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《贵州畜牧兽医》2021,45(5)
为了研究北盘江流域外来鱼种尼罗罗非鱼的年龄与生长特征,对北盘江光照库区月亮田新码头、蕫箐库区与马马崖库区、龙滩库区白层码头的尼罗罗非鱼356尾(成功鉴定310尾)进行鱼龄、体长、体重测定,并分析鱼鳞年轮特征及体长与鳞径、体长与体重的关系。结果:北盘江尼罗罗非鱼鳞片年轮为疏密型,规律性强,环纹清晰易辨,轮径测量方便,鉴定效果较好;体长与体重关系为:W=8×10~(-5)L~(2.862 7)(r~2=0.986 8,n=310);体长与鳞径关系线性函数拟合度最高,表达式为L=52.54R+37.877;体长、体重的Von Bertalanfy生长方程分别为:L_t=548.83~([1-e-0.192(t+0.988)]),W_t=5 562.61~([1-e-0.192(t+0.988)]2.862 7);1～3年龄鱼的体长、体重相对增长率明显大于此后各龄鱼,在2年龄阶段体长生长优势更为明显,4年龄以后体重增长减缓。 相似文献
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许新 《养殖与饲料．饲料世界》2018,(3)
本文主要阐述光倒刺鲃开发利用价值、光倒刺鲃种质资源的基本特性和影响光倒刺鲃种质资源的主要因素,并提出限制渔船数量及渔具、渔法,实行限额捕捞,构建人工增殖放流点,深化光倒刺鲃的人工驯养等种质资源保护措施,从而促进光倒刺鲃的繁殖及生长。 相似文献
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青海湖裸鲤年龄与生长的研究 总被引：5，自引：0，他引：5
报道了青海湖裸鲤的年龄生长特点。以鳞片上的年轮作为年龄鉴定依据。体长与鳞长之间呈直线正相关L=104.6+2.1s(r=0.934 2),体重与体长呈指数函数相关W=1.5×10~(-5) L~(2.9784),其生长规律适合Von Bertalanffy方程:Lt=885〔1-e~(-0.04(t+1.4)〕,Wt=9201.9〔1-e~(-004(t+1.4)〕~3.研究结果表明:青海湖裸鲤一生中生长无明显阶段性。 相似文献
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水库网箱养殖光倒刺鲃技术 总被引：6，自引：0，他引：6
2009年,光倒刺鲃在安徽省宁国市被驯化为山塘水库网箱养殖对象。利用水库网箱养殖光倒刺鲃可提高水库水体生产效率,实现高密度、集约化养殖。就其养殖技术作一简单介绍,以供参考。 相似文献
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《饲料工业》2019,(24):45-51
为探讨长期投喂肉质改良剂对大鳞鲃生长、肌肉结构及抗氧化力的影响,选取初始体重为(311.32±2.54)g,初始体长(35.79±2.33)cm健康大鳞鲃成鱼240尾,随机分为4组(每组3个重复,每个重复20尾鱼),分别投喂添加0、6.5%、10.5%和14.5%肉质改良剂的等氮等能饲料,依次标记为Y1～Y4组,其中Y1组为对照组。饲养75 d后测定大鳞鲃生长指标,各组织(鳃、脑、肝胰脏、中肾、脾脏)及血清中超氧化物歧化酶(SOD)、过氧化氢酶(CAT)和丙二醛(MDA),背部生肌肉肌纤维直径和质构特性。结果显示:Y2、Y3组大鳞鲃增重率、蛋白质效率显著提高,其中Y3组达到最大值,Y2组次之(P<0.05);背部生肌肉硬度和咀嚼度最大值均出现在Y3组,Y4组次之,分别比Y1组提高了37.52%、24.82%、51.6%和39.7%(P<0.05);胶着度最大值出现在Y3组(P<0.05),比Y1组提高25.59%;各试验组肌纤维直径均有不同程度的降低,其中Y3组直径最小,比Y1组降低29.65%(P<0.05);肉质改良剂能提高大鳞鲃抗氧化能力,其中Y3组SOD、CAT活性相对高,而MDA含量下降也最为明显。总之,肉质改良剂可效提高大鳞鲃生长和抗氧化能力,改善肌肉结构。建议大鳞鲃饲料中肉质改良剂添加水平为10.5%。 相似文献
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为了解黑脊倒刺鲃在贵州喀斯特山区人工养殖条件下的营养特点,分析了贵州喀斯特山区人工养殖条件下黑脊倒刺鲃肌肉的营养成分。结果表明：黑脊倒刺鲃肌肉鲜样中粗蛋白、粗脂肪、粗灰分、水分的含量分别为18.25%、1.83%、2.67%、77.25%;检测出氨基酸18种,占干重的75.07%,呈味氨基酸占干重的27.82%,∑EAA/∑TAA和∑EAA/∑NEAA分别为40.68%、68.58%;检测出脂肪酸27种,饱和脂肪酸（SFA）占脂肪酸总量的24.18%,单不饱和脂肪酸（MUFA）占脂肪酸总量的53.31%,多不饱和脂肪酸（PUFA）占脂肪酸总量的22.51%。试验结果表明,黑脊倒刺鲃是一种营养价值较高的优质鱼类。 相似文献
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中华倒刺鱼巴生物学特性的研究 总被引：7，自引：0，他引：7
为了研究积累中华倒刺鱼巴生物学特性的相关资料 ,为其野生资源的合理利用提供理论依据 ,收集该样本 94尾进行生物学特性的研究。结果表明 ,其染色体数为 (2n =10 0 ) ,核型公式为 18m +32sm +2 6st+2 4t,臂数 (NF =15 0 )。 1～ 4龄是生长较快的生长阶段。属广温性底栖鱼类 ,适应温度为 0～ 36℃ ,最适摄食生长温度 2 2～ 2 8℃。杂食性 ,以高等植物、藻类、水生昆虫、软体动物等为食。性成熟年龄 4龄以上 ,绝对怀卵量每克体重为 12～ 14粒 ,成熟卵直径 1 3～ 1 6mm ,略具黏性 ,受精卵的出膜时间为 38～ 4 8h。产卵季节为每年的4～ 6月份 ,产卵水温 19～ 2 8℃。 相似文献
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刺鲃鱼卵营养成分分析及评价 总被引：3，自引：0，他引：3
为了对刺鲃(Spinibarbus caldwelli)鱼卵的营养品质进行评价,本试验采用常规方法对刺鲃鱼卵的一般营养成分含量、氨基酸组成、脂肪酸组成和微量元素含量进行了测定。结果表明:刺鲃鱼卵(鲜样)中粗蛋白质含量为27.66%、粗脂肪含量为3.18%、水分含量为64.26%、粗灰分含量为3.09%。刺鲃鱼卵共检测出17种氨基酸,其中必需氨基酸(EAA)7种,非必需氨基酸(NEAA)10种,总氨基酸(TAA)含量为23.21%,EAA含量为9.28%,NEAA含量为13.93%;EAA构成比例符合FAO/W HO标准,分别以氨基酸评分(AAS)和化学评分(CS)进行评价,其第一限制性氨基酸均为蛋氨酸+半胱氨酸,第二限制性氨基酸均为苯丙氨酸+酪氨酸。必需氨基酸指数(EAAI)为59.26%。刺鲃鱼卵共检测出11种脂肪酸,其中3种饱和脂肪酸(SFA)、3种单不饱和脂肪酸(MUFA)、5种多不饱和脂肪(PUFA),分别占脂肪酸总量的22.68%、48.40%、28.93%;C20∶5n-3(EPA)+C22∶6n-3(DHA)占脂肪酸总量的8.53%。刺鲃鱼卵中微量元素铜、锌、铁、锰、硒含量丰富,其中锌、铁含量分别高达90.986 5、31.386 3 mg/kg。由此得出,刺鲃鱼卵营养丰富,有较高的综合开发利用价值。 相似文献
