饲料淀粉糊化度对肉鸡生长性能及蛋白质体外消化率的影响

发布时间：2019-02-24 14:31

【摘要】：试验旨在研究饲料淀粉糊化度对肉鸡生长、屠宰性能及蛋白质体外消化率的影响。试验通过利用等量膨化玉米替代普通玉米达到制备不同淀粉糊化度饲料的目的,膨化玉米替代比例分别为0%(对照组)、10%、20%、30%。试验采用低温制粒方法,分别制备前期(1~3周)破碎料(淀粉糊化度分别为19%、33%、39%、48%)和后期(4~6周)颗粒饲料(淀粉糊化度分别为21%、34%、42%、51%)。试验选取864只肉仔鸡随机分成4组,分别饲喂4种淀粉糊化度的饲料(按淀粉糊化度由低到高分别为Ⅰ、Ⅱ、Ⅲ、Ⅳ组),试验周期为42 d。试验结果表明,饲料淀粉糊化度的提高对肉鸡蛋白质体外消化率无显著影响(P0.05)。在生长性能方面,1~3周Ⅱ、Ⅲ、Ⅳ组的平均日采食量均显著高于对照组(P0.05),但对照组料重比显著低于Ⅱ、Ⅲ组(P0.05)。在4~6周生长性能方面,除Ⅳ组的平均日采食量显著高于Ⅱ组外(P0.05),在其他各项指标上各个处理组之间均没有显著差异(P0.05)。屠宰性能方面,对照组胸肌率显著低于其它3组(P0.05)。在全净膛率、腿肌率、翅重率、肌胃率等方面4个处理组之间差异均不显著(P0.05)。综合上述结果,本试验认为饲料淀粉糊化度由19%提高到51%可增加肉鸡1~3周平均日采食量,并且会使胸肌率提高0.59个百分点~1.33个百分点,但对其蛋白质体外消化率以及总体生长、屠宰性能无显著影响。
[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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