Availability to rhodesgrass (Chloris gayana) of nitrogen in tops and roots added to soil     

A.W. Moore 《Soil biology & biochemistry》1974,6(4):249-255

¹⁵N-labelled Rhodesgrass material was prepared by growing plants in sand culture with labelled ammonium sulphate as their source of nitrogen. In a greenhouse experiment the labelled plant material in various physical configurations was added to an alluvial soil (fine sandy loam) from Samford with or without added mineral nitrogen. Two crops (six harvests) of Rhodesgrass were grown in the soil and the recovery of labelled nitrogen followed with time. Its partition at the end of the experiment was also determined.In general, after 16 months about one-third was recovered in the plant and two-thirds remained in the soil (plus any undecomposed added plant material). The only indication of volatile losses was a probable deficit of up to 10 per cent where litter (above-ground material) was placed on the soil surface.A higher nitrogen concentration in litter (1.3 per cent compared with 0.8 per cent) resulted in only a slight increase in labelled nitrogen recovery. Addition of mineral nitrogen (six doses of 50 kg N/ha) increased recovery from added litter material from 22 to 28 per cent and from added root material from 23 to 30 per cent.Grinding of added root material did not affect recovery. In the litter experiment, placing on the surface, incorporating in the top 2.5 cm of soil. and grinding and mixing with the soil resulted in final recoveries of 14, 28 and 32 per cent respectively.It is pointed out that caution must be exercised in extrapolation of results from laboratory and greenhouse studies to the field because many of the treatments used in the former are not analogous to field practices.  相似文献   

Primary hyperparathyroidism in a dog     

J W Wilson  S G Harris  W D Moore  H W Leipold 《Journal of the American Veterinary Medical Association》1974,164(9):942-946

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Heat exposure and the fatty acid composition of the plasma of the young lamb     

R C Noble  J H Moore 《Research in veterinary science》1974,17(2):204-209

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A review of naturally occurring Brucella abortus infections in wild mammals   总被引：2，自引：0，他引：2  

C G Moore  P R Schnurrenberger 《Journal of the American Veterinary Medical Association》1981,179(11):1105-1112

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Mandatory continuing veterinary education requirements in the United States and Canada     

Moore DA  Klingborg DJ  Wright T 《Journal of veterinary medical education》2003,30(1):19-27

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Evaluating the stages of veterinary practitioner learning for continuing education needs assessment and program evaluation     

Moore DA 《Journal of veterinary medical education》2003,30(1):50-56

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The advantages and disadvantages of endoscopy     

Moore LE 《Clinical Techniques in Small Animal Practice》2003,18(4):250-253

Endoscopy is generally a very safe and effective tool in the diagnosis and therapy of various gastrointestinal (GI) disorders, and must be used in conjunction with other diagnostic modalities. Endoscopy should not be a substitute for a complete work-up. There are many advantages of endoscopy, including minimal morbidity and mortality, and the sensitivity of this modality in the diagnosis of mucosal disorders of the GI tract. However, complications may occur, and there are limitations to endoscopy. This article will provide an overview of when to choose GI endoscopy and when other procedures might provide more information.  相似文献   

Carcinoma of the apocrine glands of the anal sac in dogs: 113 cases (1985-1995)     

Williams LE  Gliatto JM  Dodge RK  Johnson JL  Gamblin RM  Thamm DH  Lana SE  Szymkowski M  Moore AS;Veterinary Cooperative Oncology Group 《Journal of the American Veterinary Medical Association》2003,223(6):825-831

OBJECTIVE: To characterize the signalment, clinical signs, biological behavior, and response to treatment of carcinoma of the apocrine glands of the anal sac in dogs. DESIGN: Retrospective study. ANIMALS: 113 dogs with histologically confirmed carcinoma of the apocrine glands of the anal sac. PROCEDURE: Data on signalment, clinical signs, and staging were reviewed and analyzed along with treatment modality for potential association with survival time. RESULTS: Sex distribution was approximately equal (54% female, 46% male). One hundred four dogs underwent treatment consisting of surgery, radiation therapy, chemotherapy, or multimodal treatment. Median survival for treated dogs was 544 days (range, 0 to 1,873 days). Dogs treated with chemotherapy alone had significantly shorter survival (median, 212 days) than those receiving other treatments (median, 584 days). Dogs not treated with surgery had significantly shorter survival (median, 402 days) than those that underwent surgery as part of their treatment (median, 548 days). Dogs with tumors > or = 10 cm2 had significantly shorter survival (median, 292 days) than dogs with tumors < 10 cm2 (median, 584 days). Hypercalcemia was identified in 27% (n = 29) of dogs, and those dogs had significantly shorter survival (median, 256 days), compared with those that were normocalcemic (median, 584 days). Dogs with pulmonary metastasis had significantly shorter survival (median, 219 days) than dogs without evidence of pulmonary metastasis (median, 548 days). CONCLUSIONS AND CLINICAL RELEVANCE: Unlike most previous reports, this study revealed an approximately equal sex distribution, and results suggest a more favorable prognosis.  相似文献   

