能量水平对肉牛育肥性能的影响

本试验旨在研究日粮不同能量水平对肉牛前期育肥性能的影响.试验选择40头体况良好、健康的、体重一致的肉牛按照随机分组原则分为4个能量水平组(6.05、6.52、7.04、7.55 MJ/kg),每组10头肉牛.试验期为120 d.结果表明:日粮不同的能量水平对肉牛试验末体质量有提高趋势,但试验3组除外;肉牛采食量随着日粮...     

快速育肥肉牛技术

将成年牛经过短期强度育肥,然后屠宰,供应市场或交售外贸收购部门,是农民致富的一条好途径。育肥前的准备 1、牛的选择:淘汰的公牛,不孕的母牛,低产的乳牛,停止使役的耕牛等,都可进行育肥。青壮年牛食草能力强,肥育效果好,年老体弱者一般效果较差,但适当调     

提高肉牛育肥效果的途径

近年来,随着全国性“肉牛热”的兴起,群众性的季节性育肥肉牛和短期育肥肉牛已成热门,肉牛已跻居与奶牛、生猪等经济家畜同等重要地位,肉牛生产在支柱性产业牛的重要地位已被人们所认识,并逐步由传统饲养向科学化饲养转变,由分散性饲养向专业化、规模化饲养转变.为此,如何利用现代科学养牛技术指导肉牛生产,缩短育肥期,提高增重速度,降低饲养成本,提高经济效益,是肉牛育肥者迫切需要了解和掌握的问题.     

肉牛快速育肥技术

多年来,凤城市大力推广肉牛品种改良、肉牛快速育肥综合配套技术取得显著效果。一头架子牛经过3个多月的快速育肥,日增重可达1500~2000g,育肥期内可以增产牛肉150~200kg。目前全市有年出栏超千头的优质肉牛育肥场15个。肉牛改良及快速育肥技术的普及推广,已成为促进农民增收的支柱产业。现结合养牛生产实践谈一谈肉牛快速育肥技术。1选购好架子牛架子牛的品质是影响肉牛育肥效果的重要因素之一。架子牛通常是指未经肥育或没达到屠宰体况的牛。选择架子牛时要注意选择健壮、早熟、早肥,不挑食,饲料利用率高的牛。应把握好下列几点:1.1健康用…     

肉牛能量和淀粉利用及其对代谢能转化效率、能量、蛋白和脂肪沉积的影响

用4×4拉丁方试验来估计肉牛瘤胃挥发性脂肪酸(VFA)能/小肠可消化能和瘤胃发酵淀粉/小肠消化淀粉对代谢能转化为体增重效果(Kf)、能量沉积、氮沉积及脂肪沉积的影响。结果表明 :随着过瘤胃淀粉的提高 ,肉牛Kf、蛋白质沉积、净能沉积和脂肪沉积均有提高 ,Kf值可以超过60 %。     

复合长效微量元素添加剂对肉用改良牛的育肥效果

选用24头肉用改良牛 ,分为长效瘤胃丸组、常规相应剂量(拌料)组、低剂量组和对照组 ,每组6头牛 ,进行微量元素不同添加方式的试验。试验设7天预试期和73天正试期。试验结果日增重分别为1.054、0.986、0.912和0.887kg,长效瘤胃丸组较对照组提高18.83 % ,较相应剂量(拌料)组多增重7.67个百分点。饲料报酬(NEg MJ/kgG)分别为12.38、13.12、14.17和14.87 ;成本(元)分别为3.506、3.717、4.009和4.209。试验表明 :长效瘤胃丸效果与对照差异极显著 ,比微量元素拌入精料组明显优越。     

添加肉牛补充料对生长牛生产性能及理化指标的影响

6～12月龄生长牛在传统饲养方式下 ,添加肉牛补充料500g,改善了日粮蛋白质、钙、磷和微量元素的营养状况 ,干物质采食量从5.2kg 提高到6.4kg,日增重从373g显著提高到663g(P<0.05) ,单位增重所消耗的饲料从13.94 :1下降到9.65 :1,添加补充料后生长牛血液中的微量元素和理化指标有不同程度的改善。     

STUDIES ON NEMATODE INFECTIONS OF BEEF CATTLE IN NEW SOUTH WALES

The occurrence and seasonal trends of nematode parasite infections in beef cattle on the Tablelands and North Coast regions of New South Wales are described, based on worm counts from 627 spring-born steers slaughtered at 2-monthly intervals from 6 to 24 months of age. The predominant parasites were Ostertagia ostertagi, Trichostrongylus axei and Cooperia spp. Large burdens of adult Ostertagia were seen in 12-month-old animals in late winter and early spring, and later in 18- to 20-month-old cattle in the following late summer and autumn. These infections often resulted in outbreaks of clinical parasitism. Massive numbers of inhibited early fourth stage larvae (EL4) also accumulated in the yearlings during their first spring, reached peaks in mid-summer and then declined. The possibility of their resumption of development to mature worms in the late summer and autumn period is discussed. Adult T. axei showed a similar seasonal trend to Ostertagia and may have increased the severity of outbreaks of clinical disease. Cooperia populations of EL4 and adult worms were highest in weaners during winter, but lower numbers thereafter indicated a strong resistance to re-infection. In addition, Haemonchus placei occurred frequently on the North Coast both as EL4 and adults in cattle of all ages up to 20 months. Of the other cattle nematodes, Oesophagostomum radiatum and Trichuris spp occurred in low numbers, mainly in weaners. Bunstomum phlebotomum and H. contortus occurred sporadically on the North Coast and Tablelands respectively. Intestinal Trichostronglyus spp, Oesophagostomum venulosum and Dictyocaulus viviparus were seen occasionally and Nematodirus spp were not seen. There was a poor relationship between worm counts and faecal egg counts. Cooperia spp dominated the egg counts, while those for other genera were generally low and did not reflect the relative abundance or seasonal changes in worm numbers.     

生长期莎能奶山羊能量代谢研究──Ⅱ.不同环境温度、不同体重和不同代谢能采食量对生长期莎能奶山羊的总产热量及绝食产热量的影响

本研究用15头生长期西农莎能奶山羊（平均日龄为134．5±5．7天，平均体重为18．7±1．05kg），随机分为5组，分别按自由采食，0．8986、0．7189和0．5391MJME／kgW0．75等4个能量水平饲养。通过前期饲养试验和气体能量代谢试验，测定各能量采食水平组的体重、总产热量（THP）和绝食产热量（FHP）。结果表明，环境温度影响生长期莎能奶山羊的绝食产热量。随着环境温度超过等热区而下降时，绝食产热量升高。生长期莎能奶山羊的总产热量受代谢能食入量的显著影响。其每公厅代谢体重的总产热量随着体重的增加而增加。     

东部农业区牛羊育肥调查与分析

通过对海东四县及西宁市三县的牛羊育肥情况调查,认为东部农业区的牛羊贩运育肥是一项新型的发展产业,它不仅促进了畜牧业发展,繁荣了市场,也带动了产业结构的调整,为广大农牧民脱贫致富开辟了发展之路.