糖萜素对绿壳蛋鸡生产性能的影响

通过饲养实验,探讨了糖萜素对绿壳蛋鸡采食量、产蛋率、蛋重、发病率和经济效益的影响.对绿壳蛋鸡饲喂含糖萜素600mg/kg的日粮,结果表明,绿壳蛋鸡采食量下降了2.41%(P＞0.05),产蛋率提高了7.9%(P＜0.01),蛋重提高了2.1%(P＜0.01),料蛋比降低了11.4%,综合经济效益提高了12.0%,鸡群的健康状况显著改善,发病率由3.0%降低到0.     

添加稀土对蛋鸡生产性能影响的研究

蛋鸡饲粮中添加300mg/kg、400mg/kg的有机稀土络合物，观察其对蛋鸡产蛋率、平均蛋重、采食量等的影响。结果表明：添加稀土能显著提高产蛋率，两试验组分别比对照组高出3.54和6.18个百分点；而对蛋重、采食量影响不大。     

日粮能量水平对产蛋高峰期蛋鸡生产性能的影响

为研究产蛋高峰期蛋鸡代谢能需要量,试验选择220只24周龄尼克粉鸡随机分为5组,分别饲喂代谢能水平为10.07,10.63,10.91,11.41,11.78 MJ/kg的日粮。结果表明:在试验前期(25～38周)、后期(39～51周)和全期(25～51周)随着日粮代谢能水平的升高,各组蛋重、产蛋率、产蛋量、能量采食量差异不显著(P>0.05);采食量、料蛋比逐渐降低;随着日粮代谢能水平的升高蛋鸡增重有增加的趋势,但组间差异不显著(P>0.05)。说明在10.07～11.78 MJ/kg能量浓度范围内,提高日粮能量水平可以降低蛋鸡采食量和料蛋比,但对能量采食量影响不大。     

糖萜素对绿壳蛋鸡生产性能的影响

通过饲料试验，探讨了糖萜素对绿壳蛋鸡采食量、产蛋率、蛋重、发病率和经济效益的影响。对绿壳蛋鸡饲喂含糖萜素600mg/kg的日粮，测定其结果表明，绿壳蛋鸡采集量下降了2．41％（P＞0．05），产蛋率提高了7．9％（P＜0．01），蛋重提高了2．1％（P＜0．01），料蛋比降低了14．0％，综合经济效益提高了12．0％，鸡群的健康状况得到显著的改善，发病率由3．0％降低到0。     

复合氨基酸饲喂蛋鸡试验

利用复合氨基酸饲喂蛋鸡，是当前广开蛋白同料资源，降低生产成本，提高养鸡经济效益的有效途径，我们于1995年5月27日至8月28日在潮泉镇百福图综合养殖场进行了试验并取得了较好的效果。1材料与方法1．1试验鸡分组：选百福图综合养殖场自孵．196日龄罗曼商品代蛋鸡36O只，分为五组每组设两个重复，第1、2、3、4组为试验组，复合氨基酸添加量分别为O．7％、1．7％、2．7％、和3．7％一第5组为对照组。1．2试验用复合氨基酸是畜禽的毛蹄等角质蛋白水解而成，由肥城市龙山化工厂生产，含蛋白47．8％，含18种畜禽所需氨基酸464％。1．3口粮配…     

红辣椒粉对蛋鸡生产性能及蛋品质的影响

试验分组：选取日龄为410d的依莎蛋鸡256羽，在各组间产蛋率、平均蛋重等各项指标基本一致的基础上，随机分成2组：对照组饲喂基础饲料；试验组在对照组日粮的基础上添加1％红辣椒粉；每组128羽。     

氨基酸过量对蛋鸡生产性能的影响

早在六十年代,已开始了氨基酸过量对雏鸡生产性能影响的研究。这些研究主要集中于添加精氨酸缓和某些氨基酸不平衡的问题。现在,则越来越集中于研究氨基酸的用量。例如:Edmonds 和 BaRer(1987)在以玉米和大豆粉组成对照日粮,在其基础上,分别添加4%DL—蛋氨酸,L—苯丙氨酸,L—色氨酸,L—赖氨酸,L—组氨酸,L—     

加强产蛋期管理 提高蛋鸡生产性能

近些年研究产蛋鸡生产性能的人日益增多,虽然在提高产蛋鸡生产性能方面有了一定的效果,但产蛋鸡生产性能低仍制约着蛋鸡业乃至整个畜牧业的持续、快速、健康发展。为此本文对如何提高蛋鸡在产蛋期的生产性能作了阐述。     

