共查询到20条相似文献，搜索用时 15 毫秒
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Effect of crossbreeding on fertility,hatchability and embryonic mortality of Nigerian local chickens
Adeleke MA Peters SO Ozoje MO Ikeobi CO Bamgbose AM Adebambo OA 《Tropical animal health and production》2012,44(3):505-510
A total of 970 eggs were collected from matings involving three genotypes of Nigerian local chickens (Normal-feathered, Frizzle-feathered
and Naked neck) and one exotic broiler breeder strain (Anak Titan) to evaluate the effect of crossbreeding on fertility, hatchability
and embryonic mortality. Mating was achieved through artificial insemination. Sire genotype significantly (P < 0.05) affected percent fertility and percent dead-in-shell. Naked neck sire genotype had the highest dead-in-shell (19.5%)
with the least being 7.5% for Frizzle-feathered chickens. Frizzle-feathered sire genotype had the highest fertility (90.5%)
and hatchability (91.4%). Dam genotype had a significant effect (P < 0.01) on fertility and hatchability, with Anak Titan dam having the highest fertility and hatchability of 88.2% and 94.6%,
respectively. Fertility and hatchability were significantly (P < 0.05) influenced by the interactive effect of sire and dam genotypes with Frizzle-feathered × Anak Titan having 98.5% fertility
and 96.8% hatchability. Both straight and reciprocal crosses involving Frizzle-feathered genotype and Anak Titan resulted
in higher mean values for fertility and hatchability when compared to crosses involving the other two local chicken genotypes.
This result suggests that the use of the Frizzle-feathered genotype appears to be more desirable in fertility and hatchability
trials. 相似文献
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Ezeibe MC 《The Veterinary record》2005,156(26):840-842
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Gardner Murray 《Australian veterinary journal》2000,78(6):379-379
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我国拥有81个宝贵的地方鸡品种,具有世界上许多发达国家望尘莫及的品种资源优势。这些地方鸡品种是在极为复杂的生态条件和社会经济文化条件的影响下,我国劳动人民逐渐选育而出的这些鸡种具有不同的生产性能,与国外培育的一些专用鸡种相比,具有广泛的遗传多样性和对周围环境的高度适应性,具有抗逆性强、肉质好、蛋品质优等特点。如：抗逆性强的边鸡、静原鸡;稀有蛋用早熟品种白耳黄鸡、仙居鸡;蛋大、壳厚、体型较大的大骨鸡;骨细、肉嫩、味鲜的文昌鸡、北京油鸡、惠阳胡须鸡等;具有滋补药用功能的丝羽乌骨鸡;善飞翔的藏鸡;以产绿壳蛋为主的东乡绿壳蛋鸡;具有斗性强的河南斗鸡、漳州斗鸡等。这些地方鸡品种既是宝贵的遗传资源,遗传多样性是未来家禽品种改良的遗传基础,也是价值极高的经济资源,为我国家禽业发展提供了基础动力和基本素材。保护家禽遗传资源的多样性对于我国家禽业的可持续发展具有十分重要的意义。 相似文献
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中草药、酸化剂和抗生素对黄羽肉鸡生长性能和肉质风味的影响 总被引：2，自引：1，他引：2
选用60日龄的雌性黄羽肉鸡210只,随机分为7组(每组设3个重复,每个重复10只),研究中草药、速酸肥和黄霉素对其中、后期生长性能及肉质风味的影响。对照组饲以基础日粮,另外6组日粮是在基础日粮中分别添加0.35%中草药、0.70%中草药、0.15%速酸肥、0.30%速酸肥、0.30%速酸肥+0.70%中草药、5mg/kg黄霉素。进行为期60d的饲养试验,观测黄羽肉鸡的生长性能,肉质物理性状,肌肉化学组成、氨基酸和肌苷酸的含量等。结果表明:添加中草药、速酸肥或黄霉素对黄羽肉鸡中、后期的增重无显著影响,但0.35%中草药组、0.30%速酸肥组、0.30%速酸肥+0.70%中草药组黄羽肉鸡的饲料效率显著提高。添加中草药、速酸肥或黄霉素对黄羽肉鸡的屠宰性能、肉质物理性状及肌肉常规养分组成均无显著影响。黄霉素和速酸肥在一定程度上可使肌肉的失水率提高,熟肉率下降,贮存损失增加;而中草药在一定程度上可使肌肉的失水率下降,熟肉率提高,贮存损失减少,从而对肉质物理性状有一定程度的改善。添加中草药、速酸肥或黄霉素可使肌肉中与鲜味和甜味有关的谷氨酸、甘氨酸、苏氨酸、丝氨酸和丙氨酸等氨基酸的含量不同程度的提高;中草药还有使肌肉中肌苷酸的含量增加的趋势。 相似文献
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Serological survey on Newcastle and Gumboro diseases, pasteurellosis and pullorosis in local hens in Niger 总被引：1，自引：0，他引：1
