Efficacy of febantel paste against naturally acquired gastrointestinal nematodes of cattle     

C H Courtney  J K Shearer  Q Y Zeng  R G Arther 《Journal of the American Veterinary Medical Association》1988,193(6):665-667

Twenty calves with naturally acquired gastrointestinal nematode infections were assigned to 10 replicates of 2 calves each and were treated with febantel paste (5 mg/kg of body weight, PO) or an equivalent volume of paste vehicle (control calves). Adverse reactions were not observed after febantel treatment. At necropsy, gastrointestinal nematode counts in febantel-treated calves, compared with control calves, were reduced by over 99% for all major species except Trichuris discolor, counts of which were reduced by only 69%. Counts of gastrointestinal nematode eggs in feces of febantel-treated calves were reduced by 100% after treatment.  相似文献   

The establishment and maintenance of indwelling venous catheters in adult female pigs     

I J Shearer  G D Neal 《New Zealand veterinary journal》1972,20(5):73-75

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A method to generate and use as-applied surfaces to evaluate variable-rate fertilizer applications   总被引：1，自引：0，他引：1  

John P. Fulton  Scott A. Shearer  Steve F. Higgins  Timothy P. McDonald 《Precision Agriculture》2013,14(2):184-200

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Incisional infections associated with ventral midline celiotomy in horses     

Tara R. Shearer  Susan J. Holcombe  Stephanie J. Valberg 《Journal of Veterinary Emergency and Critical Care》2020,30(2):136-148

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Effects of various feed supplements containing fish protein hydrolysate or fish processing by-products on the innate immune functions of juvenile coho salmon (Oncorhynchus kisutch)     

Anthony L. Murray  Ronald J. Pascho  Stewart W. Alcorn  W. T. Fairgrieve  K. D. Shearer  D. Roley 《Aquaculture (Amsterdam, Netherlands)》2003,220(1-4):643-653

Immunomodulators administered to fish in the diet have been shown in some cases to enhance innate immune defense mechanisms. Recent studies have suggested that polypeptide fractions found in fish protein hydrolysates may stimulate factors in fish important for disease resistance. For the current study, groups of coho salmon were reared on practical feeds that contained either fish meal (Control diet), fish meal supplemented with cooked fish by-products, or fish meal supplemented with hydrolyzed fish protein alone, or with hydrolyzed fish protein and processed fish bones. For each diet group, three replicate tanks of fish were fed the experimental diets for 6 weeks. Morphometric measurements, and serologic and cellular assays were used to evaluate the general health and immunocompetence of fish in the various feed groups. Whereas the experimental diets had no effect on the morphometric and cellular measurements, fish fed cooked by-products had increased leucocrit levels and lower hematocrit levels than fish from the other feed groups. Innate cellular responses were increased in all feed groups after feeding the four experimental diets compared with pre-feed results. Subgroups of fish from each diet group were also challenged with Vibrio anguillarum (ca. 7.71×10⁵ bacteria ml⁻¹) at 15 °C by immersion. No differences were found in survival among the various feed groups.  相似文献   

Research opportunity     

Shearer RW 《Science (New York, N.Y.)》1978,199(4328):480

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Long-term ecosystem stress: the effects of years of experimental acidification on a small lake     

Schindler DW  Mills KH  Malley DF  Findlay DL  Shearer JA  Davies IJ  Turner MA  Linsey GA  Cruikshank DR 《Science (New York, N.Y.)》1985,228(4706):1395-1401

Experimental acidification of a small lake from an original pH value of 6.8 to 5.0 over an 8-year period caused a number of dramatic changes in the lake's food web. Changes in phytoplankton species, cessation of fish reproduction, disappearance of the benthic crustaceans, and appearance of filamentous algae in the littoral zone were consistent with deductions from synoptic surveys of lakes in regions of high acid deposition. Contrary to what had been expected from synoptic surveys, acidification of Lake 223 did not cause decreases in primary production, rates of decomposition, or nutrient concentrations. Key organisms in the food web leading to lake trout, including Mysis relicta and Pimephales promelas, were eliminated from the lake at pH values as high as 5.8, an indication that irreversible stresses on aquatic ecosystems occur earlier in the acidification process than was heretofore believed. These changes are caused by hydrogen ion alone, and not by the secondary effect of aluminum toxicity. Since no species of fish reproduced at pH values below 5.4, the lake would become fishless within about a decade on the basis of the natural mortalities of the most long-lived species.  相似文献