共查询到20条相似文献，搜索用时 62 毫秒
1.
为探究褐藻寡糖及其锌络合物对暗纹东方鲀的生长、血清免疫相关酶活性、消化酶活性及肠道菌群的影响,实验以暗纹东方鲀为研究对象,在饲料中分别添加0.23%褐藻寡糖、0.23%褐藻寡糖锌,挑选270尾规格均一、体表无伤的河豚,随机分3组,每组3个平行养殖桶,每桶30尾,分别投喂无寡糖的饲料、含0.23%褐藻寡糖的饲料、含0.23%褐藻寡糖锌的饲料,完成8周饲养实验。结果显示:褐藻寡糖对暗纹东方鲀起到促生长作用但不显著(P>0.05);相比于对照组,褐藻寡糖组、褐藻寡糖锌组暗纹东方鲀血清溶菌酶活性分别提高201.761、51.235 U/mL,且存在显著差异(P<0.05);褐藻寡糖、褐藻寡糖锌均提高暗纹东方鲀肠道中的胃蛋白酶和纤维素酶活性,褐藻寡糖提高了α-淀粉酶活性,均无差异显著性(P>0.05)。饲料中添加褐藻寡糖、褐藻寡糖锌可提高暗纹东方鲀血清溶菌酶活性、肠道消化能力,同时维持暗纹东方鲀肠道的细菌多样性方面起到积极的作用。 相似文献
2.
养殖暗纹东方鲀鱼体粗蛋白与氨基酸的分析研究 总被引：1，自引：0，他引：1
本文对暗纹东方鲀的1龄鱼(体重40～80 g),2龄鱼(体重200～300 g)的粗蛋白及氨基酸进行了分析.结果表明:1龄鱼的粗蛋白含量比2龄鱼高8.15%(占干物质).1龄鱼的氨基酸总量比2龄鱼高3.53%.测定的18种氨基酸中,1、2龄鱼均以谷氨酸的含量为最高,分别为氨基酸总量的15.08%和15.05%.非常接近.在必需氨基酸中,除了2龄鱼的赖氨酸、精氨酸的含量明显高于1龄鱼外,其余氨基酸的组成和比例没有明显的差异,且必需氨基酸占总的氨基酸的比例(即EAA/TAA)也很接近,分别为43.17%和43.63%.本文同时对配制的暗纹东方鲀配合饲料的粗蛋白与氨基酸的含量进行分析并与鱼体的含量进行了比较,为进一步研制、开发暗纹东方鲀饲料提供了理论依据. 相似文献
3.
通过对集约化养殖中暗纹东方鲀常见寄生虫进行的调查,观察到7种常见寄生虫.对这些寄生虫所引起的疾病进行了流行病学和组织病理学的研究,提出了积极有效的预防和治疗措施. 相似文献
4.
5.
暗纹东方纯Takifugu obscurus(Abe),隶属 形目、纯科、东方纯属,俗称河纯,具有较高的经济价值,是我国长江水域重要的渔业资源.河纯作为一种极为名贵的高档水产品,市场销量很大,目前天然捕捞量已远远满足不了市场需求.为满足消费、保护资源,作者连续数年开展了暗纹东方纯人工繁殖与养殖的研究工作,现已由原先的试验阶段发展成较完善的规模化开发综合技术.本文即是暗纹东方纯规模化人工繁殖的技术总结. 相似文献
6.
暗纹东方朗隶属于朗形目,咖科,东方蚊属,俗中外,幼鱼应在低盐度水体中进行培育,有利十解决称河驰,为有毒的徊游性鱼类,但其肉质鲜美,脂 鱼苗和仔鱼的饲料问题,因为生活在海水中的浮游肪和蛋白质含量高,富含人体必需的多种氨基酸、维 植物、轮虫、丰年虫等活饵料比淡水种类易于培养,生素和微量元素,因此,颇受消费者的欢迎,在我国 有利于实现工厂化苗种生产,经试验,刚孵出的仔鱼民间素有“冒死吃河眈’之说。暗纹东方鲍自 1991 能在 12%。的盐度中生长发育,这样还可减少仔鱼病年人工繁殖成功以来,我国部分地区已开始进行规害的发生。由于暗纹… 相似文献
7.
