营养酸模饲喂肉兔增重效果的研究

用营养酸模、紫花苜蓿以及农户家常喂兔饲料杨树叶、榆树叶对日本大耳兔进行增重效果的对比试验。结果表明：试验Ⅰ组（营养酸模）、试验Ⅱ组（紫花苜蓿）增重均显著高于试验Ⅲ组（毛白杨＋胡杨）、试验Ⅳ组（榆树叶）（Ｐ＜０．０１、Ｐ＜０．０５），增重效果提高 １８．６％～３７．５％；可显著提高饲料报酬。降低饲养成本；并能有效地改善兔肉品质，使其蕴含奇香。试验证实，营养酸模可以替代紫花苜蓿用于肉兔育肥，并显示出较高的经济效益ｃ     

鲁梅克斯酸模牧草饲喂乳用牛试验报告

1　试验目的试验目的在于用鲁梅克斯Ｋ -1杂交酸模鲜草代替象草 ,观察其对母牛泌乳量的影响 ,评价鲁梅克斯Ｋ -1杂交酸模对泌乳牛的生产效果 ,为大面积推广该牧草提供科学依据。2　试验材料与方法2 .1　饲料来源鲁梅克斯Ｋ -1杂交酸模鲜草由柳州市畜牧站提供。2 .2　供试母牛基本情况供试泌乳母牛选择了羊角山奶牛场 40头荷斯坦母牛 ,按年龄、胎次、泌乳期泌乳量基本相同的原则随机分为试验组与对照组 ,每组各2 0头。2 .3　试验设计本试验为期 3 8天 (预试期 5天、试验期 3 3天 )。试验开始前和试验期 ,供试牛放于同一栏舍内由专人饲养。每…     

稀土添加剂在奶牛业中的应用效果试验报告

通过甘肃黑白花奶牛日粮中添加稀土硝酸盐的饲喂试验,测定试验期内的乳脂率、个体平均挤奶量和总挤奶量等项,并进行比较分析。结果表明,稀土对提高奶牛的生产性能和饲料效率,降低饲养成本有一定作用。     

过瘤胃蛋白粉饲喂奶牛试验报告

过瘤胃蛋白粉是根据反刍动物的消化生理特点，以优质植物蛋白源、多种有益细菌发酵的菌体蛋白及酵母等为源料，引进美国．的过瘤胃蛋白质加工技术及有效补充瘤胃微生物活动所需能量技术的高科技产品。其粗蛋白含量大于50％，过瘤胃蛋白大于35％，但是在生产实践中效果怎样，尚无确切定论。为了摸清过瘤胃蛋白粉饲喂奶牛的效果，     

苹果渣饲喂泌乳牛的试验效果

苹果渣是生产苹果汁的下脚料,营养丰富,适口性好,近几年,随着苹果加工厂的增加,我市许多养奶牛户利用苹果渣下脚料饲喂奶牛,不仅解决了苹果渣造成的环境污染问题,而且提高了奶牛产量,降低了生产成本,增加了奶牛养殖业效益。为进一步验证和推广该技术,笔者于1999年在我场进行了利用苹果渣饲喂泌乳牛的对比试验,取得了理想效果。     

泌乳牛饲喂蛋白浓缩料钻石系列-5540的效果

选择体重、胎次、分娩天数、产奶量基本一致的处于泌乳中期的健康荷斯坦牛52头随机分为试验和对照两组。经过42天的饲喂试验，结果表明：与对照组相比，试验组的奶牛日产奶量提高0．66千克，乳脂率提高0．21个百分点，乳蛋白率提高0．03个百分点，经济效益增加1、65元／头日。     

泌乳牛饲喂“保增乐”产奶效果明显

泌乳牛饲喂“保增乐”产奶效果明显○合肥市奶牛场（２３００３１）张正林徐水平韩先满罗继保“保增乐”是美国Ｐｅｔ－Ａｇ公司开发的高科技产品，是一种调控瘤胃微生物的添加剂。据有关资料介绍，它是以曲霉属真菌（ＡＳＰＥＲＧＩＬＬＵＳ）发酵提取物为主要成分的添加...     

