THE DOCTOR'S DREAM     

Vaughan VC 《Science (New York, N.Y.)》1914,39(996):149-154

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现代母猪管理的挑战     

王永康  Betsy Newton 《国外畜牧学(猪与禽)》2001,(6):27-30

现代母猪的基因型不同于传统母猪的基因型 ,这是毫无疑问的。近年来所见母猪生产率的提高 ,并不仅仅归因于遗传改进 ,而是还与设施、健康状况和管理方法的改进有关。然而 ,现代母猪已被特别培育成具有更高产、更高泌乳量、更强的母性和更高的胴体瘦肉率 (见表 1 )。　表 1　现代母猪和传统母猪基因型的特点性状现代母猪传统母猪基因型差异 ( % )窝产仔数　总数 11 6 10 0 +16　活产数 10 89 0 +2 0断奶仔数　窝断奶数 9 97 5 +32年断奶数 2 2 0 15 0 +47断奶窝重 (千克 )　校正至 2 1日龄断奶重 6 3 5 4 0 8+5 5母猪躯体成分　成年体重…  相似文献   

Predicting effective doses for the joint action of two fungicide applications   总被引：1，自引：0，他引：1  

N. D. Paveley †  J. M. Thomas  T. B. Vaughan  N. D. Havis  D. R. Jones 《Plant pathology》2003,52(5):638-647

A function was derived to predict fungicide efficacy when more than one application of a single active ingredient is made to a crop, given parameters describing the dose–response curves of the component single-spray applications. In the function, a second application is considered to act on that proportion of the total pathogen population which was uncontrollable at the time of the first application (represented by the lower asymptote of the dose–response curve for the first treatment), plus any additional part of the population which survived the first application as a result of a finite dose being applied. Data to estimate the single-spray dose–response curve parameters and validate predictions of two-spray programme efficacy were obtained from separate subsets of treatments in four field experiments. A systemic fungicide spray was applied to wheat at a range of doses, at one or both of two times (t₁ and t₂), in all dose combinations. Observed values of the area under the disease progress curve (AUDPC) for septoria leaf blotch (Mycosphaerella graminicola) were used to construct response surfaces of dose at t₁ by dose at t₂ for each culm leaf layer. Parameters were estimated from single-spray and zero-dose treatment data only. The model predicted a high proportion (R² = 71–95%) of the variation in efficacy of the two-spray programmes. AUDPC isobols showed that the dose required at t₂ was inversely related to the dose at t₁, but the slope of the relationship varied with the relative timings of t₁ and t₂ in relation to culm leaf emergence. Isobols were curved, so the effective dose – the total dose required to achieve a given level of disease suppression – was lower when administered as two applications.  相似文献   

Climate change. Why is it hard to predict the future of ice sheets?     

Vaughan DG  Arthern R 《Science (New York, N.Y.)》2007,315(5818):1503-1504

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The equine prepurchase examination     

Vaughan JT 《Journal of the American Veterinary Medical Association》2007,231(10):1492-1493

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Evaluation of serum 25-hydroxyvitamin D,C-reactive protein,and haptoglobin as biomarkers in dogs newly diagnosed with histoplasmosis     

Betsy Hernandez  Jared A. Jaffey  Leah A. Cohn  Robert C. Backus  Kate KuKanich  Andrew S. Hanzlicek  Valerie J. Parker  Mary E. White  Randy Ringold  Emily Westerback  Leah Freilich  Charlotte Bolch 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2023,37(2):476-483

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Dose titration of an injectable formulation of lufenuron in cats experimentally infested with fleas     

Blagburn BL  Vaughan JL  Butler JM  Parks SC 《American journal of veterinary research》1999,60(12):1513-1515

OBJECTIVES: To identify the lowest single dose of lufenuron injected s.c. that results in a 90% disruption of the flea (Ctenocephalides felis) life cycle for 6 months in cats. ANIMALS: 40 domestic shorthair cats (20 males, 20 females) between 5 and 7 months old. PROCEDURE: Cats were randomly assigned to 1 of 5 eight-cat groups and experimentally infested with C. felis on days -8, -7, -6, and -4. On day 0, cats in the 4 treatment groups were treated with an injectable formulation of lufenuron at doses of 2.5, 5, 10, or 20 mg/kg of body weight, respectively. Control cats received the injectable formulation without lufenuron. Experimental infestations were repeated and flea eggs collected at various intervals for 196 days after treatment. Eggs were placed in media and incubated in an insectary for 28 days to determine effects of injectable lufenuron on egg and larval development. Number of adults that emerged from eggs were compared among groups. RESULTS: Lufenuron injected once at a dose of 10 or 20 mg/kg, but not at 2.5 or 5 mg/kg, resulted in a 90% decrease in number of adult fleas emerging from eggs for 196 days after treatment. CONCLUSIONS AND CLINICAL RELEVANCE: Results indicate that control of flea egg and larval development for at least 6 months can be achieved in cats with a single s.c. injection of lufenuron (10 mg/kg). The injectable formulation may provide veterinarians and cat owners an alternative to the tablet formulation of lufenuron.  相似文献   

Effects of the fungal endophyte Acremonium coenophialum in fescue on pregnant mares and foal viability.   总被引：1，自引：0，他引：1  

M R Putnam  D I Bransby  J Schumacher  T R Boosinger  L Bush  R A Shelby  J T Vaughan  D Ball  J P Brendemuehl 《American journal of veterinary research》1991,52(12):2071-2074

Effects of the endophyte Acremonium coenophialum in tall fescue on pregnant mares and foal viability were evaluated. Twenty-two mature pregnant mares were randomly chosen to graze either Kentucky-31 tall fescue that was free from A coenophialum (endophyte-free, EF) or tall fescue infected with A coenophialum (endophyte-present, EP) after the first 90 days of pregnancy through parturition. Concentrations of pyrrolizidine and ergopeptine alkaloids were significantly greater in EP grass, compared with EF pasture. Ten of 11 mares grazing EP pasture had obvious dystocia. Mean duration of gestation was significantly greater for the EP group, compared with the EF group. Foal survivability was severely reduced among mares grazing EP fescue with only 1 foal surviving the natal period. Udder development and lactation were low in mares grazing EP grass. The absence of clinical problems in mares grazing EF grass implicated the endophyte as the causative agent of reproductive problems and perinatal foal mortality in pregnant mares grazing endophyte-infected fescue grass. Caution should be exercised in allowing pregnant mares to graze pastures infected with the endophyte A coenophialum.  相似文献   

The acute colitis syndrome. Colitis "X"   总被引：1，自引：0，他引：1  

J T Vaughan 《The Veterinary clinics of North America》1973,3(2):301-313

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The pathogenicity for mice of two species of salmonella isolated from the green iguana (Iguana iguana)     

G W Boam  V L Sanger  D F Cowan  D P Vaughan 《Journal of the American Veterinary Medical Association》1970,157(5):689-690

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