Der heutige Stand der Reblausfrage in Ungarn     

J. Jablonowski 《Journal of pest science》1925,1(2):18-19

Ohne Zusammenfassung  相似文献   

Effect of Collection Rhythms and Season on Rabbit Semen Production     

A Nizza  C Di Meo  S Taranto 《Reproduction in domestic animals》2003,38(6):436-439

The effects of collection regimen and time of year on rabbit semen production were determined in this study. A total of 14 crossbreed Hyla bucks were used in winter and summer. In each season, rabbits were assigned to two groups. In group 1, (n = 7) rabbits were subjected to an extensive collection regimen (two ejaculates per male, once daily/week) and in group 2, (n = 7) a semi‐intensive semen collection regimen was performed (two ejaculates per male, twice weekly). The traits recorded for each sample were libido, volume, pH, motility, sperm concentration, percentage of alive spermatozoa and sperm abnormalities. The results obtained in this study indicate that when increasing collection frequency, the rate of useful collections decreased (from 0.81 ± 0.017 to 0.69 ± 0.016; p < 0.01). The rate of useful collection also decreased in the transition from winter to summer (from 0.79 ± 0.018 to 0.70 ± 0.017; p < 0.01). Among the ejaculate characteristics studied, only volume/ejaculate (from 0.64 ± 0.015 to 0.53 ± 0.017; p < 0.01) and spermatozoa/ml (from 406 ± 15 to 359 ± 13 million; p < 0.01) appeared negatively affected by collection. In winter fewer volume/ejaculates were produced (0.55 ± 0.015 vs 0.60 ± 0.016 ml; p < 0.01) and fewer spermatozoa/ml (360 ± 14 vs 394 ± 16 million; p < 0.01) than in summer. The doses produced per ejaculate decreased as collection frequency increased, but the number of doses produced per week was higher in the semi‐intensive than the extensive rhythm (26.5 ± 2.1 vs 20.9 ± 1.5; p < 0.01). The results suggest that a semi‐intensive rhythm may be viewed favourably.  相似文献   

Linkage and QTL mapping for Sus scrofa chromosome 7   总被引：1，自引：0，他引：1  

G. Yue  A. Stratil  S. Cepica  J. Schröffel Jr    D. Schröffelova  L. Fontanesi  M. Cagnazzo  G. Moser  H. Bartenschlager  G. Reiner  H. Geldermann 《Zeitschrift für Tierzüchtung und Züchtungsbiologie》2003,120(S1):56-65

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Incidence of Salmonellae in Captive and Wild Free‐Living Raptorial Birds in Central Spain     

M. P. Reche  P. A. Jimnez  F. Alvarez  J. E. García de los Ríos  A. M. Rojas  P. De Pedro 《Zoonoses and public health》2003,50(1):42-44

A total of 595 faecal samples from raptorial birds, either captive or free‐living, residing in GREFA Wildlife Hospital were bacteriologically examined using various selective media and an Automated Diagnostic Assay System for Salmonella detection. Serotype and phage type of the strains identified as Salmonella was determined. In the captive group, of the 285 samples examined, 21 (7.36%) were positive for Salmonella. Serotyping revealed that most of the individuals were infected by Salmonella serotype Havana. This result suggested that there could be a source of contamination in the Hospital although it could not be established. In the wild free‐living group, over 310 samples examined (4.19%) were positive for Salmonella. The Salmonella isolates showed a major variety of serotypes: Enteritidis, Adelaide, Brandenburg, Newport, Typhimurium, Hadar, Saintpaul and Virchow. Most of them are similar to those commonly described in isolates from human and domestic animals. These results indicate that wild birds could be involved in the dissemination of Salmonella in humans or domestic animals or vice versa.  相似文献   

Balancing genetic diversity, genetic merit and population viability in conservation programmes     

