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我省的肉牛改良工作始于70年代．经20多年的发展我省的肉牛业从无到有．已成为最具发展潜力的畜牧产业。肉牛改良工作本身也获得了巨大的发展。由最初的政府牵动转为市场5;导。改良杂交方法也从任意为主转向科学规划、这里仅就当前改良工作的现状及今后发展趋势谈一点看法。l我省引入的肉牛品种在过去的20多年中．我省以不同方式5;入的肉牛品种有十几个．但在我省有广泛影响的品种只有夏洛来牛、利木赞牛和西门塔尔牛。2引入肉牛品种在我省的利用情况2．回夏洛来肉牛的利用情况夏洛来肉牛是目前在我省最受欢迎的肉牛品种。在我省的肉牛杂… 相似文献
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<正>1肉牛改良的基本情况肉牛业是内蒙古畜牧业的重要组成部分,具有悠久的历史,肉牛的品种资源丰富,有一批地方良种、培育品种和引进品种,为肉牛业的发展提供了重要的基础条件。改革开放以来,内蒙古肉牛总量保持较高的增长速度。"十二五"期间,内蒙古肉牛存栏和牛肉产量持续增长,发展速度明显加快。2015年肉牛存栏829.8万头,比2010年增长38.7%;出栏326.4万头,牛肉产量52.9万吨,比2010年增长6.4%。牛肉产量 相似文献
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<正>美国肉牛业发展的历程和经验表明,肉牛产业的形成和发展是一个渐进的过程,我省要实现肉牛产业的大发展,就要遵循肉牛业发展的规律,有计划、有步骤地制定和推进肉牛业发展战略,构建起肉牛生产、牛肉加工、流通和消费的连接机制。 相似文献
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我国的肉牛业生产正掀起一个质量和规模发展的新高潮，牛肉产量持续增长。据国家统计局预测，2004年我国的牛肉消费量和牛肉价格仍将稳中有升，这将促进农民饲养肉牛(尤其是杂交牛)的积极性。各地农牧民在选择饲养肉牛的品种、类型或选择杂交公牛品种时，应充分考虑当地的气候环境、自然资源、肉牛业生产社会化基础，根据当地的实际情况来选择 相似文献
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目前．我省乃至我国经济发展很快．对牛肉甚至高档牛肉的需求日益增高。为发展我国肉牛业提供了经济需求。我省的自然资源、气候条件与阿尔伯塔甚至北美西部极为相似．理应成为我国肉牛业生产的主产区和重要生产基地。尤其是通过发展养牛业——节粮型畜牧业。利用反刍动物将其它牲畜不能直接利用的粗饲料转化为营养价值高的食品．解决农区存在的秸秆利用与应用问题．显然具有重要的经济意义。加拿大现代肉牛业育种经过了几十年的漫长的路程,走出了一条肉牛育种成功之路．有一整套比较完整的经验．已成为世界上肉牛业最发达国家之一,对我省肉… 相似文献
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建立肉牛肥育场是促进黄牛改良的关键王守君杨忠林迟晓红（黑龙江省鸡西市家畜繁育指导站近年来，随着城乡人民生活水平的提高以及牛肉消费需求的增加，肉牛业的发展已成为必然趋势。黄牛改良也成为养牛业迫切需要解决的问题。国内缺乏优良的肉牛品种，所以必须遵循的基本... 相似文献
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《饲料工业》2019,(18):54-58
应用电感耦合等离子-质谱技术(ICP-MS),建立饲料中钠、镁、铬、锰、铁、铜、锌、砷、硒、镉和铅等元素的测定方法。对饲料样品的前处理方法、仪器工作参数和11种元素标准曲线进行优化;并以加标回收、分析方法比对和重复测试说明方法的准确性和精密性。方法在0～1 000 ng/ml范围内线性良好,仪器检出限为0.557 7～5.072 ng/ml,具有良好的精密度,其回收率在88.1%～104.4%之间,相对标准偏差小于5.0%。同时与原子吸收和原子荧光方法进行比对,测定结果相近。所建立的方法简单、快速,可替代原子吸收和原子荧光方法测定饲料中的11种金属元素,为饲料的质量控制提供理想的元素分析方法。 相似文献
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In experiment 1, 6 pregnant mares received a concentrate that contained a trace mineral premix that provided 14.3 mg Cu, 40 mg Zn, 28 mg Fe, 28 mg Mn, 0.08 mg Co, 0.16 mg I, and 0.16 mg Se/kg concentrate (group A). Seven mares received the same concentrate plus 502 mg Zn and 127 mg Cu once daily (group B). No differences (P > .05) in foal growth data, or Cu, Zn, and Fe concentrations of mare milk, mare serum, or foal serum were observed. In experiment 2, 6 pregnant mares received the same concentrate as group A (group C), and 8 mares received the same concentrate fortified with 4× the trace mineral premix (group D). Group C mares had higher serum Zn concentration at 1 day (P < 0.01) and 56 days (P < 0.04). Group C mares had higher milk Fe concentration at 28 days (P < .01), and group D mares had higher milk Cu concentration at 56 days (P < .01). Group C foals had higher serum Cu concentration at 14 days (P < .03). The results from this study provide no evidence to indicate that supplementing late gestating and lactating mares with higher dietary trace mineral levels than those recommended currently by NRC has any influence on foal growth and development, or on the Cu, Zn, and Fe concentrations of the mare milk, mare serum, or foal serum. 相似文献
