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高效饲料蛋白率代替部分棉仁粕对高温期奶年产奶量的影响 总被引:1,自引:0,他引:1
高效饲料蛋白素由羟甲基尿素和微量元素组成,试验证明,在混合精料中添加1.5%高效饲料蛋白素、4%玉米、3.5%粉麸,以代替9%的棉仁饼,对牛奶产量没有不良的影响,且对因高温引起的产奶量自然政策有一定的稳定和缓冲作用,试验组下降幅度为6.78,而对照组为10.46%。 相似文献
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影响对虾生长的抗营养素研究 总被引:4,自引:0,他引:4
研究对虾配合饲料中的抗营养素:抗胰蛋白酶、棉酚、酸败油脂、黄曲霉毒素对对虾生长的影响。发现抗胰蛋白酶抑制对虾生长,以冷榨豆饼为蛋白源的饲料所喂对虾的增重率为84 % ,以热榨豆饼为蛋白源的饲料所喂对虾的增重率为103 % ;棉酚对对虾生长的抑制作用不明显,以棉籽饼为蛋白源养虾其增重率与冷榨花生饼相似;将酸价为0 .2mg/g 、8 .0mg/g 、22.4mg/g 、31 .0mg/g 的鱼油添加到配合饲料中养虾,增重率依次为72.4 % 、57 .0% 、29.2 % 、27.5 % ,消化率依次为83 .1% 、59.6 % 、58 .0% 、53 .0 % ;黄曲霉毒素严重影响对虾生长,用含黄曲霉毒素B1472 ×10 9 、78 .7×10 9 的饲料养虾,其增重率仅为对照组的43.9% 、45 .4% ,而且消化率、成活率均下降。 相似文献
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1概述 奶牛是一种草食动物,可以把大量粗饲料、青草、农作物秸秆以及食品加工副产品转化成高质量的动物性食品──牛奶和牛肉。在人们饲养的各种畜禽中,奶牛把饲料转变成人们能吃食物的能力最强、效率最高。以蛋白质为例,把饲料蛋白转换成动物蛋白,奶牛(产奶)的转换率为26.3%,蛋鸡(产蛋)为23%,肉用仔鸡(产肉)为22.8%,猪为15.5%,而肉牛仅为5.3%,并且可以利用非蛋白氮,转化为动物蛋白。奶牛将饲料中能量转化为食品能量,也是所有家禽中最高,同时也是饲养畜禽中经济效益最好的。在城市附近饲养奶牛,… 相似文献
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在1440只星杂579蛋鸡日粮中添加3%、5%、8%、1l%的GSD-高效水解蛋白饲料替代进口鱼粉和豆粕,进行103无的饲养试验。结果表明,日粮添加5%GSD-高效水解蛋白饲料和合成氨基酸时,产蛋性能比添加3%GSD-高效水解蛋白饲料高,饲料成本亦最低。蛋鸡日粮中添加GSD-高效水解蛋白饲料对产蛋高峰有影响,但5%的添加量不影响产蛋鸡的健康。 相似文献
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本试验比较了不同抗生素对肉鸡生长速度和抗病力的影响。试验分为4个组,第1组采用正大肉鸡料510、511、513为对照组,第2、3、4组为试验组,分别添加土霉素、杆菌肽锌+硫酸粘杆菌素、硫酸粘杆菌素,4个组饲粮营养成分的分析结果基本相同。2000只爱拔益加肉鸡分4个处理,每个处理5个重复,每个重复100只鸡。试验结果证明,4个组鸡只成活率有显著的差异(P<0.01),分别为87.7%、94.9%、93.3%、89.7%。4种料的增重效果也有较大的差异。土霉素组与杆菌肽锌+硫酸粘杆菌素和硫酸粘杆菌素组比较,日增重依次提高11.6%、10.2%。料肉比组间差异极显著(P<0.01),以杆菌肽锌+硫酸粘杆菌素料组为最低,其次为上霉素组、硫酸粘杆菌素组,正大组饲料报酬最高。增重的饲料成本依次为4.83元/kg、4.52元/kg、4.55元/kg、4.75元/kg。与产品效益相联系综合分析结果,杆菌肽锌+硫酸粘杆菌素组饲料和硫酸粘杆菌素组饲料的经济效益较好。 相似文献
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《兽药与饲料添加剂》2002,7(4):43-43
一般来说,养蛋鹑的饲料比养鸡的饲料要求蛋白质含量高5%~6%,否则就会影响产蛋率。二是要做到饲料稳定,不能随意变换,以防减食影响产蛋。三是注意钙质的供给,以免生软壳蛋。饲料配方:玉米52%、豆饼27%、鱼粉10%、麸皮5%、骨粉1%、多维素1%、土霉素钙盐1.5%、微量元素1%。雏鹌鹑的日采量,1~2日龄3克,3~7日龄5~10克,8~11日龄13~15克,12~15日龄16~18克,17~21日龄22~25克。产蛋鹑,每天每只要吃精料20克。常用的饲料配方:玉米53.5%、豆饼22%、麸皮3.… 相似文献
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为了寻找解决办法,引导农民加快奶畜生产,我们于11月16日到23日,对陇县8个乡镇17个奶牛重点村、3个奶牛园区的奶牛存栏、牛群结构、产奶性能、养牛效益、鲜奶收购价格以及饲养中存在的问题进行了全面调查。结果表明,奶牛养殖小区产奶量和生产效益都明显高于散养奶牛。说明集约化乃是今后的发展方向。 相似文献
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Milk and milk fat production per cow were studied on 17 Fillmore County, Minnesota, Dairy Herd Improvement Association dairies before and after the source of drinking water for cows was changed by the drilling of a new well. New wells were in deeper aquifers which were more protected from waterborne pollutants; the former wells were in shallow, easily polluted aquifers. Seventeen other dairies with swallow wells served as controls, matched for pre-well milk production per cow, dairy location, and breed of cow. The changes in milk and milk fat production per cow after the drillingof a new well were not statistically significant. 相似文献
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Hernandez J Risco C Donovan A 《Journal of the American Veterinary Medical Association》2001,219(5):632-635
