五月份蛋鸡行情分析及预测

去年受三聚氰胺的影响,鸡蛋价格在后半年基本是低价位运行,导致蛋鸡养殖业行情急剧下滑.蛋鸡养殖数量较多,蛋量充足,但是市场需求清淡,供大于求.到了2009年,三聚氰胺事件基本告一段落,禽流感疫情也得到了很好的控制.蛋鸡养殖业渐渐复苏,目前鸡蛋以及淘汰鸡的价格也略微上涨.     

蛋鸡养殖形势依旧严峻

<正>去年受三聚氰胺的影响,鸡蛋价格在后半年基本是低价位运行,导致蛋鸡养殖业行情急剧下滑。蛋鸡养殖数量较多,蛋量充足,但是市场需求清淡。好不容易挨到了2009年,三聚氰胺事件基本告一段落,禽流感疫情也得到     

鸡蛋、玉米近期走势浅析

告别三聚氰胺,又迎来人感禽流感,一波未平。一波又起,对蛋鸡养殖业来说,一艰难前行,委靡不振,养殖户更是满眼迷茫,进退两难。由于2007年上半年补栏充足,造成2008年供大于求,价格难以上涨。接着,又出现三聚氰胺事件。造成一时间鸡蛋价格滞销,价格又一次跌入低谷。紧接着。受全球金融危机影响,农产品价格下行压力增大,鸡蛋价格又一次受到影响,使很多新加入的养殖户无力承受连续的赔钱压力,低价淘汰蛋鸡,或退出养殖行业。很多老养殖户也减少存栏量,以降低损失。     

山东省2009年蛋鸡行业调查报告

2008年，我国的蛋鸡生产可以说是在高成本低效益下运行的。山东的蛋鸡生产也是如此。2008年山东的蛋鸡生产，上半年价格低，6月末价格上涨，养殖效益好转。10月份受“三聚氰胺”事件影响，鸡蛋价格下跌，蛋鸡饲养处在盈亏平衡状态。     

2008上半年蛋鸡养殖形势展望

2007年,对于蛋鸡养殖业来说,是大起大落的一年.由于2006年禽流感的影响导致蛋鸡存栏量不足,2007年上半年,全国鸡蛋价格普遍高涨;随着蛋鸡的持续性补栏,下半年又出现供大于求现象,导致鸡蛋价格出现跌入低谷现象.从9月下旬开始至12月份,连续3个月时间鸡蛋价格低迷,目前也没有出现明显的上涨迹象,养鸡行业一片冷清,而同期饲料价格却持续上涨,蛋鸡养殖进入微利甚至赔钱的艰难徘徊时期.未来一段时期内,蛋鸡养殖将经历严酷考验,养殖形势并不乐观.     

2007年禽蛋业生产形势回顾及后市预测

年终岁末,回过头来看,今年的蛋鸡养殖业可以用"三起三落"来描述市场行情的变化,鲜鸡蛋、淘汰鸡价格持续走高,全国鸡蛋主产地(河北、辽宁、山东等)平均价格均居十年来同期最高。2007年,鲜鸡蛋、淘汰鸡价格是近年来难得的好价位,蛋鸡养殖户迎来了一个利好的年度。随着气候的转冷,鸡蛋和淘汰鸡行情也进入了"冬季"。     

禽类市场价格变化的分析及预测

2007年,对于肉鸡蛋鸡养殖业来说,应属于大起大落的一年。蛋鸡:5月份全国鸡蛋价格整体上涨,出现了节后价格仍然持续上涨现象,且价格达到了全年峰值;肉鸡:春夏季节,肉鸡价格持续乐观,进入9月份出现连续下跌态势。进入10月份,鸡蛋、肉鸡价格整体低迷,进而达到谷底。     

蛋鸡生产形势分析

一蛋鸡行业的市场现状 2007年对于蛋鸡养殖业来说，整体看好，从下列各图可以看出，今年鸡蛋价格与去年同期相比上涨幅度在36％左右，淘汰鸡价格涨幅在65％左右。分析其原因，一方面由于猪肉价格的持续上涨，拉动了鸡蛋价格；     

蛋鸡养殖2011年业发展趋势与行情预测

目前很多业内人士对于2011年我国蛋鸡的市场前景非常乐观,认为形势一片大好,蛋鸡养殖业已经踏上了亮闪闪的金光大道。确实,我国蛋鸡养殖业经过近两年拿行业的整体亏损后,鸡蛋价格猛涨到了每千克8元以上的价格,个别省市甚至达到了每千克10元的价格。这非常值得我们所有从业者高兴,值得我们欢呼雀跃。     

提高中小规模蛋鸡养殖场经济效益的措施

我国近10年鸡蛋是唯一没有涨价的食品,主要原因是蛋鸡存栏量增加幅度较快,市场基本处于饱和状态。但是饲料原料价格和人力等成本却成倍增长,再加之鸡病不断增加,蛋鸡养殖业成为一种高投入、低利润的行业，     

电感耦合等离子-质谱法测定饲料中钠、镁、铬、锰、铁、铜、锌、砷、硒、镉和铅

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。     

Supplementation of broodmares with copper, zinc, iron, manganese, cobalt, iodine, and selenium

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.     

Comparisons of Angus, Charolais, Galloway, Hereford, Longhorn, Nellore, Piedmontese, Salers, and Shorthorn breeds for weight, weight adjusted for condition score, height, and condition score of cows

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.     

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

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.     

Granulocyte isolation from whole blood of goat, sheep, cattle, horse, dog, pig, and man

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.