Protection of turbot, Scophthalmus maximus (L.), and rainbow trout, Oncorhynchus mykiss (Richardson), against vibriosis using two different vaccines

Abstact. The potency of a whole-cell bacterin (WCB) and a toxoid enriched whole-cell vaccine (WCEB) administered intraperitoncally into rainbow trout, Oncorhynchus mykiss (Richardson), were compared. The most effective vaccine was further evaluated by bathing turbot, Scophthalmus maximus (L.). These vaccines were composed of three strains of V. anguillarun , of the serotypes 01 and 02. Both vaccines conferred the highest protection against strains of serotype 01 within 4 weeks. With the toxoid enriched vaccine giving the best results (77 RPS). When trout were revaccinated after 7 weeks with this vaccine, good protection was achieved against strains of serotypes 01 and 02. Interestingly, when the WCEB was administered by bath to turbot, acceptable levels of protection against strains of both serotypes were obtained after 4 weeks of immunization.     

Use of androgenesis in intersubspecific hybrid rice breeding

Significant differences of callus induction, green plant regeneration and culture efficiency were observed among restorer lines and their hybrids in rice. Average callus induction percentage of F₁, hybrids was about twice that of their parents. Twenty doubled haploid (DH) lines that showed normal fertility with both indica and japonica CMS lines, were selected as widely compatible restorers (WCRs). TG8 derived from CPSLO17/Minghui 63 not only showed normal fertility to both indica and japonica test varieties and CMS lines, but also exhibited superior agronomic traits, in particular short plant, desired plant type, high tillerability, large panicles, good grain quality and resistance to rice blast disease. Strong heterosis for yield was observed in crosses between indica or japonica CMS lines and TG8. TG8 possessed a dominant, widely compatible gene (WCG) that was inherited from the variety CPSLO17. Results confirmed that the anther culture technique is a quick and effective way of developing widely compatible restorers in rice and that it is applicable to the direct use of intersubspecific heterosis with the three-line method.     

行业媒体的"特别贡献"纪念中国饲料工业协会成立20周年

改革开放以来,我国的饲料工业发展之快、之好,举世惊叹。在纪念中国饲料工业协会成立20周年的时候,人们自然不会忘记行业协会为促进饲料工业发展所做的重大贡献。在讲到中国饲料工业协会的贡献时,人们也自然不会忘记她的媒体立下的汗马功劳,不会忘记行业媒体所做的特别贡献。所     

活性面筋粉的生产与应用

本文介绍西德杰克林公司生产活性面筋粉的工艺与设备,其产品作为添加剂对面团流变特性有明显的改良作用。     

Pathogenicity of Campylobacter jejuni for turkeys and chickens.

A Campylobacter jejuni isolate obtained from a turkey liver, designated C101, and a C. jejuni isolate obtained from the feces of a chicken, designated C111, were used to inoculate their respective hosts. Isolate C101 depressed weight gain by 20% when inoculated into newly hatched poults or 4-day-old poults. It also caused death, hepatic necrosis, and generalized hemorrhages in turkey embryos. The chicken-derived isolate, C111, did not reduce weight gain in newly hatched chicks, but it did induce mortality in chicken embryos. The supernatant of the cultures of both C. jejuni isolates also caused mortality in embryos.     

Susceptibility to onion-induced hemolysis in dogs with hereditary high erythrocyte reduced glutathione and potassium concentrations.

The hemolytic effect of onion consumption in dogs with hereditary high erythrocyte reduced glutathione and potassium concentrations (designated HK dogs) was compared with that in clinically normal dogs. Twelve hours after oral administration of boiled onions (200 g/dog), hemoglobin concentration decreased to 84.4% of the initial value in HK dogs; it decreased only to 90.5% in clinically normal dogs. At 24 hours, methemoglobin concentration was significantly (P less than 0.05) higher in HK dogs than in clinically normal dogs. The concentration of erythrocyte oxidized glutathione increased about fivefold at 10 hours in HK dogs, whereas it did not change during the experimental period in clinically normal dogs. In addition, at 12 hours, the proportion of erythrocytes containing Heinz bodies increased to 24.4% in HK dogs, but increased only to 1.2% in clinically normal dogs. Thus, results indicated that HK dogs were more susceptible to the oxidant action of onions than were clinically normal dogs.     

我国牦牛染色体研究现状

综述了近10年来我国牦牛染色体研究的情况,认为牦牛与普通牛在部分常染色体和Y染色体结构上的差异是导致犏牛雄性不育的原因之一,并指出我国牦牛染色体的研究,今后应以染色体带型标准化,染色体带型与经济性状的相关性,牦牛与其它牛种染色体的比较研究等为主攻方向。