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Breed differences for weight (CW), height (CH), and condition score (CS) were estimated from records (n = 12,188) of 2- to 6-yr-old cows (n = 744) from Cycle IV of the U.S. Meat Animal Research Center's Germplasm Evaluation (GPE) Program. Cows were produced from mating Angus and Hereford dams to Angus, Hereford, Charolais, Shorthorn, Galloway, Longhorn, Nellore, Piedmontese, and Salers sires. Samples of Angus and Hereford sires were 1) reference sires born from 1962 through 1970 and 2) 1980s sires born in 1980 through 1987. The mixed model included cow age, season of measurement and their interactions, year of birth, pregnancy-lactation code (PL), and breedgroup as fixed effects for CW and CS. Analyses of weight adjusted for condition score included CS as a linear covariate. The model for CH excluded PL. Random effects were additive genetic and permanent environmental effects associated with the cow. Differences among breed groups were significant (P < 0.05) for all traits and were maintained through maturity with few interchanges in ranking. The order of F1 cows for weight was as follows: Charolais (506 to 635 kg for different ages), Shorthorn and Salers, reciprocal Hereford-Angus (HA) with 1980s sires, Nellore, HA with reference sires, Galloway, Piedmontese, and Longhorn (412 to 525 kg for different ages). Order for height was as follows: Nellore (136 to 140 cm), Charolais, Shorthorn, Salers, HA with 1980s sires, Piedmontese, Longhorn, Galloway and HA with reference sires (126 to 128 cm). Hereford and Angus cows with reference sires were generally lighter than those with 1980s sires. In general, breed differences for height followed those for weight except that F1 Nellore cows were tallest, which may in part be due to Bos taurus-Bos indicus heterosis for size. 相似文献
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液相色谱-串联质谱法测定动物尿液中11种β-受体激动剂残留量的不确定度评估 总被引：1，自引：1，他引：0
采用液相色谱-串联质谱法测定动物尿液中11种β-受体激动剂残留量,对标准溶液、体积、质谱峰面积、浓缩过程及回收率等测定不确定度因素进行了分析,通过评定各不确定度分量及标准不确定度,得出11种β-受体激动剂的扩展不确定度在0.7 ～ 1.1 ng/mL范围内.由各因素对合成不确定度的贡献比分析可知,影响较大的因素为试验回收率及标准溶液浓度. 相似文献
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K Reifenberg M Stahl U L?sch 《Zentralblatt für Veterin?rmedizin. Reihe B. Journal of veterinary medicine. Series B》1989,36(3):191-198
A simple two step procedure for the isolation of caprine, ovine, bovine, equine, canine, porcine and human peripheral blood granulocytes is described. After enrichment of granulocytes by centrifugation, contaminating erythrocytes are lysed hypotonically. Recovery, purity, and viability of the granulocyte suspensions are determined. FACScan analysis of the cell suspensions measuring cellular size by forward and sideward light scatter is compared with the corresponding analysis of whole blood leukocytes. Constituencies of the isolated cell suspensions and loss of granulocyte subpopulations through isolation procedure is discussed with regard to granulocyte function assays. 相似文献