非淀粉多糖复合酶对蛋鸡生产性能的影响

为研究非淀粉多糖复合酶在蛋鸡玉米-豆粕-杂粕型低能量水平饲粮中的应用效果．本试验选取35周龄健康褐壳蛋鸡500只,随机分成5组,每组5个重复．每个重复20只鸡．分别饲喂正对照基础（I）日粮、负对照基础（Ⅱ）日粮（在正对的基础上减少50MJ／kg能量）、负对照基础日粮＋300g／t酶制剂（Ⅲ）、负对照基础日粮＋500鼽酶制剂（Ⅳ）、负对照基础日粮＋700g／t酶制剂（V）,研究饲料在常规能量降低50MJ／kg的条件下．酶制剂对蛋鸡生产性能的影响。结果表明：加酶组与正对照组相比差异均不显著（P〉O．05）,添加700g／t酶组产蛋率提高了0．40％,并且总蛋重提高了0．09％．这说明在玉米-豆粕-杂粕型饲料中添加一定量的非淀粉多糖复合酶可以替代饲料中部分植物油,不但未影响生产性能,而且略有提高;加酶组与负对照组相比差异也均不显著（P〉O．05）．但是料蛋比依次降低0．51％、1．53％、1．86％,蛋重也依次增加1．82％、1．82％、1．29％．所以在蛋鸡日粮中添加非淀粉多糖复合酶．能够提高蛋鸡生产性能及饲料转化效率。     

Effect of excess dietary threonine on laying performance,egg quality,serum free amino acids,and digestive enzymes activities of laying hens during the postpeak period

A total of 640 layer hens, 56 wk of age, were allocated to 4 dietary treatments groups, each of which included 5 replicates of 32 hens. Graded levels ofl-Thr were added to the basal diet at 0.0 (control), 1.0, 2.0, and 3.0 g/kg; determined Thr values were 5.7, 6.5, 7.4, and 8.7 g/kg of diet, respectively. In the 53-d feeding trial, egg production increased significantly due to dietaryl-Thr supplementation. Hens fed 2.0 g of Thr/kg of diet had significantly higher egg production than the control diet. Supplementing the diet withl-Thr did not affect egg weight or feed intake, but egg mass increased significantly. Also, FCR was improved significantly and the best FCR was exhibited by hens receiving 2.0 g of Thr/kg of diet. Feeding laying hens a diet containing 2.0 g ofl-Thr/kg of diet improved Haugh units linearly; however, egg shell thickness decreased linearly as the level of dietary Thr increased, and the lowest value was observed for hens fed 3.0 g of Thr/kg of diet. Serum free Thr increased linearly as supplemental Thr increased, but serum free Ile, Phe, and Tyr decreased. No differences attributable tol-Thr were found among groups in the activity of digestive enzymes (trypsin and amylase) in the mucosal homogenates of the jejunum. The activity of α-alkaline phosphatase in the jejunum was analyzed as a marker of mucosal enterocyte maturation and no differences due tol-Thr supplementation were noted. In conclusion, feeding laying hens from 56 to 64 wk of agel-Thr up to 2.0 g/kg can improve laying performance and Haugh units.     

当归补血散对高龄蛋鸡生产性能及蛋品质的影响

120只390日龄海兰褐蛋鸡,随机分为4组。以日粮中分别添加0.5%、1%、1.5%剂量的当归补血散饲喂Ⅰ、Ⅱ、Ⅲ组鸡群,Ⅳ组为对照组。连续给药15 d。分别观察各组每天的产蛋率、日产蛋量等生产性能指标;于第8、15、22、30天各组随机收集10枚蛋测蛋品质指标。结果:试验组Ⅱ、Ⅲ的产蛋率比对照组提高了8.80%(P<0.01)、4.99%(P<0.05);日产蛋量均与对照组差异极显著(P<0.01),分别提高了12.12%、6.82%;料蛋比与对照组相比降低了12.46%(P<0.01)、11.42%(P<0.05)。Ⅱ组的蛋形指数与对照组有显著提高(P<0.05);Ⅰ和Ⅱ组的蛋壳厚度与对照组有显著提高(P<0.05)。其余指标与对照组差异不大(P>0.05)。结论:1%剂量可以明显提高高龄蛋鸡的生产性能和蛋品质。     

能量水平对粉壳蛋鸡生产性能及蛋品质量的影响

为研究不同能量水平对产蛋性能和蛋品质量的影响,试验选用504只194日龄罗曼粉蛋鸡,试验共设3个处理,每个处理5个重复,每个重复33～35只,分别饲喂三个能量水平(10.88、11.09、11.30 MJ/kg)的日粮。试验共进行30 d。试验结果表明,各处理组在采食量、产蛋率、平均蛋重、料蛋比、蛋壳强度和哈夫单位等方面差异不显著;表明能量水平在50～100 kcal/kg范围内波动,对蛋鸡生产性能和蛋品质量未产生显著影响。     

