共查询到20条相似文献，搜索用时 15 毫秒
1.
选择姜曲海猪瘦肉型品系(零世代)仔猪24头于0,15,30,45,60,75d进行屠宰,取背最长肌做超薄切片,对肌原纤维直径、肌节、A带、I带和H带进行测量分析。结果表明,肌原纤维直径从出生至15日龄期间生长迅速,15日龄时肌原纤维直径比初生时几乎增加了1.5倍,此后各日龄段增长缓慢,到75日龄已接近成熟;肌节长度到45日龄时已达到1649nm,基本分化成熟;A带长度从出生到60日龄呈逐渐增加趋势,60日龄时达到1346nm基本分化成熟;而I带和H带长度不随年龄增长而增加,说明I带和H带长度在胚胎期已基本成熟而稳定;研究发现各部分成熟的先后顺序为:I带(胚胎期)>肌节(45日龄)>A带(60日龄)>肌原纤维直径(75日龄)。 相似文献
2.
LI Lin-ling MENG Jun WANG Jian-wen ZENG Ya-qi YAO Xin-kui REN Hai-fan WANG Huan TUERXUNJIANG&# Wumueraili YAO Fang-fang MAIERDANJIANG MAYILA 《中国畜牧兽医》2016,43(10):2797-2802
Measuring subsection body measurements of Thoroughbred×Yili horses,Orlov trotter×Yili horses,Russia trotter×Yili horses and Hanoverian horse,and calculated the proportion and index,analysing differences in each body measurement,index and proportion.The results showed that the body height,body length,chest circumference,cannon bone circumference,neck length,humerus length,back length,lumbar spine,rump length,rump high,thighbone length and tibiae length of Thoroughbred×Yili horses,Orlov trotter×Yili horses and Russia trotter×Yili horses were extremely significantly lower than Hanoverian horse (P<0.01),the trunk index of Thoroughbred×Yili horse was significantly higher than Orlov trotter×Yili horses (P<0.05),the humerus length/back length,thighbone length/back length and tibiae length/back length of Thoroughbred×Yili horses,Orlov trotter×Yili horses and Russia trotter×Yili horses were extremely significantly lower than Hanoverian horse (P<0.01),all body measurements of Orlov trotter×Yili horses had no significant difference with Russia trotter×Yili horses (P>0.05).The experiment results showed that the difference in body structure of horses for different uses could provide data reference for breeding these horses. 相似文献
3.
Shun HIRASAWA Miki SHIMIZU Yuumi MARUI Miori KISHIMOTO Seiichi OKUNO 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2014,76(12):1603-1607
We designed a new method of
measuring the length of the ulnar nerve and determining standard values for F-wave
parameters of the ulnar nerve in clinically normal beagles. Nerve length must be precisely
measured to determine F-wave latency and conduction velocity. The length of the forelimb
has served as the length of the ulnar nerve for F-wave assessments, but report indicates
that F-wave latency is proportional to the length of the pathway traveled by nerve
impulses. Therefore, we measured the surface distance from a stimulus point to the spinous
process of the first thoracic vertebra (nerve length 1) and the anterior horn of the
scapula (nerve length 2) as landmarks through the olecranon and the shoulder blade
acromion. The correlation coefficients between the shortest F-wave latency and the length
of nerves 1, 2 or the forelimb were 0.61, 0.7 and 0.58. Nerve length 2 generated the
highest value. Furthermore, the anterior horn of the scapula was easily palpated in any
dog regardless of well-fed body. We concluded that nerve length 2 was optimal for
measuring the length of the ulnar nerve. 相似文献
4.
