顯著高于Ⅱ組外(P0.05),在其他各項(xiàng)指標(biāo)上各個(gè)處理組之間均沒有顯著差異(P0.05)。屠宰性能方面,對(duì)照組胸肌率顯著低于其它3組(P0.05)。在全凈膛率、腿肌率、翅重率、肌胃率等方面4個(gè)處理組之間差異均不顯著(P0.05)。綜合上述結(jié)果,本試驗(yàn)認(rèn)為飼料淀粉糊化度由19%提高到51%可增加肉雞1~3周平均日采食量,并且會(huì)使胸肌率提高0.59個(gè)百分點(diǎn)~1.33個(gè)百分點(diǎn),但對(duì)其蛋白質(zhì)體外消化率以及總體生長、屠宰性能無顯著影響。
[Abstract]:The purpose of this study was to study the effects of starch gelatinization on broiler growth, slaughter performance and protein digestibility in vitro. The purpose of preparing different starch gelatinization degree feed was achieved by using the same amount of extruded corn instead of ordinary corn. The proportion of extruded corn substitute was 0% (control group), 10% 20% and 30% respectively. The method of low temperature granulation was used to prepare the granule feed (starch gelatinization degree of 19 ~ 3339 ~ (48%) and granulated feed (starch gelatinization degree of 21 ~ (34) ~ (34) ~ 422%) in the early stage (1 ~ 3 weeks) and the later period (4 ~ 6 weeks), respectively. 51%) 864 broilers were randomly divided into 4 groups and fed with four kinds of starch gelatinization diets (鈪，

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