PROTOCOL     

Zwemer RL  Lowenstein BE 《Science (New York, N.Y.)》1940,91(2351):76

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Sectioned pelvic fin ray ageing of muskellunge Esox masquinongy from a Virginia river: comparisons among readers, with cleithrum estimates, and with tag–recapture growth data     

T. O. BRENDEN  E. M. HALLERMAN  & B. R. MURPHY 《Fisheries Management and Ecology》2006,13(1):31-37

Abstract  The potential utility of pelvic fin rays as ageing structures was evaluated for southern US muskellunge Esox masquinongy Mitchill populations by comparing age estimates among three readers and against cleithrum estimates, and by comparing observed length changes of tagged fish with changes predicted from growth equations based on pelvic fin ray age estimates. Mean coefficient of variation in age estimates among all readers and between the two readers with prior ageing experience was 17.8% and 5.6%, respectively. Exact and within 1-year agreement rates between pelvic fin rays and cleithra were 76% and 100%, respectively. Mean (± 2 SE) estimated absolute error between observed and predicted length changes for 13 tagged muskellunge was 30 ± 14 mm. This evaluation indicated that pelvic fin rays may prove to be a useful, non-lethal method for ageing muskellunge in southern US waters. Validation studies are still needed to ensure that growth rings form consistently throughout fish's life span.  相似文献   

饲料中抗营养因子--单宁的含量分析方法     

唐一国  龙瑞军  毕玉芬 《猪业科学》2003,20(10):59-60

针对近年来单宁在动物营养上的最新研究成果,本文重点阐述了饲料中缩合单宁、可水解单宁和总酚类化合物的分析方法。旨在为更好地利用含单宁饲料提供参考。  相似文献   

LETTER TO THE EDITOR     

Miller B 《Science (New York, N.Y.)》1884,3(56):244

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THE INTERNATIONAL GEOLOGICAL CONGRESS     

Marcou JB 《Science (New York, N.Y.)》1883,1(18):512-513

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A NEW TREATMENT OF FISTULOUS WITHER     

Geof.  Fethers B.V.Sc. 《Australian veterinary journal》1940,16(3):129-130

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Nllegorie     

B. Feuchter 《European Journal of Forest Research》1869,13(1):360-360

Ohne Zusammenfassung  相似文献   

Illusive memory     

T WB 《Science (New York, N.Y.)》1884,3(59):345

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THE CASE AGAINST THE CELL THEORY     

Luyet BJ 《Science (New York, N.Y.)》1940,91(2359):252-255

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Periodontal disease. Etiology and pathogenesis   总被引：1，自引：0，他引：1  

B Colmery  P Frost 《Veterinary Clinics of North America: Small Animal Practice》1986,16(5):817-833

Periodontal disease is the number-one cause of the early loss of teeth in dogs and cats. Some of the factors in the adult animal that play a major role in the development of periodontal diseases are discussed in this article, including overcrowding, malocclusions, diet, developmental defects, and metabolic and systemic disease.  相似文献