结缕草属植物部分外部性状的遗传分析 总被引：1，自引：0，他引：1
选用2份外部性状存在差异的结缕草(‘J36’)和中华结缕草(Z039)相互杂交,获得正反交F1分离群体,应用植物数量性状主基因+多基因混合遗传模型分析方法对F1群体的密度、草层高度、叶长、叶宽、叶长/叶宽、节间长度、节间直径和节间长度/节间直径进行遗传分析,以初步明确这些性状的遗传特性。结果表明,1) 在调查的8个性状中,正反交杂交后代中每一个性状的变异范围均超出了双亲的变异范围,不同性状变异系数差异较大,密度的变异系数最大,其次为节间长度/直径、节间长度、叶长/叶宽、草层高度、节间直径、叶长和叶宽。2) 草层高度、叶长、叶宽、叶长/叶宽、节间直径和节间长度/直径的正反交后代的表型值存在显著差异,可能有母体遗传效应,密度和节间长度正反交后代间无显著差异。3) 密度的最佳遗传模型正反交均为B-1模型,即2对主基因的加性-显性-上位性遗传模型,正交的主基因遗传率为93.67%,反交的主基因遗传率为63.22%。草层高度、叶长、叶宽、叶长/叶宽和节间长度正反交后代群体的最佳遗传模型均为A-0模型,即无主基因模型。节间直径的正交为1对主基因的遗传模型,反交为无主基因模型,节间长度的正交为无主基因模型,反交为1对主基因模型。 相似文献
5.
本试验通过测定纯血马×伊犁马、奥尔洛夫马×伊犁马、俄罗斯速步马×伊犁马和汉诺威马4个类型马细分体尺,并计算各体尺比例及体尺指数等指标,分析各体尺、体尺指数及各比例差异性。结果表明,在体高、体长、胸围、管围、颈长、肱骨长、背长、腰椎长、尻长、尻高、股骨长和胫骨长等体尺方面,纯血马×伊犁马、奥尔洛夫马×伊犁马、俄罗斯速步马×伊犁马均极显著低于汉诺威马（P<0.01）;体躯指数方面,纯血马×伊犁马显著高于奥尔洛夫马×伊犁马（P<0.05）;肱骨长/背长、股骨长/背长和胫骨长/背长方面,纯血马×伊犁马、奥尔洛夫马×伊犁马、俄罗斯速步马×伊犁马均极显著低于汉诺威马（P<0.01）;奥尔洛夫马×伊犁马和俄罗斯速步马×伊犁马之间所有指标差异均不显著（P>0.05）。本试验结果表明不同用途马匹体型结构具有一定差异性,为不同用途马匹的培育提供数据参考。 相似文献
6.
以三黄鸡为试验材料,分析了个体、家系间羽毛密度、干毛比例、主翼羽长度、尾巴长度的差异,同时对羽毛紧凑度选育方法进行验证研究。结果表明,羽毛密度、干毛比例、主翼羽长度在个体间差异很大,家系间差异达到显著水平。羽毛密度与主翼羽长度、尾巴长度呈显著负相关;干毛比例与主翼羽长度、羽毛密度相关不显著,但与冠高有极显著相关。双向选择效果分析表明,以主翼羽长度和干毛比例为指标进行直接选育效果好,但以羽毛密度为指标进行直接选育效果较差。通过半同胞法估算出羽毛密度、干毛比例、主翼羽长和冠高的遗传力分别为0.198、0.339、0.491、0.549。 相似文献
7.
为了解不同草原生态区域扁穗雀麦(Bromus catharticus Vahl.)的形态变异及其亲缘关系,对17份种质材料的27个形态性状进行测定和分析。结果显示:其形态遗传变异较高,变异系数范围在9.13%～54.76%之间,变异系数较大的性状有小穗数、分蘖数、分枝着生小穗数、叶片长、秆直径、分枝长和株高等;变异系数较小的性状有穗节数、小穗轴节间长、小穗长、外稃长、内稃长、叶舌长、内稃宽、花药长、第二颖脉数、外稃宽等。叶片宽、分枝长、穗长、叶片长、秆直径、株高、小穗含小花数、小花数、小穗宽、花药长、小穗轴节间长等11个指标对总变异的贡献最大。并对27个性状进行了分类和性状间相关性聚类研究,17份材料聚类分析展示了不同材料间的亲缘关系。此形态变异研究为深入研究种质资源及育种提供了科学依据。 相似文献
8.