微生态制剂和异麦芽低聚糖对产蛋鸡产蛋性能和免疫力的影响

324只36周龄蛋鸡按3×3二因子完全随机设计分成9组,每组6个重复。微生态制剂添加水平为0%、1%和2%,异麦芽低聚糖的添加水平为0%、0.1%和0.2%。结果表明,添加1%或2%微生态制剂组蛋鸡平均日产蛋量均显著高于未添加组(P<0.10)。添加0.2%异麦芽低聚糖组蛋鸡日产蛋量显著高于未添加异麦芽低聚糖组和添加0.1%异麦芽低聚糖组(P<0.10)。添加0.1%或0.2%异麦芽低聚糖组料蛋比均低于未添加异麦芽低聚糖组(P<0.10)。添加2%微生态制剂组血清总SOD显著高于未添加微生态制剂组或添加1%微生态制剂组(P<0.10)。添加0.1%或0.2%异麦芽低聚糖组血清总SOD显著高于未添加组(P<0.10)。随微生态制剂和异麦芽低聚糖添加水平的提高,血清中IgA、IgM、IgG、C_3、C_4含量均有提高的趋势。     

Effects of an aqueous alfalfa extract on production performance, egg quality and lipid metabolism of laying hens

The present study was conducted to evaluate the effect of an aqueous alfalfa extract (AAE) on production performance, egg quality and lipid metabolism of laying hens between 28 and 36 weeks of age. Four groups of commercial hens (Hy-Line Brown) were fed with diets containing 0, 0.05%, 0.1% and 0.15% AAE. Dietary AAE had no effect on egg production parameters (p > 0.05). Shell strength was increased (linear and quadratic effects; p < 0.05) with gradient addition of AAE. Furthermore, shell strength was notably higher (p < 0.05) in 0.1% and 0.15% AAE groups than the control group. With an exception of serum low and high density lipoprotein cholesterol, serum total triglycerides and liver cholesterol concentration (day 42), lipid indices in yolk, serum and liver were lowered (linear and quadratic effects; p < 0.05) at day 42 and day 56 as AAE in diets increased, as well as the enzyme activities of acetyl-CoA carboxylase (ACC) and β-hydroxy-β-methylglutaryl-CoA (HMG-CoA) reductase. In relation to the control group, cholesterol and triglycerides in yolk, liver and serum and serum very low density lipoprotein cholesterol were lower in 0.15% AAE-treated birds at day 42 and day 56. It also significantly decreased activities of ACC, HMG-CoA reductase and fatty acid synthetase (FAS) at day 56. The 0.1% AAE decreased triglycerides in yolk, liver and serum, as well as the activities of ACC and FAS at day 56. These data suggest that dietary AAE could be applied to improve egg shell quality and modify the lipid status of laying hens and eggs.     

维生素E对蛋鸡产蛋后期产蛋性能和蛋品质的影响

文章旨在研究日粮中不同梯度维生素E添加水平对蛋鸡产蛋后期产蛋性能和蛋品质的影响.试验选择60周龄罗曼白壳商品蛋鸡300羽,试验随机分为5组,添加水平分别为0(对照组),30、60、120、240 mg/kg,每组6个重复,每个重复10羽鸡,预试期1周,正试期8周.结果表明:与对照组相比,蛋鸡产蛋后期日粮中添加120 m...     

添加不同水平复合中草药对蛋鸡血清、组织以及鸡蛋抗氧化指标的影响

为研究不同水平复合中草药对蛋鸡血清、组织和鸡蛋抗氧化指标的影响,试验选用120日龄健康、体重相近的海兰褐蛋鸡300只,随机分为5组,每组6个重复,每个重复10只鸡。对照组饲喂基础日粮,试验组分别在基础日粮中添加0.4%、0.3%、0.2%、0.1%的复合中草药。试验期40d。结果表明:(1)与对照组相比,添加复合中草药制剂能够显著提高蛋鸡平均蛋重和产蛋率(P<0.05),添加0.1%、0.3%和0.4%复合中草药组平均蛋重分别提高6.4%、4.4%和6.0%(P<0.05);添加0.3%复合中草药组产蛋率显著提高22.2%(P<0.05);(2)添加0.3%和0.4%复合中草药组超氧化物歧化酶(SOD)活性分别提高5.5%和5.9%(P<0.05);(3)添加0.4%复合中草药组肝脏SOD含量和总抗氧化能力分别提高56.0%和37.0%(P<0.05);(4)添加0.2%、0.3%和0.4%复合中草药组鸡蛋SOD酶活性分别提高8.3%、18.0%和25.2%(P<0.05)。综上所述,在本试验条件下,饲粮中添加复合中草药能够改善蛋鸡生产性能和蛋鸡血清、组织和鸡蛋抗氧化能力,以添加0.4%的复合中草药制剂效果较好。