N. Piyasatian  B. P. Kinghorn 《Zeitschrift für Tierzüchtung und Züchtungsbiologie》2003,120(3):137-149

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鸡球虫病的免疫控制   总被引：9，自引：0，他引：9  

Shirley M.W  蔡建平  谢明权 《中国家禽》2003,25(7):33-35

球虫一旦感染鸡并在其体内定居,就处于宿主免疫系统的监测下并设法建立寄生生活。球虫在鸡体内最长可持续生存14天,且几乎都位于宿主肠壁深层的细胞内,并完全依赖于宿主营养,最多可进行4代生长、增殖(无性生殖)的过程。鸡在感染后数小时即对球虫产生反应,大约4天即可产生特异性的保护性免疫反应,且足以限制再感染。免疫反应强度与许多因素有关,如感染剂量及感染虫种的特性等,但通常一次摄入少量卵囊即足以诱导能充分抵御再感染的免疫反应。虽然认为免疫接种是控制鸡球虫病的实用方法已有50多年,但在化学治疗的鼎盛时代,疫苗使用常被忽略,仅…  相似文献   

Immunodiscrimination Between Native and Recombinant Somatotropin: a Possible Pathway?     

Guidi  A.  Iannone  G.  Castigliego  L.  Gianfaldoni  D. 《Veterinary research communications》2004,28(1):193-196

Veterinary Research Communications -  相似文献   

Identification of Cytokeratins in Bovine Sperm Outer Dense Fibre Fractions     

E Hinsch  JG Boehm  S Groeger  F Mueller-Schloesser  K-D Hinsch 《Reproduction in domestic animals》2003,38(2):155-160

Outer dense fibres (ODF) are important substructures of mammalian sperm tails that are involved in the regulation of sperm motility. In this study, we investigated the identity of several sodium dodecyl sulphate (SDS)‐insoluble ODF proteins. Bovine ODF were purified by separating sperm heads and tails using ultrasound and Percoll^® density gradient centrifugation. Sperm flagella were treated with the detergent cetyltrimethylammonium bromide (CTAB). CTAB‐insoluble material, which reportedly represents the ODF fraction, was collected, and electron microscopy confirmed a highly purified ODF fraction. We found after solubilization of this fraction with SDS that high amounts of insoluble material were retained after centrifugation. SDS‐insoluble material was collected and quantitatively dissolved in 8 M urea. SDS‐gel electrophoresis in the presence of urea revealed polypeptides with apparent molecular masses of approximately 25, 43, and 50 kDa. Subsequent immunoblotting with anti‐cytokeratin antibodies detected two urea‐soluble, SDS‐insoluble proteins with apparent molecular masses of 45 and 66 kDa. The 45‐kDa protein was identified as cytokeratin 19. An antibody reacting with a palette of cytokeratins (CK 1–18 and CK 20), KL1, was the only antibody that reacted with the 66‐kDa polypeptide. We conclude that sperm ODF fractions contain at least one each of type I and type II intermediate filaments. As keratins and intermediate filaments are described as rope‐like structures, we suggest that these intermediate filaments play an important structural or tension‐bearing role in sperm flagella.  相似文献   

Analysis of In vitro Fertilizing Capacity to Evaluate the Freezing Procedures of Boar Semen and to Predict the Subsequent Fertility     

E Sellés  J Gadea  R Romar  C Matás  S Ruiz 《Reproduction in domestic animals》2003,38(1):66-72

A porcine in vitro fertilization (IVF) system and seminal quality parameters of frozen–thawed boar semen were used to assess the effectiveness of two different thawing rates of frozen boar semen, and to address the question of whether differences between fertility of ejaculates could be predicted in a limited field trial. In the first experiment, two thawing procedures were analysed (37°C, 30 s; 50°C, 12 s) and no differences in sperm quality were found. However, when the procedure was 50°C, 12 s the IVF results showed a higher number of sperm per penetrated oocyte and a near 10 points higher rate of pronuclear formation. In the second experiment, the fertility results obtained in the limited field trial show to be efficient enough for application in a commercial use, especially for three of the employed boars (fertility ≥80%). In this limited study, the conventional seminal parameters are not accurate enough to discriminate good and bad boars in relation to fertility. On the contrary, parameters of in vitro penetrability are more precise to predict subsequent fertilities. As conclusion, the IVF fertilization system seems to be a good tool to evaluate the quality of frozen–thawed boar semen previous to its commercial way, to verify the bank semen storage quality and a good way to assay new sperm freezing procedures, as it is the more precise evaluating method in estimating the potential fertilizing ability.  相似文献   

THE SIZE OF STREPTOCOCCUS BACTERIO-PHAGES AS DETERMINED BY X-RAY INACTIVATION     

Exner FM  Luria SE 《Science (New York, N.Y.)》1941,94(2443):394-395

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