9.
本研究以银蓝水貂为材料,对6个世代的1686只水貂的生长记录进行统计分析,分析性别及年份对水貂体重、体长、针毛长、绒毛长和针、绒毛长比率的表型趋势影响。利用多性动物模型约束最大似然法（REML）估计以上水貂生产性状的遗传力和遗传相关。在模型中考虑了年份和性别固定效应,随机效应为个体的加性效应。结果表明,各性状遗传力均较高,其中体重为0.41,体长为0.53,针毛长为0.53,绒毛长为0.52,针、绒毛长比率为0.52。除针、绒毛长比率与其他性状间呈表型负相关（-0.218、-0.178、-0.074、-0.425）外,各性状间均为表型正相关（分别为0.289、0.882、0.869、0.806、0.788、0.930）。体长与绒毛长、针、绒毛长比率呈现遗传负相关（-0.941、-0.983）,其他均为较强的遗传正相关,分别为0.983、0.731、0.972、0.981、0.622、0.992、0.641、0.987。 相似文献
10.
体尺细分法在竞赛用伊犁马选择上的应用研究 总被引：3，自引：0，他引：3
本文采用体尺细分法 ,测定了乌鲁木齐马术俱乐部 2 4匹伊犁马 1 9个细分体尺及 1 0 0 0m速度成绩。分析细分体尺与速度的相关性 ,结果为 :颈长、肩长、肱骨长、股骨长、胫骨长、肩倾角、股骨倾角、髋骨倾角与速度呈显著 (P <0 0 5)或极显著 (P <0 0 1 )相关 相似文献
11.
G B Smyth 《Equine veterinary journal》1988,20(2):104-108
Lengths of small intestine, caecum, ascending colon and descending colon were measured in intestinal tracts from 103 foetuses, foals and adult horses. Intestinal tracts from 21 of the horses were measured at varying intervals after death. Total intestinal length increased markedly from mid-gestation to one year of age, then showed little increment up to 35 years. Small intestinal length increased most rapidly in the first month of life. Caecal length increased most rapidly from one to six months and length of ascending colon increased most rapidly between one week and one year. Descending colon length increased gradually after birth. Periods of rapid increase in length of various intestinal segments and alterations in the percentage of total intestinal length were associated with periods of rapid body growth and changes in dietary composition. Sex and post mortem interval did not affect intestinal length significantly. 相似文献
12.
【目的】分析胎次、配种季节和与配公猪3个固定效应对大白母猪妊娠天数的影响,估计妊娠天数的遗传参数并探索其与总产仔数、产活仔数、初生窝重、死胎数、木乃伊数的关系。【方法】收集2 138头大白母猪妊娠天数、总产仔数、产活仔数、初生窝重、死胎数及木乃伊数6种生产表型,共包含4个胎次(1～4)的4 261条记录。利用一般线性模型分析试验猪群的固定效应对妊娠天数的影响,并采用多性状重复力模型估计妊娠天数与其他繁殖性状的遗传参数(遗传力、重复力、遗传相关、表型相关)。【结果】大白母猪平均妊娠天数为116.08 d,经t检验分析与114 d差异显著(P<0.05)。胎次对妊娠天数有显著影响,且第1胎妊娠期显著短于第2胎(P<0.05);配种季节对妊娠天数有极显著影响(P<0.01),春季配种的母猪妊娠天数最短,秋季配种的母猪妊娠天数最长,相差0.73 d(P<0.05);与不同公猪个体配种后母猪的妊娠天数之间有显著差异(P<0.05),差异最大达3.05 d。妊娠天数遗传力为0.1603,与总产仔数、产活仔数、初生窝重、死胎数及木乃伊数之间均呈现负表型和负遗传相关。【结... 相似文献
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14.
