Ram management for northeastern flocks     

W O Cottrell 《The Cornell veterinarian》1985,75(4):505-511

The ram is an important member of the flock, particularly in smaller, intensively managed flocks such as are found in the Northeast. An infertile ram can spell reproductive and financial failure for the producer. A highly fertile ram can settle more ewes in a shorter time, produce more twins, and confer valuable traits on his offspring. These include wool type, rate of gain and higher sperm production and ovulation rates. Details of the breeding soundness examination, including semen evaluation are discussed. Ram management techniques appropriate for Northeastern sheep producers are presented.  相似文献   

Blood sugar level following intravenous glucose in rheumatoid arthritis     

FLYNN JE  IRISH OJ 《Science (New York, N.Y.)》1946,104(2702):344-346

Since the majority of patients with rheumatoid arthritis show a slower fall in the blood sugar level after the intravenous injection of glucose than do the normal controls, the alteration cannot be explained on the basis of gastrointestinal dysfunction. Differences in the renal threshold of glucose do not explain the altered glucose tolerance, since approximately the same amount of glucose is lost in the urine in both groups. Blood samples taken at 3 and 5 minutes following the injection of the glucose showed the height of the blood sugar level to be approximately the same in the patients with rheumatoid arthritis and in normals. The slower fall in the blood sugar level of the former is therefore not a simple function of a greater rise following the intravenous administration of the glucose. Although the patients with severe poliomyelitis had as much or more atrophy than the rheumatoid arthritic patients, there was no delay in rate of fall of the blood sugar level after the intravenous administration of glucose. In view of the fact that the hepatic homeostatic control regulates the blood sugar level, faulty utilization of glucose by extrahepatic tissues cannot be considered the primary factor responsible for the alteration of the glucose tolerance. The altered glucose tolerance in rheumatoid arthritis is explainable on the basis of an altered threshold of the hepatic homeostatic control of the blood sugar. Additional studies must be done to determine whether this derangement emanates directly from extrahepatic influences.  相似文献   

CONTRIBUTIONS OF MEDICAL RESEARCH IN CHEMICAL WARFARE TO MEDICINE     

Bodansky O 《Science (New York, N.Y.)》1945,102(2656):517-521

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NEW METHODS IN THE STUDY OF STELLAR SPECTRA     

Struve O 《Science (New York, N.Y.)》1944,100(2595):253-257

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Über Spritzschäden an Kirschen nach Anwendung von Fluornatriumlösungen zur Bekämpfung der Kirschfliege     

O. Jancke 《Journal of pest science》1935,11(8):92-94

Ohne Zusammenfassung (Mit 7 Abbildungen.)  相似文献   

The effect of temperature on agglutination activity of coho salmon Oncorhynchus kisutch (Walbaum) antiserum     

P. J. O'LEARY  J. O. CISAR  J. L. FRYER 《Journal of fish diseases》1978,1(1):123-125

Abstract. The effects of temperature on the activity of antisera from coho salmon ( oncorhynchus kisutch ) and from rabbit were compared. Agglutination activity of salmon anti-Aeromonas salmonicida serum declined following incubation at 55°C whereas rabbit antiserum lost agglutination activity after incubation at 65°C.  相似文献   

RECENT ZOOPALEONTOLOGY     

O HF 《Science (New York, N.Y.)》1902,15(378):514-515

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Development of an inactivated vaccine for the protection of cattle against Aujeszky's disease     

O C Straub 《Berliner und Münchener tier?rztliche Wochenschrift》1990,103(7):225-229

The effects of an inactivated strain of Aujeszky's disease vaccine in cattle were investigated. It has not been possible to use vaccines licensed for use in pigs successfully in cattle even though cattle develop neutralizing antibodies to these vaccines. The addition of zinc compounds to the vaccines resulted in protection in cattle. The basis for the use of zinc is discussed. A mutant based vaccine was effective following local administration, but was not when administered parenterally. Anti-prostaglandin was not effective either, despite its successful use in sheep when administered with BHV1. The vaccine presents a prospect for immunising dogs and cats, and the addition of zinc compounds to other drugs and inducers is discussed.  相似文献   

Variation in the C:N ratio of substrate mineralized during forest humus decomposition     

O.Q. Hendrickson 《Soil biology & biochemistry》1985,17(4):435-440

Laboratory incubations of sieved (<2mm) forest humus were used to study the response of C and N mineralization to perturbation. Considerable variation in the ratio of mineralized C to mineralized N was observed. This ratio widened with increasing temperature. At constant temperature, addition of P stimulated CO₂-C evolution and reduced NH₄⁺-N production, also widening the C:N ratio of substrate mineralized. Addition of weak base stimulated mineralization of N more than C, reducing the C:N ratio of substrate mineralized. Addition of weak acid, mineral-N, or excessive amounts of water inhibited CO₂-C evolution while stimulating production of NH₄⁺-N, resulting in a “negative correlation” between the two, and reducing the C:N ratio of substrate mineralized still further.Results were interpreted in terms of effects on microbial biomass. A relatively benign treatment (P addition) may promote microbial growth and respiration, reducing net N availability. A moderate perturbation (addition of weak base) favors new organisms growing partly at the expense of microbial necromass. These organisms will mineralize some necromass-N, increase net N mineralization, and reduce the C:N ratio of substrate mineralized. Under severe conditions (addition of acid) the C:N ratio of substrate mineralized approaches that of the microbial biomass itself, suggesting that the biomass is the primary substrate mineralized. Microbial mortality is likely to be a significant factor affecting the supply of N in field situations, and should be included in any general model of soil N mineralization processes.  相似文献   

Erratum to: Effects of chronic and periodic exposures to ammonia on the eye health in juvenile Atlantic halibut (Hippoglossus hippoglossus)     

K. M. Liakonis  R. Waagbø  A. Foss  O. Breck  A. K. Imsland 《Fish physiology and biochemistry》2012,38(3):909-910

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