产蛋鸡不同蛋白质营养标准的效果

产蛋鸡不同蛋白质营养标准的效果郑星道,孙凤午,金杰,刘去同,全世元,赵江（吉林农业大学·长春·１３０１１８）（吉林省通化县家畜繁殖改良站）（吉林省洮安市饲料公司）在赖氨酸水平固定不变的情况下（０．６５％－０．５５％）,研究了不同饲养阶段不同蛋白质水平...     

产蛋鸡蛋白质营养参数的探讨

本试验研究的目的是对产蛋鸡饲喂不同蛋白质水平的平衡日粮,通过饲养代谢试验,在正常的笼养生产条件下,观察饲料的消耗和生产性能以及蛋白质利用情况,求测出不同产蛋率的蛋白质营养参数,为今后修订和补充国内产蛋鸡的蛋白质营养标准提供科学依据。     

产蛋鸡分时饲喂不同营养水平饲料的效果

从目前农村专业户饲养蛋鸡每日给料饲喂方法上来看,大都采用全天喂给相同营养水平的全价配合饲料,即通常每公斤配合饲料中,含粗蛋白质16-17％,代谢能11.2兆焦耳、钙3.1-3.3％、磷0.60-0.75％。这种全天统喂同一营养水平的给料法,既不能满足产蛋鸡昼夜的代谢需要和周期节律性的变化,也没有注意到蛋白和蛋壳的形成。这种饲喂方法,即使配合再佳,其产蛋率的提高也受到一定制约。为使相同总量的饲料,达到喂后多产蛋的目的,笔者依据产蛋鸡昼夜不同代谢需要及产蛋周期的节     

不同营养水平的日粮分餐饲喂产蛋鸡的效果

选取52周龄健康无病、体况良好的F_1代罗曼蛋鸡288只.随机分成只数相等的试验组和对照组,两组在同一舍内相同方位的相同的饲养管理条件下。试验组在早晨6:30投给高能(代谢能2993兆卡/千克)、高蛋白(粗蛋白19.5％)、低钙(钙1.67％)的Ⅰ号日粮.下午14:30投给低能(代谢能2474.4兆卡/千克)、低蛋白(粗蛋白:13.93％)、高钙(钙4.97％)的Ⅱ号日粮。Ⅰ号料的饲喂量以能在Ⅱ号料投饲前的1-1.5小时采食完为宜(即中午净槽1-1.5小时),Ⅱ号料的饲喂量以能在第10天早晨略有剩余为宜;对照组则饲以鸡场日常饲用的日粮(其中代谢能2710.6     

产蛋鸡的蛋白质需要

在《鸡的营养》(Nutritioa of the Chicken,1982)一书中,作者 Scott 等指出,影响产蛋鸡饲料消耗和蛋白质需要量的因素很多,其中有:(1)母鸡的品种和体重,(2)环境温度,(3)产蛋阶段,(4)舍饲方式(笼养或平养),(5)每只母鸡的采食间隔,(6)自动饲槽中饲料的深度,(7)母鸡是否适当地切喙,(8)     

产蛋鸡日粮中蛋白质水平不同的结果

作者研究了日粮中赖氨酸不低于0.65-0.55％的情况下,不同产蛋阶段的日粮蛋白质水平对产蛋率、饲料利用率和蛋品质的影响。结果证明,蛋白质水平对鸡的     

产蛋鸡蛋白质需要量研究进展

蛋白质是蛋鸡必需的营养物质之一,饲粮蛋白质水平对蛋鸡的生产性能、蛋品质等都有很大的影响;同时,因近些年的蛋鸡饲料业竞争激烈,饲料厂家都想降低饲料成本获得最大经济效益,所以在保证饲料蛋白质水平和质量的同时,如何降低饲料中蛋白质的成本就显得极其重要。本文在分析国内外相关文献报道的蛋白质水平对不同品种、不同时期蛋鸡的生产性能、蛋品质以及部分血液生化指标影响的基础上,探讨蛋鸡蛋白质需要的适宜水平。     

产蛋鸡饲料蛋白质的利用

目前,养鸡饲料中的谷物类和蛋白质的供应,逐渐出现紧张的趋势,尤其是鸡饲料中所含大豆粕、鱼粉等蛋白质饲料资源不足。解决这些问题,不仅开发代用饲料蛋白质资源是重要的,同时,有效利用现有蛋白质资源也是很重要的课题。从这个观点出发,作者对蛋鸡饲料蛋白质的利用进行了以下研究。产蛋鸡需要多少蛋白质尽管鸡的品种改良有了很大进展,产蛋能力也不断提高,但是,十几年前大家一直认为的为了达到圆满的产蛋成绩,每只鸡每日要要18～19克蛋白质,而目前则认为大约     