试验旨在研究青年伊犁马不同运动性能间步幅指数与步频指数的差异,并探究其与运动性能的关联性,以期提高伊犁马个体选择和性能测定的科学性和准确性。试验以参加伊犁马常态化赛事的72匹2岁伊犁马为研究对象,测量其体尺与步态特征,计算其各项步幅指数与步频指数,分析不同途程、不同运动性能间的差异,并对各指标与竞赛用时做偏相关分析,探究各指标与运动性能的关联性。结果表明,伊犁马1 600 m竞赛中,精英组体高步频指数、体长步频指数均极显著高于普通组（P<0.01）,且与竞赛用时呈极显著负相关（P<0.01）,精英组体高双支撑相步幅指数、体长双支撑相步幅指数、体高步幅指数、体长步幅指数均极显著高于普通组（P<0.01）,并与竞赛用时呈极显著负相关（P<0.01）;3 600 m竞赛中,精英组体高步频指数、体长步频指数极显著高于普通组（P<0.01）,体长步频指数与竞赛用时呈极显著负相关（P<0.01）,精英组体高双支撑相步幅指数,体长双支撑相步幅指数均显著高于普通组（P<0.05）,且与竞赛用时呈显著负相关（P<0.05）。体高步频指数与体长步频指数可作为青年伊犁马的首选性能评估和选择指标,可广泛用于青年伊犁马育种和训练实践中,以提高性能评估效率。 相似文献
15.
为了分析金湖乌凤鸡体重与体尺的相关性,选取120日龄公母鸡各100羽进行测定和分析,结果表明:公鸡的体重、体斜长、龙骨长、胸宽、胸深、胫长、胫围指标极显著大于母鸡(P＜0.01),公鸡的胸角极显著小于母鸡(P＜0.01).公鸡的体重、胸宽、胸深及母鸡体重、胸宽变异系数均大于10％,体尺其他性状指标均小于10％.公鸡体重... 相似文献
16.
The purpose of this study was to examine the factors affecting gestation length in 209 foalings from 65 heavy draft horses by multiple linear regression analysis. The objective variable was gestation length, and the explanatory variables were stud farm, year foaled, month foaled, age of mare, parity of mare, last gestation length, foal gender, and some meteorological parameters (the mean values of prepartum 10 days: maximum temperature, minimum temperature, average barometric pressure, and hours of sunshine in a day). The mean gestation length for 209 foalings was 334.9 (standard deviation = 8.3) days, with a range of 313-352 days. Stepwise regression analysis showed that last gestation length and foal gender had significant (P < .01) effects on gestation length. Multiple regression analysis showed that last gestation length (standard partial regression coefficient = 0.54) was more influential on the present gestation length than foal gender (standard partial regression coefficient = 0.22). The present gestation length and the last gestation length were moderately positively correlated (r = 0.56, P < .01). Colt foal (n = 106) pregnancies were significantly (P < .01) longer than fillies (n = 103) (mean ± SEM: colt 337.1 ± 0.7 vs. filly 332.7 ± 0.9). According to our results, last gestation length (mare itself) and foal gender were the main factors affecting gestation length in heavy draft horses. Once several gestation lengths are known, predictions with acceptable accuracy can be made about the gestation length of that mare's following foaling. 相似文献
17.
本研究对30只94日龄中畜小型白羽肉鸭(CMD)在大群地面散养方式下的屠宰性能和体尺指标进行了测定,并对测定结果进行了相关分析,结果发现活重与体斜长、龙骨长、胸宽、胫围、半潜水长等体尺指标的相关系数分别达到0.588、0.660、0.618、0.654、0.582,均达到极显著水平(P<0.01);全净膛重与体斜长、龙骨长、胫围、半潜水长等体尺指标的相关系数分别达到0.476、0.566、0.552、0.455,均达到显著(P<0.05)或极显著水平(P<0.01)。此外,研究分别建立了活重与体斜长、龙骨长、胸宽、胫围、半潜水长以及全净膛重与体斜长、龙骨长、胫围、半潜水长的回归模型,两个回归模型经F检验均达到显著水平(P<0.05)。 相似文献
18.
