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双季青虾养殖,是根据青虾生长规律,充分利用水面资源,一年养殖两茬青虾的生产技术。前茬青虾平均每0.067公顷单产达40公斤,后茬青虾平均单产50公斤以上,从而实现较高的经济效益。 (一)池塘准备 池塘面积0.33~0.8公顷,水深1.0~1.2米,砂土或壤土均可,坡比1:2~1:3,池塘不渗水,池底淤泥控 相似文献
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冬闲稻田 养虾技术 总被引:1,自引:0,他引:1
杨保国 《兽药与饲料添加剂》2009,14(6):39-40
冬闲稻田养青虾,即头年11月底放养当年达不到上市规格的青虾,到次年5月底收获商品虾,一般每667m2水域产商品青虾25~30kg,增加效益600~800元。现将其主要技术要点介绍如下: 相似文献
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二、早稻田养青虾
早稻田养殖青虾,既可改善稻田生态环境,又可增产增收,是一项很有发展前途的养殖模式.只要坚持因地制宜,严格按照技术规范操作,切实加强饲养管理,早稻田养青虾,在保持稻谷稳产的同时,还能获得亩产20~30公斤的青虾产量,取得比较好的经济效益. 相似文献
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青虾,学名日本沼虾,又称河虾,动物分类上属节肢动物门,甲壳纲,十足目的长臂虾科。青虾是名特水产品,肉味鲜美,营养丰富,市场行情好,且养殖技术简单,是深受养殖户欢迎的养殖品种。近年来,随着对青虾生长特性、营养需求及颗粒饲料研究的深入,利用颗粒饲料饲养青虾技术已发展成为一项“低投入,高产出”的高效养殖模式,并取得了很好的示范推广效果。1池塘条件1.1池塘的选择青虾对水质要求较高,养殖青虾水源应取自水质清新,无污染的水域;池塘大小,根据养殖者的管理水平及养殖规模来确定,单个池塘以0.2ha~0.4ha… 相似文献
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Valorie S. Mackey DVM Donald R. Trout DVM‡ Dennis M. Meagher DVM PhD† William J. Hornof DVM MS‡ 《Veterinary radiology & ultrasound》1987,28(1):26-31
The medical records, radiographic and nuclear scintigraphic findings of 26 racing horses with 27 stress fracture episodes of the humerus, radius, or tibia were reviewed. The purposes of this study were to describe the radiographic and/or scintigraphic features of stress fractures of the humerus, radius, or tibia, and to evaluate the signalment and history of horses in which stress fracture occurred. Stress fractures of the three long bones examined were primarily seen in 2-and 3-year-old male Thoroughbred horses; commonly, the onset of lameness was immediately following training gallops or racing. There were 13 humeral stress fracture episodes in 12 horses. Ten were in the proximal caudolateral cortex, and three were in the distal craniomedial cortex. Radial stress fractures were seen in three horses, all in the midshaft radius. Tibial stress fractures were diagnosed in 11 horses. They were located in the proximal lateral tibia in six horses, the distal caudolateral tibia in three horses, and the midshaft tibia in three horses. Fifteen stress fractures were diagnosed with radiographs alone, one was diagnosed with scintigraphy alone, nine were diagnosed with radiographs and scintigraphy, and, in two horses, radiographs were negative, but the scintigraphic findings were consistent with stress fracture. 相似文献
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羔羊小肠pH及主要消化酶发育规律的研究 总被引:13,自引:2,他引:13
