Anticoccidial efficacy of diclazuril in pheasants     

O Vanparijs  L Hermans  R Marsboom 《The Veterinary record》1990,126(14):332-333

Diclazuril, a new anticoccidial drug, was tested in young pheasants artificially infected with the three most common pathogenic species of Eimeria, E colchici, E duodenalis and E phasiani. In two replicate experiments each with 40 birds the mortalities in the infected controls were 50 and 25 per cent. Diclazuril was administered in the feed at dose levels of 1, 2 and 4 ppm from the day before the inoculation of coccidia until the end of the test on day 6 after infection. The 1 ppm dose failed to inhibit the development of the parasite completely, as was shown by a reduction of the weight gain of the birds and the output of a small number of oocysts. Diclazuril at 2 or 4 ppm adequately controlled the infection, with weight gains similar to those of the uninfected controls. At all dose levels, mortality, intestinal lesions and diarrhoea were prevented.  相似文献   

Detection of rotavirus antigen in diarrhoeic and non-diarrhoeic piglets in Nigeria     

D J Atii  C K Ojeh  O A Durojaiye 《Revue d'élevage et de médecine vétérinaire des pays tropicaux》1990,42(4):494-496

Faecal samples from 96 piglets with acute gastroenteritis and 41 samples from non-diarrhoeic piglets were investigated for porcine rotavirus (PRV) antigens by enzyme-linked immunosorbent assay (ELISA). PRV was detected in 43 of 96 (44.8%) in the diarrhoeic group whilst none of the samples in the non-diarrhoeic group was positive for PRV (P less than 0.01). Age distribution of infection showed a higher infection rate of 30.2% in piglets aged 1-3 weeks, which was significantly higher (P less than 0.05) than in piglets aged 4-6 weeks, where the infection rate was 14.6 per cent. No PRV antigen was detected in diarrhoeic piglets above 6 weeks of age. Titration of 10 randomly selected ELISA-positive samples showed titres ranging from 512 to greater than or equal to 4.096.  相似文献   

Formation of soils with contrasting textures by translocation of clays rather than ferrolysis in flooded rice fields in Northeast Thailand   总被引：1，自引：0，他引：1  

P. Boivin †  A. Saejiew  O. Grunberger  & S. Arunin 《European Journal of Soil Science》2004,55(4):713-724

This paper describes the conditions for dispersion and flocculation of clays, and the impact of this process on soils of contrasting textures cropped with rice. Clay seems to be translocated down the profiles and along a topographic sequence. The clays are mixed kaolinite–smectite. The cation exchange capacity of these clays exceeds 20 cmol_c kg^?1. Both the proportion of smectite and clay content increase with increasing depth and from the top to the lower part of the sequence. The pH ranges from 5 to 8. The aluminium oxide content is small. The soil solutions collected during the rainy season were analysed for Fe²⁺ and major cations. We calculated the sodium adsorption ratios (SAR) taking into account Fe²⁺ and compared them with the critical coagulation concentration (CCC) found in a previous study. The Fe²⁺ contributed to a decrease in the SAR of cropped soils. The comparison between SAR, total electrolyte concentrations and CCC values showed that the dispersible clays are likely (i) to disperse in the abandoned and non‐saline fields, (ii) to flocculate in the saline and uncropped soils as a result of the large salt content and in the cropped soils because of either large salt or Fe²⁺ content, and (iii) to disperse in the flood water and at the surfaces of abandoned fields under rain. No evidence for ferrolysis was found. The observed contrasting textures and clay mineralogy can be explained by clay translocation controlled by salinity and rice farming.  相似文献   

A NOTE ON APPARATUS REPAIR     

O GB 《Science (New York, N.Y.)》1914,40(1042):892-893

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THE PATHOGENIC ACTION OF PHYMATOTRICHUM OMNIVORUM     

Watkins GM  Watkins MO 《Science (New York, N.Y.)》1939,90(2338):374-375

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Factors affecting the estimation of concentration of sperm in ram's semen by the photoelectrometric method     

EMIK LO  SIDWELL GM 《Journal of animal science》1947,6(4):467-475

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Methods of feeding soybeans and their supplementation in a hogging-off program     

HALVERSON JO  HOSTETLER EH  SMITH FH 《Journal of animal science》1947,6(4):385-394

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THE ADMINISTRATION OF THE WEEKS ACT     

Smith GO 《Science (New York, N.Y.)》1912,35(890):103-104

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METEORITE SHOWER AT MODOC,KANSAS     

Farrington OC 《Science (New York, N.Y.)》1906,23(589):582-583

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UNIVERSITY AND EDUCATIONAL NOTES     

Smith GO 《Science (New York, N.Y.)》1928,67(1725):67-69

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