【作者】 张立元；

【导师】 陈国宏； 张学余；

【作者基本信息】 扬州大学 ， 养殖， 2006， 硕士

【摘要】 以4周龄邵伯鸡为研究素材，随机将其分为4组(分别记为试验1、2、3、4组)，每组80只(公、母各半)，4～7周龄时试验1～4组日粮蛋白质水平分别为20％、18.5％、17％和15.5％，8～10周龄试验1～4组日粮蛋白质水平分别为18％、17％、16％和14.5％，探讨不同日粮蛋白质水平对邵伯鸡生长性能、屠宰性能和胸肌肌苷酸及脂肪含量的影响。结果表明：1、10周龄时试验1、2、3组间体重差异不显著(P＞0.05)；试验3组与试验4组间体重差异不显著(P＞0.05)，试验1组和试验2组体重极显著高于试验4组(P＜0.01)。2、利用Logistic曲线拟合邵伯鸡生长规律，其拟合度(R~2)为0.9974，说明用Logistic曲线方程能很好地拟合邵伯鸡的生长过程。3、10周龄时试验1～3组与试验4组屠体重差异极显著(P＜0.01)，试验1组与试验2组、试验1组与试验3组间屠体重差异显著(P＜0.05)；试验1组与试验4组半净膛重差异显著(P＜0.05)；试验1组与试验3组、4组全净膛重差异极显著(P＜0.01)，试验2组与试验4组差异显著(P＜0.05)；不同试验组胸肌重差异不显著(P＞0.05)，试验1组与试验2组、3组腿肌重差异显著(P＜0.05)，试验1组与试验4组差异极显著(P＜0.01)；试验2组与试验3组皮下脂肪厚差异显著(P＜0.05)，试验1组与试验3、4组以及试验2组与试验4组差异极显著(P＜0.01)；各组间腹脂重和肌间脂肪带宽度差异不显著(P＞0.05)。4、10周龄活重、屠体重、半净膛重、全净膛重、胸肌重、腿肌重间相关极显著(P＜0.01)，但这些性状与肌肉脂肪含量以及皮下脂肪厚间的相关不显著(P＞0.05)。公鸡和母鸡各屠宰性能间相关存在较大差异，与全群各屠宰性能间相关也存在较大的差别，总体而言其相关程度小于全群。5、10周龄时试验1组与试验3、4组间肌肉脂肪含量差异显著(P＜0.05)，其它各组间差异不显著(P＞0.05)，不同性别间肌肉脂肪含量差异不显著(P＞0.05)，肌肉脂肪含量以试验3组为最高；不同试验组间肌肉肌苷酸含量差异不显著，(P＞0.05)，说明不同蛋白质水平日粮对肌肉内肌苷酸含量无显著影响。更多还原

【Abstract】 Shaobai chickens at the age of 4 weeks were randomly divided into group 1, 2, 3,and 4, and each group was 80 chickens which had 40 male and 40 female chickens. Thechickens of group 1, 2, 3 and 4 were fed the diets which protein levels were 20％,18.5％, 17.0％and 15.5％respectively at 4～7 weeks of age, and the diets which proteinlevels were 18％, 17％,16％and 14％respectively at 8～10 weeks of age. Productionperformance, slaughter traits, inosinic acid content and content of breast muscle fat atdifferent dietary protein levels were measured. The results showed that:1. There were no significant differences of body weights among group 1, 2 and 3chickens at 10 weeks of age (P＞0.05). Body weights of group 4 were no significantdifference than that of group 3 (P＞0.05), and extremely significant higher than that ofgroup 1 and 2 (P＜0.01).2. The growth law of Shaobai chickens was studied using logistic curve, and thecoefficient of determination of the logistic model (R~2) was 0.9974. The result indicatedthe logistic curve could fit Shaobai chickens very well.3. The weights of dressed chickens of group 1, 2 and 3 were extremely significanthigher than that of group 4 at 10 weeks of age(P＜0.01). The weights of dressed chickensof group 1 were significant higher than that of group 2 and3 at 10 weeks of age(P＜0.05).There was significant difference of half-eviscerated weight between group 1 and group 4(P＜0.05). There were significant difference of eviscerated weight between groupl andgroup 3, 4 (P＜0.01). Eviscerated weight of group 2 was significant difference than thatof group 4 (P＜0.05). There were no significant differences of weights of breast muscleamong group 1, 2, 3 and 4 (P＞0.05). Weights of leg muscle of group 1 were significantdifferences than that of group 2, 3 (P＜0.05), and extremely significant difference thanthat of group 4 (P＜0.01). Skin fat thickness of group 2 was significant difference than that of group3 (P＜0.05), and extremely significant difference than that of group 4(P＜0.01). Skin fat thickness of group 1 was extremely significant difference than thatof group 3 and 4 (P＜0.01). There were no significant differences of weights ofabdominal fat and width of breast muscle fat strip among four groups (P＞0.05).4. There were extremely significant correlation among live body weight, weight ofdressed chicken, half-eviscerated weight, eviscerated weight, breast muscle weight andleg muscle weight of Shaobai chicken at 10 weeks of age, and there were no significantcorrelation between those characters and content of breast muscle, skin fat thickness(P＞0.05). The correlations of slaughter traits in male group was different than that offemale group, which were smaller than that of whole group.5. Content of breast muscle fat in group 1 was significant difference than that ingroup 3 and 4 (P＜0.05) at 10 weeks of age. There was no significant difference betweencontent of breast muscle fat in male and that in female (P＞0.05). Content of breastmuscle fat in group 3 was the highest among four groups. There were no significantdifferences of inosinic acid content among four groups(P＞0.05). The result reflected thatdietary protein levels did not effect on inosinic acid content.更多还原