对小尾寒羊羔羊小肠不同部位(十二指肠、空肠和回肠)pH及淀粉酶、胰蛋白酶、糜蛋白酶、脂肪酶和乳糖酶的活性进行了测定,结果表明:羔羊小肠不同部位内容物pH不同,回肠pH显著高于空肠,空肠和回肠pH显著高于十二指肠,羔羊1月龄后,小肠各段pH变化不大;小肠不同部位淀粉酶和胰蛋白酶、糜蛋白酶及脂肪酶活性不同,空肠段淀粉酶、胰蛋白酶、糜蛋白酶及脂肪酶活性高于十二指肠和回肠段,随着羔羊日龄的增长,小肠淀粉酶、胰蛋白酶、糜蛋白酶及脂肪酶活性增加,3月龄后各消化酶活性变化差异不显著(P<O.05);羔羊小肠不同部位乳糖酶活性不同,空肠乳糖酶活性显著高于十二指肠和回肠,随着羔羊日龄的增长,小肠乳糖酶活性逐渐降低。 相似文献
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鸭胰腺内高血糖素—,胰岛素—和生长抑素—免疫反应细胞的形态及分布 总被引:1,自引:0,他引:1
用ABC免疫组织化学方法,对1 周龄绍鸭胰腺内的高血糖素(A)、胰岛素(B)和生长抑素(D)免疫反应细胞的形态及分布进行了观察。结果表明,上述3 种细胞在全胰的分布及形态有差异。A 细胞主要成群散在于A 胰岛,少数位于混合型胰岛的边缘。D 细胞主要散在于A 胰岛中,少数位于B胰岛和混合型胰岛的边缘。B细胞主要呈团块状分布于B胰岛,少数位于混合型胰岛的中央。在胰外分泌部有散在的A 和D 细胞,位于腺泡及导管上皮细胞之间或结缔组织中。A 细胞形态各异,以多边形为主,多数细胞伸出形态多样的胞质突起,伸达胰岛或其他细胞间。D细胞的形态与A 细胞相似。B细胞形态均一,呈圆形或卵圆形,未见胞质突起,在外分泌部未见到B细胞。 相似文献
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2009--2010年,对新疆部分地区蛋鸡、肉鸡、家养水禽的养殖场随机采集血清样品10193份,活禽市场采集血清样品1620份。用HI方法对禽流感免疫抗体进行检测,结果表明:蛋鸡的H5免疫抗体合格率为33.33%~100%,其中0效价率为33.33%-80.00%;H9免疫抗体合格率为62.4%-100%,20%-33%蛋鸡场存在100%的0效价现象。肉鸡H5免疫抗体合格率为0%-100%,其中7.69%-69.6%肉鸡群中H5抗体0效价率为100%。水禽的H5免疫抗体合格率为0%-100%,有25%33.33%鸭群全部是0效价。活禽市场H5抗体效价≥410g2的比例为10.59%-83.57%,H9抗体效价至410醇的比例21.70%-67.14%。 相似文献
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家兔亚硒酸中毒的病理形态学研究 总被引:1,自引:0,他引:1
给家兔分别肌肉注射不同剂量的亚硒酸钠,历时入周,复制出亚急性硒中毒的动物模型。病理形态学变化为:家兔的生长受到明显抑制,肝,肾,心,脾等组织器官损害严重如肝实质细胞变性,坏死;肾实质退行病变;心肌纤维变性,充血,肺淤血,水肿:脾萎缩,淋巴细胞坏死,肝,肾,心细胞内线粒高度肿胀,嵴减少,断裂或消失成空泡。 相似文献
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2009—2010年,对新疆部分地区蛋鸡、肉鸡、家养水禽的养殖场随机采集血清样品10193份,活禽市场采集血清样品1620份。用HI方法对禽流感免疫抗体进行检测,结果表明:蛋鸡的H5免疫抗体合格率为33.33%~100%,其中0效价率为33.33%~80.00%;H9免疫抗体合格率为62.4%~100%,20%~33%蛋鸡场存在100%的0效价现象。肉鸡H5免疫抗体合格率为0%~100%,其中7.69%~69.6%肉鸡群中H5抗体0效价率为100%。水禽的H5免疫抗体合格率为0%~100%,有25%~33.33%鸭群全部是0效价。活禽市场H5抗体效价≧4log2的比例为10.59%~83.57%,H9抗体效价≧4log2的比例21.70%~67.14%。 相似文献
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White nodules were observed in the thyroid in two male C3H mice (at 99 and 122 weeks of
age) exposed to fast neutrons at the age of 8 weeks. Histopathologically, in both cases,
tumors were developed in the region corresponding to the parathyroid gland, and the tumor
cells were arranged in a solid sheet or nest-like structures. Necrosis, cell debris and/or
hemorrhage were sometimes seen in the center of the tumor structures. Tumor cells were
small and uniform with scanty cytoplasm, cell margins were indistinct, and basally located
tumor cells were aligned along the vascular stroma. Mitotic figures were frequently
observed. Metastasis to the renal cortex was observed in both cases. These cases were
diagnosed as parathyroid carcinoma. A parathyroid tumor is an extremely rare endocrine
tumor in mice, regardless of whether the tumor is spontaneous or experimentally induced.
