新扬州鸡IGF-1基因多态性与早期生长速度关系的研究   总被引：9，自引：2，他引：9  

王志跃  范刚  杨海明  汪张贵  盛东风  刘桂琼 《中国家禽》2004,26(24):9-12

以150只非同胞新扬州鸡为材料，采用PCR—RFLP法检测了该基因5’调控区DNA序列多态性，并运用线性模型统计方法分析了多态性与初生重和12周龄体重的关系。结果显示：新扬州鸡IGF-1基因5、调控区自然存在两种不同DNA序列，经。PstⅠ酶切后出现3种基因型(“-／-”、“-／ ”、“ ／ ”)，基因型分布符合哈代一温伯格定律。各基因型个体的初生重、12周龄体重的最小二乘均数存在“-／-”＞“ ／-”＞“ ／ ”的趋势，且“-／-”型个体的12周龄体重显著高于“ ／ ”型个体(P＜0．05)。  相似文献   

二丁酰环腺苷酸对猪胴体组成和肉品质的影响   总被引：1，自引：0，他引：1  

张曦  高士争  程美玲  刘勇  严达伟 《中国畜牧杂志》2004,40(5):20-22

通过皮下注射和饲料添加不同剂量dbcAMP进行饲养试验 ,研究其对肥育猪胴体组成和肉品质的影响。结果表明 :皮下注射 1.0mg/kg和饲料添加 2 0mg/kg对改善肥育猪的胴体组成和肉品质效果最好 ,眼肌面积分别提高31.99%和 36 .39% (P <0 .0 5 ) ;瘦肉率分别提高 12 .4 2 %和 11.94 % (P <0 .0 5 ) ;背膘厚分别降低 19.95 %和 2 0 .97%(P <0 .0 5 )。肌肉粗蛋白含量分别提高 10 .87%和 16 .5 4 % (P <0 .0 5 )。  相似文献   

IMAGING DIAGNOSIS: MAGNETIC RESONANCE IMAGING OF A CERVICAL WOODEN FOREIGN BODY IN A DOG     

Benjamin Young  DVM    Lisa Klopp  DVM  PhD    Mark Albrecht  DVM  DACVS    Susan Kraft  DVM  PhD 《Veterinary radiology & ultrasound》2004,45(6):538-541

This article describes the discovery of a chronic cervical wooden foreign body ventral to the left transverse processes of the cranial cervical spine using magnetic resonance imaging (MRI) in a dog that presented with chronic neck pain and lameness. The dog did not exhibit dysphagia or chronic draining tracts, the most common signs of the presumed cause, that of a penetrating oropharyngeal foreign body. The foreign body itself was represented on MR images as an oval straight-edged core within an inflammatory tissue reaction. The wood was slightly hyperintense on T2- and isointense on T1-weighted images relative to muscle. Surrounding this was a more conspicuous contrast-enhancing reactive tissue rim that was hyperintense on all pulse sequences. Adjacent musculature also exhibited diffuse edema and contrast enhancement that extended around the left cervical vertebral transverse processes and local intervertebral nerve roots. The foreign body was found to be a wooden stick upon surgical removal. MRI is an excellent method for visualizing the inflammatory tissue reactions associated with soft-tissue foreign bodies because of its contrast resolution and depiction of anatomy in multiple imaging planes.  相似文献   

美系杜洛克种猪体尺、体重测定与体型评定研究     

刘康柱  刘崇林  胡建红 《畜牧兽医杂志》2005,24(5):1-2

统计分析了2001年引进的新美系杜洛克种猪及繁殖后代在6月龄、12月龄、24月龄和36月龄四个阶段的体尺、体重数据，结合品种特征、体型外貌总结研究出杜洛克种猪的百分制评分及等级标准。  相似文献   

Prediction of chemical composition and peroxide value in unground pet foods by near‐infrared spectroscopy          下载免费PDF全文