8.
9.
集约化养殖暗纹东方纯常见寄生虫流行病学调查及防治研究 总被引：1，自引：0，他引：1
通过对集约化养殖中暗纹东方纯常见寄生虫进行的调查，观察到7种常见寄生虫对这些寄生虫所引起的疾病进行了流行病学和组织病理学的研究，提出了积极有效的预防和治疗措施。 相似文献
10.
通过对集约化养殖中暗纹东方鱼屯常见寄生虫进行的调查,观察到 7种常见寄生虫。对这些寄生虫所引起的疾病进行了流行病学和组织病理学的研究,提出了积极有效的预防和治疗措施。 相似文献
11.
12.
13.
14.
15.
高致病性禽流感免疫的管理环节 总被引：1，自引：0，他引：1
一 严管疫苗生产环节
兽用生物制品生产厂家多,品种较多,质量不一,免疫效果各异,特别是高致病性禽流感疫苗,由于生产时间较短,疫苗质量不够稳定,副作用较为严重,包装规格单一,技术服务滞后．严重地影响了高致病性禽流感的免疫效果。如有的厂家疫苗生产的批准文号和疫苗产品不相符。有的中试产品或有临时批准文号的疫苗,不按规定范围随意大面积推广,有的同一厂家生产的疫苗,不同批次质量不一,免疫效果差异较大。 相似文献
16.
17.
Strategies for Using eFSH for Superovulating Mares 总被引：1，自引：0，他引：1
Patrick M. McCue DVM PhD Melissa Patten BS David Denniston PhD Jason E. Bruemmer PhD Edward L. Squires PhD 《Journal of Equine Veterinary Science》2008,28(2):91-96
The standard treatment for superovulation of mares is to administer equine follicle-stimulating hormone (eFSH) for 4 to 5 days to stimulate multiple follicles and human chorionic gonadotropin (hCG) to induce synchronous ovulations. Objectives of this study were: (1) to determine whether a short-term (3-day) eFSH treatment protocol would result in similar ovulation and embryo recovery rates compared with the standard eFSH protocol; (2) to determine the efficacy of a decreasing dose of eFSH (step-down protocol) on ovulation rate and embryo recovery; (3) to compare the efficacy of hCG and recombinant equine luteinizing hormone (reLH) for inducing ovulation in FSH-treated mares; and (4) to compare embryo recovery rates and embryo size when mares are flushed at 6.5 or 7.0 days after ovulation. Forty light-horse mares were used in 2005 (experiment 1) and 20 different mares were used in 2006 (experiment 2). In experiment 1, mares were randomly assigned to one of three treatment groups: (1) untreated controls, (2) standard eFSH treatment (12.5 mg intramuscularly twice daily), and (3) 3-day eFSH treatment. In experiment 2, mares were randomly assigned to one of four treatments: (1) untreated controls, (2) standard eFSH protocol, (3) 3-day eFSH treatment, and (4) step-down eFSH treatment (12.5 mg twice daily day 1, 8.0 mg twice daily day 2, 4.0 mg twice daily day 3). Within each treatment, mares were given either hCG (2,500 IU) or equine LH (750 mg, EquiPure LH; reLH) to induce synchronized ovulations. Embryo recovery was performed either 6.5 or 7.0 days after ovulation. In experiment 1, numbers of preovulatory follicles and ovulations were less for mares in the 3-day treatment group than the standard group, but were greater than for controls. Embryo recovery per flush was higher in the standard group (2.6) than the 3-day eFSH treatment (0.8) or control groups (0.8). In experiment 2, the number of preovulatory follicles and number of ovulations were greater in the standard and 3-day treatment groups than in control and step-down groups. The percent embryo recovery per ovulation and mean embryo grade were similar for all groups; however, the embryo recovery per flush was higher for mares in the standard treatment than controls (1.3 vs 0.6) but was similar to the 3-day (1.1) and step-down (0.8) treatments. Embryo recovery was similar for flushes performed on days 6.5 and 7.0 post-ovulation. The percentage of control mares ovulating within 48 hours in response to hCG or reLH was similar. In contrast, a higher percentage of eFSH-treated mares ovulated within 48 hours in response to reLH than hCG (92% vs 71%). In both years, the 3-day eFSH treatment protocol resulted in a greater number of preovulatory follicles and a greater number of ovulations than untreated controls. Unfortunately, the increased ovulation rate for mares administered eFSH for 3 days did not result in a greater number of embryos recovered per flush in either year. Use of a step-down eFSH treatment protocol resulted in fewer preovulatory follicles, fewer ovulations, and fewer embryos as compared with the standard eFSH treatment. In conclusion, the standard eFSH treatment resulted in a greater embryo recovery rate per cycle than either the 3-day or step-down treatment protocols. Recombinant equine LH was more effective than hCG in causing ovulation in eFSH-treated mares. 相似文献
18.
