共查询到19条相似文献,搜索用时 203 毫秒
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为了解黄颡鱼二倍体和三倍体的形态特征区别,分别选取性成熟的黄颡鱼二、三倍体雌雄个体,测量鱼体形态各指标并进行比较研究。结果:雌性的体长/尾柄长、头长/尾柄长、头长/眼后头长之比均无显著差异(P0. 05),而体长/体高、体长/头长、体长/眼径、头长/眼径、体高/体厚有显著差异(P0.05);雄性的体长/体高、体长/头长、体长/尾柄长、体长/眼径、头长/眼径、头长/尾柄长、头长/眼后头长均无显著差异(P0.05),而体高/体厚的有显著差异(P0.05)。结果表明:可通过体高/体厚的比值快速鉴别雄性或雌性二、三倍体黄颡鱼,在体高相同的情况下三倍体比二倍体的体厚较薄。 相似文献
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诱导蟾蜍排卵及蝌蚪生长发育规律的试验研究 总被引:1,自引:0,他引:1
研究了蟾蜍受精卵的孵化过程 ,对蝌蚪的生长、发育、变态及幼蛙的生长特性等方面进行了观察和测量 ,同时 ,采用人工诱导排卵的方法 ,进行了蟾蜍在人工条件下的受精试验 ,并对人工诱导的蟾蜍卵细胞进行了孵化试验。结果表明 ,自然条件和人工诱导条件均能够完成蝌蚪的孵化和发育 ,但是在蝌蚪的变态阶段存在较高的死亡率。 相似文献
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对麦盖提羊初生、断奶和周岁公母羊体重与体高、体长、胸围、胸宽、胸深、耳长、尾长等指标的相关性进行了分析,结果表明,麦盖提羊初生重与体高、胸围和耳长有正强相关关系,差异极显著(P<0.01);断奶公母羔体重与胸围、尾长、体长、尾厚、管围有正强相关关系,差异极显著(P<0.01);周岁羊的体重与胸围、管围有正强相关关系,差异极显著(P<0.01). 相似文献
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不同饲料对黑眶蟾蜍蝌蚪生长的影响 总被引:6,自引:1,他引:5
以藻类、蛋黄、杂鱼内脏、牛蛙蝌蚪饲料和鳗鱼饲料等 5种不同类型的饲料以及用鳗鱼饲料为基底 ,按 10 0 %、90 %、80 %、70 %、6 0 %、4 0 %和 2 0 %等 7种比例添加可溶性淀粉 (分析纯 )配制成不同营养结构的饲料为基本日粮饲喂黑眶蟾蜍蝌蚪 ,研究了这些饲料对黑眶蟾蜍蝌蚪生长发育的影响。结果表明 ,以牛蛙蝌蚪饲料和鳗鱼饲料等蛋白质含量较高的配合饲料为食的黑眶蟾蜍蝌蚪 ,生长速度快 ,进入变态期的时间短 ;并表明了粗蛋白质含量为 2 0 %左右的配合饲料饲喂黑眶蟾蜍蝌蚪可以取得较为理想的效果 相似文献
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麦盖提羊体重与体尺指标及其相关性分析 总被引:1,自引:0,他引:1
对麦盖提羊初生、断奶和周岁公母羊体重与体高、体长、胸围、胸宽、胸深、阼长、尾长等指标的相关性进行了分析,结果表明,麦盖提羊初生重与体高、胸围和耳长有正强相关关系,显著(P<0.01);断奶公母羔体重与胸围、尾长、体长、尾厚、管围有正强相关关系,差异极显著(P<0.01);周岁羊的体重与胸围、管围有正强相关关系,差异极显著(P<0.01)。 相似文献
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鲢鱼﹑鲤鱼均属鲤科鱼类,鲢鱼属于长纺锤形体型,鲤鱼为典型的纺锤形体形。这两种鱼都是我国的主要经济鱼类,分布地域广,市场所占比例较大。目前,鉴定鱼类的分类学主要依据形态方面的特征,为了更好的区分二者之间的主要生物学特征,本次试验分别测量鲢鱼和鲤鱼的体长﹑体高﹑头长﹑吻长,计算体长与体高,体长与头长及头长与吻长的比值,并作统计分析。试验结果表明鲢鱼与鲤鱼体长/体高差异极显著,体长/头长差异显著,头长/吻长差异极显著。此试验对于研究鱼类形态学的变化及选育优质鱼种具有一定的作用;而且也可以为选择同类鱼提供参照。 相似文献
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利用经分类鉴定并保存于固定培养基中的AH9804嗜水气单胞菌株对黑斑蛙和花背蟾蜍进行动物接种感染试验(腹腔接种剂量2mL、含菌数144×108个),结果显示,该菌对上述2种动物具有明显的致病作用。同时,使用所制备高免血清作了同种动物免疫保护试验(血清抗体效价1280、肌肉接种剂量30mL),对其结果进行了验证。 相似文献
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Yuko Tajima Akinori Shimada Tadasu K Yamada Daniel F Cowan 《Journal of zoo and wildlife medicine》2007,38(1):108-113
Amyloidosis is a disease characterized by the tissue deposition of autologous extracellular fibrillar proteins that can result in compression of adjacent tissues. Amyloidosis is well-recognized in a wide variety of animals, including mammals, birds, and reptiles. However, to date, there is only one report of amyloidosis in cetaceans. During 1999 and 2000, among 12 Stejneger's beaked whales (Mesoplodon stejnegeri) that were stranded along the Sea of Japan's coast, amyloidosis was found in two whales (case 1, 498 cm, male; case 2, 520 cm, female). For this study population, the prevalence rate of amyloidosis was approximately 17%. These two animals were considered physically and sexually mature based on body length, external features, gonad characteristics, and skeletal features. Livers were notably swollen, fragile, and pale (brownish yellow) on gross examination. A large deposit of amyloid was found in Disse's spaces along with marked atrophy of the hepatocytes. Numerous granulomas, including many nematodes (Crassicauda sp.), were found along with amyloid deposition in the kidneys. Amyloid was also detected in the heart, spleen, adrenal gland, and pancreas. Amyloid in both cases was identified by typical morphology on H&E and Congo red staining. Electron microscopy displayed a typical network of fine fibrils measuring about 11 nm in diameter. This is the first report of amyloidosis in two Stejneger's beaked whales stranded on the coast of the Sea of Japan. 相似文献