These cases may have been induced by neutron-exposure; however, how radiation induces
parathyroid carcinoma in mice is not clear. 相似文献
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为了解广西中小规模养猪户面临的问题,以问卷形式对广西贵港、北海、玉林、柳州、南宁等地19个乡镇148个农户进行调查。结果显示20头母猪以上大户占75%,投入在5万元以上,从业多年,养猪是主要收入来源,户主多为中学文化水平,用工3~10人;5~20头母猪中户占17%,母猪在5头以下的小户占8%。大户对乳猪料认识好,用得多,占32%,但有50%的大户对价格比较敏感。农户饲养土杂猪的比例占60%,饲养快大猪占35%,纯土猪只有5%。大户的种猪多来自种猪场占25%,而小农户多数自己留种或在村里购买,占60%;对选种多数看外表占66%,15%的人会关注生产记录。普遍使用大猪场的精液,占80%。调查表明将中小规模养猪户并入产业链,统一规范管理,平衡合作农户的计酬,形成一站式服务是中小规模养猪户的发展趋势。 相似文献
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野生黄鼬消化管组织结构的观察 总被引:1,自引:1,他引:0
通过组织学观察,探讨野生黄鼬消化管的组织结构特点.将8只野生黄鼬经乙醚麻醉后处死,解剖取食管、胃、小肠、大肠,制作石蜡切片,观察其组织结构.结果显示野生黄鼬食管的黏膜为复层扁平上皮,食管腺发达,肌层以骨骼肌为主.胃贲门部有发达的皱襞和贲门腺;胃底腺有大量的主细胞和壁细胞;胃大弯部的腺体以壁细胞为主,仅有少量主细胞;胃幽门部有发达的幽门腺和大量壁细胞.十二指肠黏膜层有小肠腺,内有潘氏细胞存在,黏膜下层含有十二指肠腺;空肠可见孤立淋巴小结、弥散淋巴组织及集合淋巴小结.结肠无皱襞和肠绒毛,大肠腺排列紧密,其中杯状细胞特别多;直肠固有膜内有发达的大肠腺.所以野生黄鼬消化管的特点是胃各部胃腺发达,壁细胞特别多. 相似文献
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XU Jia-ming ZHANG Zheng-fen HUA Guo-hong YU Hui HUANG De-chun ZHAO Hai-quan LI Hua 《中国畜牧兽医》2017,44(11):3201-3207
In order to develop product and improve breeding for Guangxi partridge chickens,the slaughter performance,amino acids,inosine acid and fatty acids contents in muscle were measured and evaluated for Guangxi partridge chickens at 120 days old,which were raised at same nutrition level and management. Carcass traits and meat characteristics were evaluated. The results were showed that the dressing percentage and eviscerated yield percentage of cocks and hens were 90.15%,92.57% and 69.12%, 68.08%,respectively. The total amino acids in the breast and leg muscles of cocks and hens were 20.37,18.40 and 21.30, 18.44 g/100 g,respectively. The ratio of essential amino acids to total amino acids in breast and leg muscles of cocks and hens were 39.32%,42.33% and 42.72%, 43.06%,respectively,and essential amino acid index (EAAI) were 84.33,88.82 and 90.44, 90.77,respectively. The content of delicious,sweet,branched chain amino acids and inosinic acid in breast muscle were 0.85 g/100 g,0.42 g/100 g,0.56 g/100 g and 1.55 mg/g higher than that in leg muscle,respectively,and the content of sweet amino acids in hens was 0.40 g/100 g more than that in cocks. The first limiting amino acid was Met+Cys in muscle of Guangxi partridge chickens. Oleic acid and linoleic acid were mainly components of unsaturated fatty acids in muscle,palmitic acid and stearic acid were mainly components of saturated fatty acids in muscle. The relative content of polyunsaturated fatty acids and essential fatty acids in leg muscle were higher than that in breast muscle, and their contents in hens were more than that in cocks. All these showed that the Guangxi partridge chickens had good meat production,flavor and high nutrition value,meanwhile the nutritional values in hens were superior than that in cocks. 相似文献