Prophylactic use of decoquinate for infections with Cryptosporidium parvum in experimentally challenged neonatal calves     

Moore DA  Atwill ER  Kirk JH  Brahmbhatt D  Herrera Alonso L  Hou L  Singer MD  Miller TD 《Journal of the American Veterinary Medical Association》2003,223(6):839-845

OBJECTIVE: To evaluate the effect of daily oral administration of decoquinate to neonatal calves experimentally challenged with various numbers of Cryptosporidium parvum oocysts. DESIGN: Clinical trial. ANIMALS: 75 calves. PROCEDURE: Calves were purchased from a commercial dairy during a 5-week period. Calves were housed in individual hutches and fed milk replacer with or without decoquinate (2 mg/kg [0.9 mg/lb per day]). Calves were randomly assigned to treatment and 1 of 5 challenge groups (0, 50, 100, 1000, or 10,000 C. parvum oocysts in 60 mL of saline [0.9% NaCl] solution administered p.o. on the day after arrival). Calves were maintained in the study for as long as 28 days. Calves were clinically assessed for diarrhea and dehydration. Fecal samples were submitted for oocyst enumeration 3 times each week. RESULTS: Treatment did not affect number of days to first watery feces (diarrhea), number of days to first oocyst shedding, or duration of diarrhea or oocyst shedding. Duration of oocyst shedding was significantly associated with challenge dose of oocysts administered to calves and number of days to first oocyst shedding. Duration of diarrhea and number of days to first oocyst shedding were significantly associated with week of arrival and number of days to first watery diarrhea. CONCLUSIONS AND CLINICAL RELEVANCE: Daily treatment with decoquinate at the dosage used in this study did not affect oocyst shedding or clinical signs associated with cryptosporidiosis. However, there was an indication that if the number of oocysts calves received could be reduced, then the duration of oocyst shedding and, hence, environmental loading of C. parvum oocysts could be reduced.  相似文献   

Comparison of three techniques for estimating the forage intake of lactating dairy cows on pasture     

Macoon B  Sollenberger LE  Moore JE  Staples CR  Fike JH  Portier KM 《Journal of animal science》2003,81(9):2357-2366

Quantifying DMI is necessary for estimation of nutrient consumption by ruminants, but it is inherently difficult on grazed pastures and even more so when supplements are fed. Our objectives were to compare three methods of estimating forage DMI (inference from animal performance, evaluation from fecal output using a pulse-dose marker, and estimation from herbage disappearance methods) and to identify the most useful approach or combination of approaches for estimating pasture intake by lactating dairy cows. During three continuous 28-d periods in the winter season, Holstein cows (Bos taurus; n = 32) grazed a cool-season grass or a cool-season grass-clover mixture at two stocking rates (SR; 5 vs. 2.5 cows/ha) and were fed two rates of concentrate supplementation (CS; 1 kg of concentrate [as-fed] per 2.5 or 3.5 kg of milk produced). Animal response data used in computations for the animal performance method were obtained from the latter 14 d of each period. For the pulse-dose marker method, chromium-mordanted fiber was used. Pasture sampling to determine herbage disappearance was done weekly throughout the study. Forage DMI estimated by the animal performance method was different among periods (P < 0.001; 6.5, 6.4, and 9.6 kg/d for Periods 1, 2, and 3, respectively), between SR (P < 0.001; 8.7 [low SR] vs. 6.3 kg/d [high SR]) and between CS (P < 0.01; 8.4 [low CS] vs. 6.6 kg/d [high CS]). The period and SR effect seemed to be related to forage mass. The pulse-dose marker method generally provided greater estimates of forage DMI (as much as 11.0 kg/d more than the animal performance method) and was not correlated with the other methods. Estimates of forage DMI by the herbage disappearance method were correlated with the animal performance method. The difference between estimates from these two methods, ranging from -4.7 to 5.4 kg/d, were much lower than their difference from pulse-dose marker estimates. The results of this study suggest that, when appropriate for the research objectives, the animal performance or herbage disappearance methods may be useful and less costly alternatives to using the pulse-dose method.  相似文献