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Techniques for the age determination of highveld eland in Natal were investigated. Tooth eruption and replacement sequence, and growth in horn length, were suitable criteria for the age determination of young eland with deciduous dentition. The most accurate technique for the age determination of post mortem adult eland was based on counts of cementum annuli from molar teeth. Animals without distinctive cementum annuli may be assigned ages from measurements of M3 crown height. The ages of live restrained eland could be derived from measurements of I1 occlusal width or I1, crown height. Horn morphology was adequate for age and sex classification of free-ranging eland up to adult status. 相似文献
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F. Witzmann B. M. Rothschild O. Hampe G. Sobral Y. M. Gubin P. Asbach 《Anatomia, histologia, embryologia》2014,43(2):90-102
Temnospondyls, the largest group of Palaeozoic and Mesozoic amphibians, primitively possess rhachitomous vertebrae with multipartite centra (consisting of one horse‐shoe‐shaped inter‐ and paired pleurocentra). In a group of temnospondyls, the stereospondyls, the intercentra became pronounced and disc‐like, whereas the pleurocentra were reduced. We report the presence of congenital vertebral malformations (hemi, wedge and block vertebrae) in Permian and Triassic temnospondyls, showing that defects of formation and segmentation in the tetrapod vertebral column represent a fundamental failure of somitogenesis that can be followed throughout tetrapod evolution. This is irrespective of the type of affected vertebra, that is, rhachitomous or stereospondylous, and all components of the vertebra can be involved (intercentrum, pleurocentrum and neural arch), either together or independently on their own. This is the oldest known occurrence of wedge vertebra and congenital block vertebra described in fossil tetrapods. The frequency of vertebral congenital malformations in amphibians appears unchanged from the Holocene. 相似文献
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Diets with graded levels of the experimental microbial phytase SP1002 (0, 500, 1000, 2000 and 4000 FTU/kg) were fed to juvenile Nile tilapia (average BW = 68.8 g) for 60 days (n = 4). A digestibility trial ran parallel to the growth trial using 0.3 g TiO2/100 g as an indigestible marker. The efficiency of phytase supplementation was evaluated by parameters of growth response, crude protein and mineral utilization (using body composition data), apparent nutrient digestibility, mineral content in scale and vertebra and inorganic phosphorus in blood plasma. Data were submitted to ANOVA and Tukey-test using SAS-program. Significant improvements (p < 0.01) were found for growth, FCR and