Studies on the Maturation and Spawning of Milkfish Chanos chanos Forsskal in a Photoperiod-Controlled Room     

Cheng-Sheng  Lee Clyde S.  Tamaru G. M. Weber 《Journal of the World Aquaculture Society》1987,18(4):253-259

Progress in propagation of milkfish has been impeded by the shortage of mature broodstock. This study was a first step toward revealing the environmental cues for the maturation of milkfish. Experiments were carried out during 1978-1985 in an indoor tank (5.2 × 4.8 × 13 m) under photoperiod control and in an outdoor tank (63 × 5.4 × 13 m). In two controlled, long-photoperiod regime experiments, 86 and 83% of the fish matured, the highest percentages yet reported. In these experiments, milkfish matured one month earlier than the normal spawning season, two months after the fish were exposed to the long daylight regime. Only 21% of the fish under a natural photoperiod regime in the outdoor tank matured. Results of the current study suggest that a change and increase in photoperiod are necessary for the onset of maturation.  相似文献   

cDNA cloning of foot-and-mouth disease virus     

L Meyer  H W Heinrich  S Weber 《Archiv fuer experimentelle veterinaermedizin》1987,41(5):665-670

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X-Chromosomal Monosomy (77, XO) in a Doberman Pinscher With Gonadal Dysgenesis     

F. W. K. Smith Jr  DVM  L. C. Buoen BA    A. F. Weber DVM  PhD    S. D. Johnston DVM  PhD    J. F. Randolph DVM  D. J. Waters DVM 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》1989,3(2):90-95

A 6-month-old stunted female Doberman Pinscher was found to have a 77,X0 chromosomal complement. The ovaries were small, consisting primarily of interstitial-type cells and solid epithelial cords. The dam, sire, and a male littermate had normal karyotypes.  相似文献   

Triploidy (117,XXX) in a stillborn canine pup conceived with frozen semen     

S D Johnston  L C Buoen  A F Weber  T L Lin 《Journal of the American Veterinary Medical Association》1989,194(10):1446-1448

Analysis of skin fibroblast cultures from a deformed stillborn female Alaskan Malamute pup revealed a 3n = 117,XXX (normal, 2n = 78,XX) chromosome count. The triploid pup was delivered by cesarean section 5 days after estimated date of parturition, because the bitch failed to start labor. The bitch had been inseminated with thawed frozen semen deposited into the lumen of the uterus approximately 4 days after ovulation. Gross anatomic abnormalities of the pup included omphalocele, diaphragmatic hernia, persistent right aortic arch, atresia ani, and no right forelimb distal to the scapula. The pup also had arthrogryposis of the left carpus, kyphosis of the thoracic vertebrae, widely separated cranial sutures, open fontanelles, hydrocephalus, and cleft palate. Suspected cause of the triploidy was dispermy of an aged oocyte after intrauterine deposition of the thawed frozen semen. Numeric chromosome abnormalities may be causes of fetal deformity or death that can be detected by fetal karyotype.  相似文献   

Viral antibodies in bovine fetuses in Argentina     

G.B. Pinto  P. Hawkes  O. Zabl  E. Ulloa  I.A. Lager  E.L. Weber  A.A. Schudel 《Research in veterinary science》1993,55(3):135

In order to establish the prevalence of viral infections of the bovine fetus in Argentina, a serological survey for antibodies against viral agents currently affecting cattle in this country was conducted. Antibodies against foot-and-mouth disease virus (FMDV), bovine herpesvirus-1 (BHV-1), bovine leukaemia virus (BLV), bovine rotavirus (BRV), bovine coronavirus (BCV), bovine viral diarrhoea virus (BVDV) and parainfluenza-3 (PI-3) were investigated in a total of 315 fetal serum samples. Conventional techniques were used: indirect immunofluorescence (FMDV, BHV-1, BVDv and BCV), radial immunodiffusion (BLV), ELISA (BRV) and haemagglutination inhibition (PI-3). Antibodies against BHV-1, BVDV and PI-3 were detected in samples from fetuses in the second and third trimester of gestation, with a prevalence of 1·21 per cent (two of 165), 2·03 per cent (four of 197) and 5·08 per cent (nine of 177), respectively. Either antibodies or non-antibody factors able to bind to BRV and Bcv antigens were detected with a prevalence of 2·44 per cent (five of 205) and 4·54 per cent (five of 110), respectively. In addition, 14·68 per cent of non-specific inhibitors of PI-3 mediated haemagglutination were found. No seropositives against FMDV and BLV were detected.  相似文献   

Demonstration of Campylobacter jejuni in fecal samples from dogs     

A Weber  C Lembke  R Sch?fer  U Seifert  H Berg 《Berliner und Münchener tier?rztliche Wochenschrift》1983,96(7):232-234

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Cultural determination of anaerobic cocci especially Micrococcus indolicus, in milk samples from heifers with the so-called summer mastitis]     

A Weber  T Schliesser  G Steiner 《DTW. Deutsche tier?rztliche Wochenschrift》1977,84(5):165-167

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Dried whole blood on filter discs for the detection of IBR/IPV antibodies in ELISA     

C Spirig  H Weber  U Kihm  H K Müller  L Bruckner  M Ackermann 《Schweizer Archiv für Tierheilkunde》1987,129(10):529-535

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Zum Vorkommen von Spermiogenesezellen in Stierejakulaten**     

Von B. Mayr  G. Hager  A. Weber  E. Knaus  M. Mayr  W. Schleger 《Reproduction in domestic animals》1979,14(2):55-58

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Buchbesprechungen     

E. Gundermann  W. Kroth  P. Seibert  K. J. Lang  E. Weber 《European Journal of Forest Research》1974,93(1):118-120

Ohne Zusammenfassung  相似文献