Mariana Ftima Z. F. Nogueira Simara M. Marcato Antnio C. Furlan Vittor Zancanela Eline Maria Finco Daiane de O. Grieser Caroline E. Stanquevis Taciana M. de Oliveira‐Bruxel 《Animal Science Journal》2019,90(7):870-879
Three experiments were carried out to determine the crude protein requirements for maintenance (CPm) and weight gain (CPg) of meat quail and to develop protein‐requirement prediction models. Experiment 1 was conducted to determine CPm by the nitrogen‐balance technique. The regression of nitrogen balance on nitrogen intake revealed a CPm requirement of 2.94 g/kg0.75/day. Experiment 2 was aimed at determining CPm by the comparative‐slaughter technique. Retained nitrogen (RN) and nitrogen intake (NI) were quantified considering the metabolic weight of the birds. The linear regression of RN on NI provided a CPm estimate of 6.63 g/kg0.75/day. Experiment 3 was conducted to determine CPg. The regression of body nitrogen from the carcasses on fasted body weight revealed CPg estimates of 407.68 (0–7 days), 501.76 (8–14 days), 470.40 (0–14 days), 517.44 (15–21 days), 627.20 (22–28 days), 423.36 (29–35 days), and 517.44 mg/g (15–35 days). The protein‐requirement prediction models developed for meat quail aged 0–7, 8–14, 0–14, 15–21, 22–28, 29–35, and 15–35 days were CP = 2.94.W0.75 + 0.408.G; CP = 2.94.W0.75 + 0.502.G; CP = 2.94.W0.75 + 0.470.G; CP = 2.94.W0.75 + 0,517.G; CP = 2.94.W0.75 + 0.627.G; CP = 2.94.W0.75 + 0.423.G; CP = 2.94.W0.75 + 0.517.G, respectively, where: W0.75 = metabolic weight (kg), and G = daily weight gain (g). 相似文献
19.
20.
Transgenic pigs for xenotransplantation for humans] 总被引：1，自引：0，他引：1
H Niemann 《DTW. Deutsche tier?rztliche Wochenschrift》1999,106(4):141-146
Transgenic livestock have been generated via microinjection of DNA-constructs into pronuclei of zygotes. However, efficiency is low and only 1-3% transgenic offspring are to be obtained. Integration of the transgene occurs at random and expression is independent from the number of integrated copies but can be affected by the integration site. To overcome the shortage of human organs, transgenic pigs have been generated that express human complement regulatory genes. This approach enables to overcome the hyperacute rejection response as shown by an average survival rate (40-90 days) of the immunosuppressed primate recipients receiving a heart from a transgenic pig. It is expected that transgenic pigs would be available as organ donors in the next 5-10 years. A major prerequisite, however, is the prevention of the potential transfer of pathogenic microorganisms, in particular porcine endogenous retroviruses (PERV). Improvements of the efficiency in the generation of transgenic pigs will be achieved by the use of genetically modified donor cells in nuclear transfer technology (cloning). 相似文献