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为研究日粮不同精粗比对思南杂交肉牛体尺性状与血液生化指标的影响,试验选择体重相近的12头思南杂交肉牛随机分为A、B、C、D共4个组,每组3个重复,每个重复1头牛,A、B、C、D组精粗比分别为3:7、4:6、5:5、6:4。结果表明:(1)提高思南杂交肉牛日粮精粗比可以促进体高、体斜长、胸围和管围的增长,并且各组后60天各项体尺性状指标增长的平均值高于前60天,除管围外其余各指标总增长以精粗比5:5时最高|(2)试验结束时,D组红细胞数量较A组高18.28%(P < 0.05),较B组高13.61%,较C组高7.2%(P > 0.05),血红蛋白含量高于正常范围,其余血常规指标各组之间差异均不显著。综上,思南杂交肉牛肥育前期精粗比以5:5为宜,后期可根据体尺发育情况提高精粗比至6:4,适宜的精粗比会促进红细胞和血红蛋白含量的增加,满足机体组织细胞代谢的需要,发挥肉牛的增重潜力。
[关键词] 精粗比|杂交肉牛|体尺性状指标|血液常规指标 相似文献
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Scott Willens Sloan H Dupree Michael K Stoskopf Gregory A Lewbart 《Journal of zoo and wildlife medicine》2006,37(2):97-101
Color Doppler ultrasonography was used to determine time-average mean velocity and cross-sectional area of the common iliac artery in bullfrogs (Rana catesbeiana) and marine toads (Bufo marinus). Volumetric blood flow and weight-adjusted blood flow measurements were calculated from this data. Volumetric flow rates of frogs (31.8 ml/min) and toads (23.6 ml/min) did not differ statistically. However, when flow rates were adjusted for body mass, toads displayed a significantly greater flow rate of 238.1 ml/min/kg compared to 114.4 ml/min/kg for frogs. 相似文献
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南阳,皮埃蒙特及其杂交牛的血液生化遗传标记与生长性状关系 总被引:5,自引:0,他引:5
利用水平淀粉凝胶的方法测定了143头南阳黄牛,皮埃蒙犊牛(Piemontese)及二者杂交后代的血红蛋白(Hb),白蛋白(Alb)淀粉酶和碳酸酐酶的多态性,并对全部个体进行了线性体型评分和体尺测定。运用最小二乘法拟合线性模型对各标记基因型的效应及不同标记基因型间生长性状指标差异显著性进行检验。 相似文献
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鲁西黄牛GH基因3′末端序列多态性及其与生产性状的关联分析 总被引:1,自引:0,他引:1
本研究检测了鲁西黄牛GH基因3′末端序列的多态性,并分析了其与生产性状的相关性。结果发现,由于2639 bp处碱基C→G的突变造成HaeⅢ内切酶增加了一个酶切位点,该位点检测到AA、AB、BB 3种基因型。利用最小二乘拟合线性模型对GH基因多态位点不同基因型与生产性状指标进行显著性检验,结果发现,GH位点上AB基因型的体重、体高、体斜长、胸围和肉用指数显著高于AA、BB基因型(P0.05);BB基因型的个体体重、体高、体斜长、胸围和肉用指数略高于AA基因型,但差异不显著(P0.05)。因此,等位基因B可初步确定为影响牛体重、体高、体斜长、胸围和肉用指数的优势基因。 相似文献
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柴达木绒山羊主要数量性状表型相关分析 总被引:1,自引:0,他引:1
对柴达山绒山羊母羊的绒层厚度、粗毛长度、产绒量、体重、体长、体高、胸围、管围、体侧部绒纤维伸直长度和绒纤维细度进行了表型相关的测算,结果表明:(1)对育成母羊产绒量影响较大的三个性状按决定系数大小依次为体长、绒层厚度和体侧部绒纤维伸直长度,呈现正向影响;绒层厚度还与体长和绒纤维细度协同产生对产绒量的正向影响;体重和体高对产绒量有较小的负向影响。(2)对成年母羊产绒量影响较大的性状按决定系数大小依次为绒层厚度、体重、粗毛长度、体高、胸围和绒纤维伸直长度,其中粗毛长度和体高呈现负向影响,其余性状为正向影响。 相似文献
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Age and growth rate are critical parameters determining the body size of adult anurans, which grow indeterminately. Therefore, evaluating their relative importance and selective pressures acting on them may help to explain variation in body size of anurans across geographical populations. Based on the data on body size and skeletochronological age of 4 Asiatic toad (Bufo gargarizans) populations that are widely separated in latitude, the present study showed that toads at the northern extremity of the range were the oldest, on average, and grew relatively fast, toads at the southern end of the range were relatively old but grew fastest, whereas mid‐latitude toads were intermediate in both traits. These results indicated that relative contributions of age and growth rate to body size differed among populations. From a life history perspective, greater age attained by toads at higher latitudes should result from delayed maturation, and faster growth from an adaptive response to strong seasonal time constraints; in contrast, selective pressures on the 2 parameters at lower latitudes might be associated, respectively, with low adult death rates and longer favorable growing seasons. 相似文献