SGR, mainly for diets with 1000 and 2000 FTU/kg phytase supplementation. Protein utilization was significantly increased and maximized between 1000 and 2000 FTU/kg. Phosphorus utilization increased significantly up to 4000 FTU/kg. Digestibility of protein and phosphorus was also significantly improved. Phosphorus concentration in the blood, vertebra and scale increased significantly after phytase addition. Similarly, calcium and magnesium concentration in vertebra and scale were increased. Generally, phytase supplementation between 1000 and 2000 FTU/kg resulted in growth rates and mineralization parameters similar to a control diet with inorganic phosphorus. 相似文献
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小肠是猪的主要消化吸收器官,对个体的生长发育非常重要,但到目前为止,国内外对猪小肠的研究还很少。为探讨其长度与生长发育性状之间的关系,本试验测定了白色杜洛克×二花脸资源家系F2和F3群体共计1 508头个体的240日龄小肠长度、出生重、21日龄体重、46日龄体重、0~46日龄平均日增重、46~240日龄平均日增重、240日龄平均日增重、240日龄宰前活重及屠宰后胴体直长、胴体斜长等10项生长性状指标,并对其与小肠长度的相关性进行了分析。结果显示猪240日龄小肠长度与这些生长性状都存在极显著相关(P0.001),表明小肠可能通过影响个体对营养成分的消化吸收而影响个体的生长发育。据我们所知,本试验是首次在大规模样本群体中研究猪小肠长度与生长发育性状的相关性,其结果为小肠和个体发育研究提供了重要参考。 相似文献
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ELIZABETH A. BAINES JOHN GRANDAGE MICHAEL E. HERRTAGE STEPHEN J. BAINES 《Veterinary radiology & ultrasound》2009,50(1):69-73
The anticlinal vertebra is a point in the caudal thoracic vertebral column at which vertebral anatomic features change. It may be used as a point of reference in diagnostic imaging studies. However, its exact definition and anatomic location are not consistent between anatomic texts. The position of the anticlinal vertebra was evaluated radiographically in 100 dogs, using three different definitions of the anticlinal vertebra. Definition P referred to perpendicularity of the spinous proceses, definition V referred to verticality of the spinous processes, and definition J referred to the orientation of the intervertebral joints. The anticlinal vertebra was assessed to be T11 in 85%, 75%, and 89% of dogs for definitions P, V, and J, respectively. Combining definitions improved the likelihood that the vertebra assessed to be the anticlinal vertebra was T11, if the combination included definition J, but at the expense of loss of sensitivity. The degree of agreement between the definitions ranged from fair to poor. The level of agreement between definitions P and J was improved for small and large dogs and the level of agreement between definitions V and J was improved for medium and large dogs. Compared with large breed dogs, small breed dogs were more likely to have T10 described as the anticlinal vertebra. The presence of transitional vertebra did not affect the position of the anticlinal vertebra. It should not be assumed that the anticlinal vertebra is T11 in all dogs. Care should be taken to define this anatomic feature accurately when using it as an anatomic landmark. 相似文献
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对珠三角三个曾发生萎缩性鼻炎,现已临床控制两年以上的大型猪场的健康母猪、乳猪和保育猪鼻腔取样81份,分离支气管败血波氏杆菌,结果21份阳性;对珠三角地区16个猪场送检病猪,取有炎症病变的肺184份,分离波氏杆菌,结果13份阳性。 相似文献