夏季产蛋鸡的营养

饲料采食量随温度升高而下降,这是早已熟知的问题。没有任何其它因素比环境温度的变化对能量的摄取量影响更大,许多人在限定的温度范围内做了定量的研究:在-5～30℃(温度适中区)之间,温度每升高1℃估计饲料采食量约下降1.6％,能量摄入量可变化40％。     

The correct nutrition of laying hens

合理的营养在现代产蛋母鸡发挥产蛋遗传潜力和蛋品质量上起着一定的作用.此外,每枚鸡蛋的饲料成本占其生产成本的65％～70％.因此,产蛋母鸡的营养方案在决定鸡蛋生产企业的总体利润和成功上非常关键.     

产蛋母鸡合理的营养方案

产蛋母鸡的合理营养对确保蛋鸡和鸡蛋生产企业获得最佳生产成绩非常重要。     

The effect of 2,4-dichlorophenoxyacetic acid on laying hens

Laying hens were fed 2,4‐D, a herbicide, at a rate equivalent to 50 and 150 mg/kg diet from age 28 to 48 weeks. No adverse effects of the treatments were observed upon rate of egg production, egg or yolk weight, egg shell thickness, hatchability or growth rate of the progeny.     

The effect on profit of Optimising nutrient density for laying hens

1. Using economic data from three locations in Australia nutrient densities were compared in laying diets which either minimised the daily cost of feeding a hen or maximised profit.

2. The effects of nutrient density on rate of production and egg weight were examined using published data to show that, within the range chosen for the analysis, nutrient density did not significantly (P < 0#lb05) affect rate of lay but was significantly and positively correlated (P< 0#lb01) with egg weight.

3. Nutrient densities which maximised profit were higher than those which minimised daily food cost.

4. Averaged over the three locations, maximum profit was achieved at a nutrient density of 11#lb80 MJ/kg compared with 11*57 MJ/kg to minimise food cost.

5. Food cost at the most profitable nutrient density was $2#lb00 per tonne higher than at the nutrient density which minimised food cost but resulting profit was slightly higher.     

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。     

复合酶制剂对产蛋鸡生产性能的影响

当前,酶制剂作为饲料添加剂已引起世界畜牧业的普遍重视和广泛应用,其应用范围从最初的鸡、猪等单胃动物推广到反刍动物和水产养殖生产中。目前美国、芬兰、瑞典等欧美国家90%以上的饲料中都添加了酶制剂。当前的酶制剂种类已从单一的酶制剂向复合酶制剂发展,酶制剂已成为当今乃至将来畜牧业生产中不可缺少的一类重要饲料添加剂。复合酶制剂是由多种消化酶组合而成,对提高饲料消化率和降低饲料成本有独特功效。为验证复合酶制剂在蛋鸡饲料中添加的饲养效果,特设计本试验,以供参考。     

The effect of feeding hemp seed meal to laying hens

Seed of the hemp cultivar Unika-b was cold-pressed to obtain hemp seed meal (HSM) containing 307 g/kg crude protein and 164 g/kg ether extract (60 g/kg linoleic acid, 120 g/kg alpha-linolenic acid, 160 g/kg oleic acid, lesser amounts of palmitic, stearic, and gamma-linolenic acids). For 4 weeks, 102 43-week-old DeKalb Sigma hens were fed on isonitrogenous and isoenergetic diets containing 0, 50, 100 or 200 g/kg HSM. Eggs were collected for fatty acid analysis during the fourth week of feeding these diets. No significant differences were found between feed treatments for egg production, feed consumption, feed efficiency, body weight change or egg quality. Increasing dietary inclusion of HSM produced eggs with lower concentrations of palmitic acid and higher concentrations of linoleic and alpha-linolenic acids.     

The effect of rapeseed meal on the energy metabolism of laying hens

1. The effect of 100 g rapeseed meal (RSM)/kg diet on the energy metabolism of hybrid laying hens was examined by indirect calorimetry. Thyroid hormone concentrations, thyroid weight, liver weight and body weight, egg production and food intake were also measured. 2. Fasting heat production was significantly lower in hens receiving RSM than in controls, but this difference disappeared when the birds were fed. 3. Thyroid hormone concentrations decreased, while thyroid and liver weights increased slightly; none of these effects was significant. Body weight, egg production and food intake were unaffected and no liver haemorrhages were noted. 4. The maintenance metabolisable energy (ME) requirement of control and treated birds, estimated from short-term energy balance measurements, was 474 kJ/kg0.75 d; net availability of ME in both treatments was 0.85.