OBJECTIVE: To determine association between exposure to Neospora caninum and milk production in dairy cows. DESIGN: Prospective observational study. Animals: 565 Holstein cows. PROCEDURE: Cows were classified as seropositive or seronegative to N. caninum within 7 days after calving by use of a kinetic ELISA. Milk production was compared between seropositive and seronegative cows. RESULTS: On the basis of 305-day mature equivalent milk production data, seropositive cows produced less milk (2.8 lb/cow per day) than did seronegative cows. In addition, analysis of results throughout the first 300 days of lactation revealed that after adjusting for effects of lactation number, calving season, clinical mastitis, and lameness, milk weight of seropositive cows was 2.5 lb/cow per day less than that of seronegative cows. CONCLUSIONS AND CLINICAL RELEVANCE: Exposure to N. caninum was associated with a 3 to 4% decrease in milk production. A decrease in milk production of 800 lb/cow for a typical 305-day lactation represents a loss of $128/cow. 相似文献
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加入WTO后我国乳牛业面临的挑战与对策 总被引:1,自引:1,他引:0
随着中国加入WTO后乳制品进口关税的不断减让,发达国家看好我国的乳制品市场,大量国外的乳制品进入中国市场将冲击中国的乳牛业。本文通过分析我国乳牛业的发展现状和入世后我国乳牛业面临的挑战,提出我国乳牛业长远的发展战略。 相似文献
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通过总结红瓦房草地奶牛试验示范区多年的工作,阐述了搞好配套技术服务,开展实用技术培训,提高科学技术水平,强化饲草饲料基础建设,以草为主适应补料,提高产奶量和经济效益的做法和经验。 相似文献
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Associations between dairy production indices and lipoarabinomannan enzyme-immunoassay results for paratuberculosis. 总被引:3,自引:0,他引:3 下载免费PDF全文
W B McNab A H Meek S W Martin J R Duncan 《Canadian journal of veterinary research》1991,55(4):356-361
Data from an epidemiological study in Ontario, involving 304 dairy herds, were used to identify associations between selected production indices and lipoarabinomannan antigen serological test results for paratuberculosis (LAM-ELISA). Analyses were conducted at both the herd and individual cow levels of organization. After analytically controlling for management and cow factors in the respective regression models, positive serological paratuberculosis status (as defined by the LAM-ELISA test), was associated with higher milk somatic cell counts at both the herd average (p less than 0.01), and individual cow levels of organization (p less than 0.0001). In contrast, LAM-ELISA test results were consistently not associated with calving intervals in either the herd average or individual cow level analyses. Associations between LAM-ELISA results and milk production were inconsistent. No associations were found at the herd level of organization, and LAM-ELISA results were not associated with a change in breed class average (BCA) for milk, between the previous and the most recent lactations of individual cattle. However, at the individual cow level, LAM-ELISA results were positively associated with higher milk production as measured by the current BCA (p less than 0.05), and individual cow average kg of milk produced per year of life since two years of age (p less than 0.0001). 相似文献
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本试验旨在研究复合酶对奶牛产奶量和乳成分的影响。选择胎次、泌乳天数、产奶量相近的健康荷斯坦泌乳牛30头,随机分为2组,即试验组和对照组,试验组每日在TMR中添加复合酶制剂50g。结果显示,试验组奶牛日均产奶量对比照组提高了6.6%,差异显著(P〈0.05);试验组乳蛋白率比对照组提高0.19%,差异显著(P〈0.05),乳脂率比对照组提高0.3%,差异显著(P〈0.05),乳糖含量比对照组提高0.2%;经济效益每天每头奶牛比对照组多盈利3.88K。说明每日在奶牛TMR中添加50g复合酶,可提高奶牛产奶量,改善牛奶品质,增加经济效益。 相似文献