Serological responses of specific pathogen-free foals to equine herpesvirus-1: primary and secondary infection, and reactivation.     

J S Gibson  T O'Neill  A Thackray  D Hannant  H J Field 《Veterinary microbiology》1992,32(3-4):199-214

Serum antibody (virus neutralisation, complement fixation, IgM and IgG) responses to equine herpesvirus-1 (EHV-1) infection were measured in six foals which were initially free from EHV-1 and EHV-4 infection and maternally-derived antibodies. Following primary infection, high titres of virus neutralisation and complement fixation antibodies were detectable against EHV-1, however, corresponding antibody levels against EHV-4 were low or inapparent, although the two viruses share a number of cross-reactive epitopes. In addition, following the primary infection with EHV-1, IgM levels increased before those of IgG, virus neutralisation and complement fixation antibodies, peaked sooner and thereafter declined. Stimulation of IgM levels was observed on secondary infection with EHV-1 given 61 days later. In contrast, IgG, virus neutralisation and complement fixation antibodies following primary infection were more sustained and no increase in their levels was observed on secondary infection. No consistent changes in IgM or IgG levels were seen after administration of dexamethasone to reactivate latent virus.  相似文献   

Effect of feed intake during late development on pubertal onset and resulting body composition in crossbred gilts.     

E A Newton  D C Mahan 《Journal of animal science》1992,70(12):3774-3780

A total of 105 nonboar-exposed, F2 ([Landrace x Yorkshire] x Duroc) gilts were used in two replicates of a randomized complete block experiment to evaluate the effect of dietary feed intake on pubertal onset and subsequent body composition. Feed intakes were established at 50% of ad libitum (AL-50), 75% of ad libitum (AL-75), or at ad libitum (AL-100) levels from 4.5 to 9 mo of age. A corn-soybean meal diet fed to all gilts was formulated to meet or exceed nutrient requirements except for energy. Puberty was measured by two methods: 1) monitored once daily by back pressure applied by the herdsman or 2) from elevated plasma progesterone concentrations. Body composition was evaluated by the deuterium oxide method after plasma progesterone concentrations were elevated. Daily feed intake for the experimental period averaged 1.6, 2.3, and 3.2 kg, and the BW of gilts at 8 mo of age were 111, 131, and 154 kg for the AL-50, AL-75, and AL-100 groups, respectively. Body weight, backfat thickness, and body fat content increased linearly (P < .01) as feed intake increased, but age at puberty was not severely influenced. A minimum body fat content or percentage did not seem to initiate pubertal onset. There was a trend for a lower percentage of the AL-50 gilts to ovulate (P = .08) than those fed the AL-75 and AL-100 intakes. An inverse relationship resulted between the percentage of gilts that ovulated to the percentage that showed behavioral estrus.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   

Surgical Complications and Wound Healing in the Small Animal Practice          下载免费PDF全文

Craig W. Miller 《The Canadian veterinary journal. La revue veterinaire canadienne》1995,36(7):454

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Managing the lactating sow for optimal weaning and rebreeding performance.     

M D Tokach  G D Dial 《Veterinary Clinics of North America: Food Animal Practice》1992,8(3):559-573

Management of the lactating sow influences milk production and subsequent reproduction through changes in nutrient intake. The management goal during lactation is to maximize feed intake. Decreasing the effective environmental temperature, increasing the nutrient density of the lactation diet, maintaining fresh adequate supplies of feed and water, and preventing excess weight gain during the prior gestation period will increase nutrient intake during lactation. Effective environmental temperature of the lactating sow can be maintained in the thermoneutral zone by using drip cooling, increased ventilation rates and flooring materials with superior conductive properties. Sow parity, genetics, litter size, and disease level will also influence feed intake. Management practices must account for these factors and, thus, should be tailored to individual farm situations to ensure adequate nutrient intake and prevent aberrations in subsequent reproductive performance.  相似文献   

Diverticula of the urinary bladder in a juvenile dog.          下载免费PDF全文

A M Remedios  D M Middleton  S L Myers  C A Outerbridge    P M Arnold 《The Canadian veterinary journal. La revue veterinaire canadienne》1994,35(10):648-650

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An Ecological Foodniche Concept as a Proxy for Fish-Pond Stocking Rates in Integrated Aquacultural Farming for Malaysia     

Howard A.  Clonts Curtis M.  Jolly  Syed Abdulkadir  L. Alsagoff 《Journal of the World Aquaculture Society》1989,20(4):268-276

The merits of integrated aquaculture farming (IAF) as a strategy for bolstering income for the rural poor have been recognized, but the economic efficiency and sustainability are yet to be determined. The effects of one species on another and the economic benefits, net of government support, have not been critically evaluated. The concept of a foodniche for alternative species in an aquatic environment has not been properly tested in an economic setting. Thus, this report reflects the results of applying the technique of mixed integer linear programming to determine the optimum combination of species within the context of a foodniche. The objective also included maximizing revenues, with minimal external input requirements, for a representative small Malaysian wet-rice farm. It was found that the foodniche concept permitted flexibility in stocking rates, and that farmers could actually stock species at the exact rate that was optimal for profit, instead of standard fixed rates. Also, government subsidies for pond construction were essential for IAF success. The net revenues from IAF were low without interest-free loans for pond construction.  相似文献   

Experience with fireblight in the Czech Republic1     

M. B&#x;halov 《EPPO Bulletin》2004,34(3):365-367

Erwinia amylovora has been spreading in the Czech Republic since 1986 regardless of emergency phytosanitary measures which have been taken. Its spread follows the predominant wind direction (west to east). The infested area now covers two thirds of the area of the country. Wild Crataegus spp. are the most important and widespread host plants. E. amylovora is still regulated as a quarantine pest, and areas free from fireblight are subject to special phytosanitary measures.  相似文献   

Plum pox virus (PPV) in Norway     

D. R. Blystad  T. Munthe 《EPPO Bulletin》2006,36(2):212-212

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Analysis of a Long-term Experiment with Repeated-measurement Models     

C. Richter  B. Kroschewski 《Journal of Agronomy and Crop Science》2006,192(1):55-71

Long‐term experiments are a classical case of repeated measurements. Traits are measured on the same experimental unit over many years so that correlations arise between the observations made on the same plot in consecutive years. This paper describes the analysis of a three‐crop‐rotation long‐term experiment. We analysed the yields of the crops and the organic carbon content in the topsoil over 30 consecutive years. Several variance–covariance approaches are discussed and the trait‐specific best fit is interpreted. Mixed models are used to describe the structure of the experiment. Both yields and soil organic carbon show a more or less pronounced variance heterogeneity. Especially for yields, the heterogeneity of cycles and years is dominant. The consideration of correlations results in a better model fit in all cases.  相似文献   

Dilated Cardiomyopathy in Juvenile Doberman Pinschers     

Andrea Vollmar DVM  Dipl. ECVIM-CA  Philip R. Fox DVM  MSc  Dipl. ACVIM  ECVIM-CA  Dipl. ACVECC  Kathryn M. Meurs DVM  PhD  Dipl. ACVIM  Si-Kwang Liu DVM  PhD  Dipl. ACVIM 《Journal of Veterinary Cardiology》2003,5(1):637

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