C Courtecuisse F Japiot N Bloch I Diallo 《Revue d'élevage et de médecine vétérinaire des pays tropicaux》1990,43(1):27-29
A serological survey on avian pathology in a village area was carried out in Niger. It allowed to determine the incidence of pullorosis (47%), pasteurellosis (48%), avian bursal disease (47%) and Newcastle disease (14% in non vaccinated and 63% in vaccinated animals). 相似文献
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近年来，随着现代免疫学的迅速发展，其研究领域已深入到分子和基因水平，使人们对免疫系统又有了更深层次的认识 。1981年美国免疫生殖学家Siegel提出了“红细胞免疫系统”的概念，认为红细胞不仅具有呼吸功能，而且具有与白细胞相似的免疫功能。红细胞膜上存在许多与免疫有关的物质， 相似文献
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当前兽药地方标准清理工作已进入攻关阶段,但在清理地方标准的实际工作中尚存在一些问题,笔者分析了这些具体问题,认为在升标工作中,政府应当给予合理的政策扶持,加快地方标准清理工作进度,保护企业利益;企业应当着重做好品种筛选,合理安排临床试验资金投入;企业通过采取联合参与升标方式,减少资金投入;对于移植外省标准,可采取不同措施妥善解决;为保证升标工作顺利进行,农业部和各省兽医行政管理部门应做好升标培训指导工作. 相似文献
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《中国兽医学报》2017,(12):2260-2265
为了研究河北秦皇岛地区鸡致病性大肠杆菌(Escherichia coli,E.coli)地方流行株的优势血清型、毒力基因和致病性,本研究采用常规鉴定方法和16SrRNA PCR方法,从采集自河北秦皇岛地区不同养鸡场的83份病鸡组织中分离鉴定出56株E.coli。人工感染1日龄雏鸡试验表明,46株分离株为致病性E.coli。采用玻片凝集试验、PCR方法分别测定致病性E.coli分离株的血清型分布和16种毒力基因携带情况。结果显示,定型的42株致病性E.coli分离株包括11种血清型,以O7 8、O89、O142及O1为优势血清型;46株致病性E.coli分离株中以irp2、fuyA、ompT、Iss a、iutA、iroN和hlyF毒力基因检出率较高,在89.1%~100.0%,其他毒力基因检出率为22.0%~72.0%。选择优势血清型代表株QH1(O78)、QH1(O89)、QH1(O142)和QH1(O1)人工感染1日龄雏鸡,计算半数致死量(LD50),确定其致病性。结果表明,QH1(O78)株致病性最强,对1日龄雏鸡的LD50为3.16×106 CFU/mL;对14,49日龄雏鸡的LD50分别为1.07×107,5×108 CFU/mL。本研究为河北秦皇岛地区鸡致病性E.coli地方流行株防控提供试验依据。 相似文献
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农业部兽医局药政处徐士新处长在“兽药地方标准清理研讨班”的讲话中提出：清理地方标准；加快GMP验收步伐；严厉打击假冒伪劣产品；完善各项配套规章将是药政处2005年工作的重点。 相似文献
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广西本地黄牛的胚胎移植试验 总被引：1，自引：0，他引：1
本试验通过PG一次法,PG二次法以及PG结合PMSG法分别对广西本地黄牛进行同期发情处理.结果表明,二次法可显著提高本地黄牛的同期发情率,而PG结合PMSG法则可显著提高受体牛的可移植率及胚胎移植的受胎率. 相似文献
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A field study on feed supplementation, body weight and selected blood parameters in local pigs in Laos 总被引：1，自引：1，他引：0
Malavanh Chittavong Jan Erik Lindberg Anna Jansson 《Tropical animal health and production》2013,45(2):505-510
The aim of the present study was to investigate feed allowances, body weight (BW), haematocrit, haemoglobin, plasma ionised calcium (iCa), sodium, potassium, pH and glucose concentration and faecal K/Na ratio in local growing pigs, sows and piglets kept by small-holder farmers in Laos. Starting hypotheses were that (1) local pigs are under fed, (2) BW is higher in pigs receiving supplementary feed and (3) the blood profile of pigs subjected to very poor nutrition is outside the normal range. On 54 pig-keeping smallholdings in Borikhamxay province, Lao PDR, daily feed allowances were weighed and BW recorded for 27 lactating sows, 54 piglets and 27 growing pigs. Blood samples were collected from the vena jugularis in all pigs. Feed supplementation did not affect BW, but plasma iCa concentration was outside the normal range for all pigs. There was a tendency for lower faecal K/Na ratio in Na-supplemented sows. The results confirm that local pigs in small-scale production systems in Laos suffer from poor nutrition. The most important challenge for farmers appears to be provision of more feed, particularly feed with a high Ca content. 相似文献