M. De Marchi  F. Righi  M. Meneghesso  D. Manfrin  R. Ricci 《Journal of animal physiology and animal nutrition》2018,102(1):337-342

The massive development of the pet food industry in recent years has lead to the formulation of hundreds of canine and feline complete extruded foods with the objective of meeting both the needs of the animals and numerous demands from pet owners. In the meantime, highly variable raw material compositions and the industry's new production techniques oblige manufacturers to monitor all phases of the extrusion process closely in order to ensure the targeted composition and quality of the products. This study aimed at evaluating the potential of infrared technology (visible and near‐infrared spectrophotometer; 570–1842 nm) in predicting the chemical composition and peroxide value (PV) of unground commercial extruded dog foods. Six hundred and forty‐nine commercial extruded dog foods were collected. For each product, an unground aliquot was analysed by infrared instrument while a second aliquot was sent to a laboratory for proximate analysis and PV quantification. The wide range of extruded dog food typologies included in the study was responsible for the wide variability observed within each nutritional trait, especially crude fibre and ash. The mean value of the 208 pet foods sampled for PV quantification was 17.49 mEq O₂/kg fat (min 2.2 and max 94.10 mEq O₂/kg fat). The coefficients of determination in cross‐validation of NIRS prediction models were 0.77, 0.97, 0.83, 0.86, 0.78 and 0.94 for moisture, crude protein, crude fat, crude fibre, ash and nitrogen‐free extract (NFE) respectively. PV prediction was less precise, as demonstrated by the coefficient of determination in cross‐validation (0.66). The results demonstrated the potential of NIRS in predicting chemical composition in unground samples, with lower accuracy for moisture and ash, while PV prediction models suggest use for screening purposes only.  相似文献   

中草药牛蒡子化学成分及药理研究进展     

边巴次仁  尼玛仓决  赤列旺久  常瑛  何斌 《中国兽药杂志》2018,52(9):67-74

牛蒡子是一种常用中药,性寒,味辛、苦,归胃、肺经,具有疏散风热、宣肺透疹的功效,临床上用于治疗外感风热、咳嗽气喘、咽喉肿痛等症。综述了牛蒡子的主要化学成分木脂素类、挥发油类、脂肪油类及帖类及其抑菌、抗病毒、抗肿瘤、治疗肾病、降血糖等众多药理作用现状,旨在为牛蒡子的化学成分及其药理作用的研究与开发提供参考,指导传统中草药牛蒡子在畜牧业养殖生产中的临床应用。  相似文献   

耕作方式与长期定位施肥对雨养农田冬小麦产量的调控效应   总被引：1，自引：0，他引：1  

张建军  樊廷录  赵刚  党翼  王磊  王勇  李尚中  程万莉 《草业学报》2018,27(7):175-186

为了明确西北黄土高原半湿润偏旱区耕作方式与长期定位施肥对冬小麦产量的调控效应,以设在半湿润偏旱区连续12年的耕作与肥料长期定位试验为平台,采用裂区设计,以传统耕作和免耕耕作为主处理,不施肥(CK)、单施无机氮肥(N)、单施无机磷肥(P)、单施有机肥(M)、无机氮磷肥配施(NP)、有机无机肥配施(NMP)为副处理,栽培制度为1年春玉米-3年冬小麦轮作,研究耕作及施肥措施对冬小麦产量的影响及其在生产年型间的变化关系。结果表明,不同年型及耕作方式均以有机无机配施冬小麦产量最高,有机肥单施高于化肥单施,磷肥单施高于氮肥单施。耕作方式间表现为传统耕作高于免耕耕作,年型间表现为丰水年>平水年>干旱年,耕作和施肥方式的增产效果以干旱年最好,平水年和丰水年差异不显著。有机无机配施与传统耕作结合优化了冬小麦冠层温度、叶绿素相对含量等生理指标,提高了光合速率、气孔导度及蒸腾速率,因而改善了有效穗、穗粒数和千粒重等产量性状而使冬小麦增产。在550 mm左右降水量的陇东旱塬雨养农业区,无论何种耕作方式及生产年型,长期采用有机无机或无机氮磷肥配施均表现出持续提高冬小麦产量的良好作用。因此,有机无机配施结合传统耕作是提高陇东半湿润偏旱区冬小麦产量的最佳耕作栽培模式。  相似文献   