结缕草属植物生殖性状的遗传分析 总被引：1，自引：0，他引：1
选用2份生殖性状存在差异的结缕草(Z136)和中华结缕草(Z039)相互杂交,获得正反交F1分离群体,应用植物数量性状主基因+多基因混合遗传模型分析方法对F1群体的花序密度、生殖枝高度、花序长度、每穗小穗数、小穗长度、小穗宽度、小穗长度/宽度进行遗传分析,以初步明确这些性状的遗传特性。结果表明,1)在调查的7个性状中,正反交杂交后代中每一个性状的变异范围均超出了双亲的变异范围,不同性状的变异系数差异较大,花序密度的变异系数最大,其次为生殖枝高度和每穗粒数,小穗长度和宽度的变异最小,花序长度的变异居中。2)花序密度、生殖枝高度、小穗长度和小穗长/宽正反交后代的观测值存在显著差异,可能有母体遗传效应,花序长度、每穗粒数和小穗宽度正反交后代间的观测值无显著差异。3)花序密度正反交后代群体的最佳遗传模型为存在2对主基因控制的遗传模型,生殖枝高度、花序长度和小穗宽度正反交后代群体的最佳遗传模型均为A-0模型,即无主基因模型。每穗粒数正交为1对主基因的遗传模型,反交为无主基因模型,小穗长度的正交为无主基因模型,反交为1对主基因模型。小穗长/宽正交的最适遗传模型为B-1模型,即2对主基因的加性-显性-上位性遗传模型,主基因遗传率为42.72%,反交群体的最适遗传模型为B-2模型,即2对主基因的加性-显性遗传模型,主基因遗传率为98.81%。 相似文献
19.
The relationship between pedicle flap width and viable length was characterised for skin flaps of the flank in ponies. Four dorsally based, pedicle type skin flaps of 20 cm in length and 3, 6, 9 or 12 cm in width were created in a random sequence on one flank in each of 10 ponies. Flap survival length was assessed by skin texture and appearance, depilation of hair and wound healing at 14 days after surgery. There was considerable variation between animals in the viable length of flaps of the same width; however, a significant difference in the viable length of flaps of different widths was detected (P = 0.002). The viable length of the 3 cm flaps was significantly different from that of the 12 cm flaps (9.69 +/- 1.1 cm vs 12.97 +/- 1.0 cm, mean +/- se P less than 0.05). There was a positive correlation between flap width and viable length (r2 = 0.141, P = 0.017). There was no effect of flap order (cranial to caudal positioning relative to the other flaps) on viable length (P = 0.286). The results of this study demonstrate a significant relationship between flap width and viable length, confirming a previously unsupported assumption that flap width and viable length are related. These findings suggest that the clinician should employ broad pedicles when using local flaps to reconstruct skin defects on the flank of the horse. 相似文献
20.
本试验以二郎山山地鸡为研究对象,分析其2个品系鸡距的生长发育规律,希望能将其鸡距的长度作为区分两品系的标志之一。本试验从23周龄开始,每个品系测定100只公鸡的距长,每周测1次(第1阶段),结果发现,同一品系中4次测定结果均差异不显著(P0.05);从27周龄开始,改为每个月测1次(第2阶段),结果表明:2个品系的距长发育整齐度并不是很高,距长与个体发育有关,与生长时间不呈绝对正比,且与体重不相关(R0.3);SD03系公鸡的距明显长于SD02系(P0.05)。试验结果表明,可以将距长作为区分2个品系的标志之一,但在实际生产中该方法对饲养时间较短的商品肉鸡不可行。 相似文献