营养酸模、普那菊苣育肥肉牛试验

用营养酸模、普那菊苣对舍饲条件下的秦杂母牛进行了育肥试验。试验结果表明 :试验 、 组及对照组 ( CK)的平均日增重分别为 0 .76kg、0 .72 kg、0 .5 7kg,两试验组比对照组提高增重 33.33%及 2 6.32 % ,差异极显著 ( P<0 .0 1 ) ;每千克增重可分别降低饲料成本 0 .94元和 0 .68元。表明用这两种优质牧草进行肉牛育肥 ,切实可行、效益显著     

鲁梅克斯K-1杂交酸模饲喂西门塔尔杂交牛的效果研究

本试验分别用西杂F2代母牛90头和西杂F3代公牛30头做产奶和育肥试验，每组又分试验组和对照组，各组的试验组与对照组精料用量及营养水平相同。试验组饲喂鲁梅克斯K－1杂交酸模牧草，对照组饲喂青刈杂草，产奶组在一个泌乳期（270d）内，试验组比对照组多产奶818kg/头（P＜0.05），增收1852.2元／头，育肥组育肥90d内，试验组平均增重比对照组提高33％（P＜0.05），增收190.4元／头。     

小苏打对奶牛泌乳性能的影响试验

试验选择处于产奶高峰期的奶牛20头,随机分成两组,每组10头。试验用奶牛补充精料配方参照NRC、SB/T10261-96标准设计,试验组奶牛补充精料中添加0.8%缓冲剂小苏打。试验结果表明,试验组奶牛乳脂率和产奶量分别提高1.98%和11.21%(p<0.05),单位产奶成本降低5.88%。     

微量元素添加剂对奶牛泌乳性能影响

针对奶牛日粮营养不平衡,导致产奶量低、乳脂率低,经济效益低的生产状况,本试验随机选择4胎、5胎、6胎泌乳期牛10头,分试验组与对照组,各试验牛按日产奶量饲喂不等量精料补充料、玉米秸与稻秸按2:1混合的粗饲料、尿素基础饲粮。试验组饲粮按产奶量分等添加微量元素添加剂,试验期试验组奶料比为3.25,对照组为2.9,试验组增加0.34kg(P<0.05)。试验期产奶量按4.0%标准乳计算,试验组日产奶量高于对照组4.31kg(P<0.05)。按每kg增重折合鲜奶8.0kg校正体重后标准乳计算,试验组日产奶量高于对组4.36kg(P<0.01)。乳脂、乳钙、乳蛋白质(2.29 乳脂率×0.33计算),试验组比对照组分别提高0.32%、0.10%、0.03%(P<0.05)。添加微量元素的试验组,头均日产标准奶24.12kg,对照组19.8kg(P<0.05),按kg鲜奶1.80元计算,头、日产奶分别收入43.42元、35.62元(P<0.05)。头均日耗饲料的实际价格试验组9.15元、对照组7.82元(P<0.01),试验组比对组多增收6.46元(P<0.05),经济效益显著。     

奶牛日粮配合饲喂试验

本文研究了在奶牛日粮中添加冬牧-70黑麦草和奶牛专用预混料作为奶牛配合精料能提高奶牛产奶量9％。经过方差分析，对产奶量的影响差异极显著。     

南阳牛日粮中添加多酶剂饲喂效果试验报告(2)

南阳牛日粮中添加10克多酶剂，经过3个阶段90d的饲喂试验，试验组比对照组每头每日增重提高0．26kg。可消化能，可消化粗蛋白利用率分别提高33．32％，33．33％。     

Dependence of the lactation duration and efficiency on the season of lambing in relation to the prolactin and melatonin secretion in ewes

Changes in day length and the related secretion of melatonin and prolactin are of particular significance in sheep, as they determine reproductive processes, the last stage of which is lactation. The aim of the present study was to examine the dependence of the lactation duration and efficiency on the season of lambing (January—Group I/June—Group II) in relation to the hormonal status of milking ewes (Polish Longwool). The possibility of artificial extension of the milking period in late-lambing ewes by application of prolonged day length, 16 h of light–8 h of darkness (16L:8D), was introduced additionally (Group III). Measurements of plasma levels of prolactin and melatonin were used as parameters of season-dependent hormonal regulation of milk production in this seasonally breeding species. Although during the first 28 days of lactation sheep of all groups produced similar amounts of milk (based on the weight gains of the lambs), our results clearly showed that during the period of machine milking (from weaning at 56 day to the dry period) the level of milk production in Group I was almost twice that noted in Group II. Thus, the highest milk yield was obtained from sheep during the period when the days became longer, i.e. from March to May, which was accompanied by an increase in prolactin secretion. In both groups, melatonin secretion was found to increase while milk performance parameters and prolactin secretion decreased during the shortening photoperiod. The sustained decreases in milk production and prolactin secretion were also observed during the autumn months in sheep from Group III, despite the low level of melatonin. The present study showed that time of lambing and related photoperiod length could significantly affect the milk production of sheep that have a clear season of sexual activity. Maintenance of June-lambing sheep under the 16L:8D regime failed to extend the high prolactin level and lactation considerably into the autumn months. The spontaneous decrease in prolactin secretion observed under the long artificial photoperiod indicated for a development of refractoriness, which could also limit the lactation period.     