Changes in technical efficiency of the broiler production in Poland, 1994–2013     

K. Utnik-Banaś  J. Żmija  J. Krawczyk  K. Połtowicz 《British poultry science》2018,59(2):245-249

1. The effects of changes in technical efficiency on the increase of broiler production are presented for the period 1994–2013 based on the panel data from seven farms located in southern and central Poland. A total of 766 cycles were analysed.

2. The Cobb–Douglas production function was used to assess the changes of output elasticities as well as technical changes in broiler production, for 5-year sub-periods separately.

3. Technical indices of broiler production significantly improved between years 1994–2013: feed conversion ratio decreased from 2.50 kg/kg to 1.78 kg/kg, mortality rate from 8.8% to 4.0% and daily weight gain increased from 37.1 g/d to 58.7 g/d, respectively.

4. Before accession to the EU, there was a substantial increase of fixed capital connected with modernisation of buildings and equipment. In the period 1994–2013, inputs of fixed capital per kilogram of livestock increased by 72% and at the same time the input of labour decreased by 56%.

5. Technical changes in years 1994–1998 contributed to a rapid production increase at a rate of 4.6% annually and only by up to 0.7% annually during 2009–2013. The slowdown of production rate increase after 2009 was partially caused by decreasing the stocking density.  相似文献   

Creation of a predictive equation to estimate fat-free mass and the ratio of fat-free mass to skeletal size using morphometry in lean working farm dogs     

YM Leung  BAS Hodgson 《New Zealand veterinary journal》2018,66(5):248-256

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Effect of feed intake level and dietary protein content on the body temperature of pigs housed under thermo neutral conditions          下载免费PDF全文

A. Morales  N. Ibarra  M. Chávez  T. Gómez  A. Suárez  J. A. Valle  R. L. Camacho  M. Cervantes 《Journal of animal physiology and animal nutrition》2018,102(2):e718-e725

Feed intake and diet composition appear to affect the body temperature of pigs. Two trials were conducted to analyse the effect of feed intake level and dietary protein content on the intestinal temperature (IT) of pigs housed under thermo neutral conditions. Ten pigs (64.1 ± 1.3 kg initial body weight) fitted with an ileal cannula were used. A thermometer set to register the IT at 5‐min intervals was implanted into the ileum through the cannula. In both trials, the ambient temperature ranged from 19.1 to 21.6°C and the pigs were fed at 07:00 and 19:00 hr (same amount each time). In trial 1, the pigs were fed daily 1.2 or 1.8 kg of a wheat–soybean meal diet. The IT followed a similar pattern along a 24‐hr period regardless the feed intake level. The IT rapidly increased up to 0.61 and 0.74°C after the morning meal and up to 0.53 and 0.47°C after the evening meal in pigs fed 1.2 and 1.8 kg/d respectively. The postprandial IT was higher in pigs fed 1.8 kg after each meal (p < .05). In trial 2, pigs were fed daily 1.8 kg of a low (11%) or a high (22%) crude protein diet. The IT followed a similar pattern along the 24‐hr period regardless the dietary protein level. The postprandial IT did not differ between pigs fed the low protein or the high protein (p > .10). The IT rapidly increased up to 0.66 and 0.62°C after the morning meal in pigs fed the high‐ and low‐protein diet (p < .05), but there was no change after the evening meal (p > .10). In conclusion, the feed intake level affected the IT of pigs housed under TN conditions, but the dietary protein content had no effect.  相似文献