甘油代替大麦对泌乳中后期奶牛采食量、产奶量和乳质量的影响

文章旨在确定在不影响牛奶产量、牛奶成分、乳脂肪酸组成和牛奶感官质量的情况下,用不同水平甘油代替大麦对泌乳中后期奶牛的影响。试验选择了40头荷斯坦奶牛,采用4×4拉丁方试验设计。在部分混合日粮中,粗甘油替代大麦的含量分别为日粮干物质的0、6%、12%和18%。每天记录个体产奶量、采食量和挤奶频率,每周分析牛奶成分。对新鲜牛奶和贮藏7 d的牛奶样品进行感官分析。部分混合日粮的摄入量随甘油添加水平由0升高至12%,增加近1 kg,甘油由12%升高至18%,减少约1 kg。甘油水平由0升高至6%时,精料摄入量下降0.5 kg。随着日粮中甘油比例的增加,牛奶产量呈线性下降(P<0.05),而牛奶中的脂肪和蛋白质含量呈上升趋势(P=0.08),导致能量校正乳水平随甘油水平的升高表现为二次曲线效应,其中6%甘油组产量最高,18%甘油组产量最低。蛋白质和乳糖产量随日粮中甘油比例的增加线性下降(P<0.05)。随着日粮甘油比例的增加,牛奶中棕榈酸、油酸、亚油酸、亚麻酸和共轭亚油酸的比例线性下降(P<0.05),而短链和中链脂肪酸的比例大部分呈上升趋势。综上所述,甘油作为一种能量饲料可以在不影响牛奶品质的前提下,在泌乳中后期奶牛日粮中替代大麦的水平高达18%。但日粮甘油水平超过12%时可能会降低能量校正乳的产量。     

圆叶决明草粉替代不同比例精料喂兔效果研究

利用豆科牧草圆叶决明Chamaecrista routundifolia CPI34721草粉分别以10%,15%,20%不同比例替代精料进行肉兔喂养试验.试验结果表明:与对照相比较,在兔只平均日增重、饲料利用率方面,各处理与对照差异不显著.替代10%和15%精料处理可显著提高兔肉品质,替代20%精料的处理在经济效益方面最佳,可提高经济效益5.15%.     

Characterization of an intravenous lipopolysaccharide inflammation model in calves with respect to the acute-phase response

Our objective was to develop a lipopolysaccharide (LPS) inflammation model in calves to evaluate the acute-phase response with respect to the release of pro-inflammatory cytokines and acute-phase proteins, fever development and sickness behaviour. Fourteen 4-week-old male Holstein Friesian calves were included and randomly assigned to a negative control group (n = 3) and an LPS-challenged group (n = 11). The latter received an intravenous bolus injection of 0.5 μg of LPS/kg body weight. Blood collection and clinical scoring were performed at 0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 5, 6, 8, 12, 18, 24, 28, 32, 48, 54 and 72 h post LPS administration (p.a.). In the LPS group, the following clinical signs were observed successively: tachypnoea (on average 18 min p.a.), decubitus (29 min p.a.), general depression (1.75 h p.a.), fever (5 h p.a.) and tachycardia (5 h p.a.). Subsequent to the recovery from respiratory distress, general depression was prominent, which deteriorated when fever increased. One animal did not survive LPS administration, whereas the other animals recovered on average within 6.1 h p.a. Moreover, the challenge significantly increased plasma concentrations of tumour necrosis factor-α, interleukin 6, serum amyloid A and haptoglobin, with peaking levels at 1, 3.5, 24 and 18 h p.a., respectively. The present LPS model was practical and reproducible, caused obvious clinical signs related to endotoxemia and a marked change in the studied inflammatory mediators, making it a suitable model to study the immunomodulatory properties of drugs in future research.