Effect of feed intake on antimicrobially induced increases in porcine serum insulin-like growth factor I     

Hathaway MR  Dayton WR  White ME  Henderson TL  Young DA  Doan TN 《Journal of animal science》1999,77(12):3208-3214

This study was conducted to determine whether an antimicrobially induced (ASP-250) increase in serum IGF-I was the result of differences in feed intake. Serum IGF-I concentrations were measured in crossbred pigs that were fed a control diet or a diet supplemented with ASP-250 either for ad libitum consumption or limited to 85% of the control pigs' consumption. The pigs that consumed either diet ad libitum, control or ASP-250, consumed similar quantities of feed. The ASP-250 ad libitum-intake pigs had serum IGF-I concentrations that were greater (P<.01) than those of their ad libitum-intake control littermates. Similarly, the ASP-250 limit-fed pigs had serum IGF-I concentrations that were greater (P<.01) than those of the controls. Although the serum IGF-I concentrations of pigs fed the ASP-250-supplemented diet for ad libitum intake were greater than the serum IGF-I concentrations of the pigs limit-fed the ASP-250-supplemented diet, the differences were not significant (P<.08). The ASP-250-fed pigs had higher serum IGF binding protein (BP)-3 concentrations than did their control littermates (P<.003). A time course of antimicrobially induced alterations in serum IGF-I concentrations revealed that the effect of increased serum IGF-I levels in ASP-250-supplemented pigs (P<.02) was observed within 4 d and was maintained throughout the 4-wk study. These findings show that feed intake is not responsible for the increase in serum IGF-I observed with ASP-250 supplementation. Additionally, the antimicrobially induced increase in serum IGF-I concentrations occurs within a few days after initiation of the treatment.  相似文献   

Clinical trial of parvaquone for the treatment of East Coast fever in Kenya   总被引：1，自引：0，他引：1  

S Chema  S Waghela  A D James  T T Dolan  A S Young  W N Masiga  A D Irvin  G H Mulela  L S Wekesa 《The Veterinary record》1986,118(21):588-589

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The occurrence of Demodex aurati and Demodex criceti in the Syrian hamster (Mesocricetus auratus) in the United Kingdom     

D Owen  C Young 《The Veterinary record》1973,92(11):282-284

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Pituitary gonadotropins in boars as affected by dietary protein and age     

T G Althen  R J Gerrits  E P Young 《Journal of animal science》1974,39(3):601-605

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Infleuce of dietary levels of vitamin E and selenium on tissue and blood parameters in pigs.   总被引：1，自引：1，他引：0       下载免费PDF全文

L G Young  J H Lumsden  A Lun  J Claxton    D E Edmeades 《Canadian journal of veterinary research》1976,40(1):92-97

Eighteen barrows approximately three weeks of age were used in a 3 X 3 factorial arrangement to investigate the effect of level of supplemental vitamin E and selenium on tissue and blood parameters. Tissue selenium concentrations increased in a quadratic manner with increased selenium intake with kidney tissue containing considerably greater concentrations than liver, heart or muscle. Supplementation of the diet caused a three-fold increase in serum selenium within the first week with a slight tendency to further increases in subsequent weeks. Serum vitamin E of unsupplemented pigs declined by fifty percent during the experiment, whereas supplemental vitamin E resulted in increased serum vitamin E. There was a considerable viration in percent peroxide hemolysis. Correlation of -0.63 between percent peroxide hemolysis and vitamin E intake and -0.85 between percent peroxide hemolysis and serum vitamin E were observed.  相似文献   

An improved method of handling ticks collected from the field     

A S Young  R M Newson 《Research in veterinary science》1973,15(1):133-135

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Renal and parathyroid changes produced by high calcium intake in growing pullets     

S M Shane  R J Young  L Krook 《Avian diseases》1969,13(3):558-567

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Evaluation of a method to estimate the prevalence of congenital malformations in swine, using a mailed questionnaire   总被引：2，自引：0，他引：2  

L A Selby  C J Marienfeld  W Heidlage  H T Wright  V E Young 《The Cornell veterinarian》1971,61(2):203-213

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Flow cytometric assessment of ethylene glycol monoethyl ether on spermatogenesis in rats   总被引：1，自引：0，他引：1  

Yoon CY  Hong CM  Cho YY  Chung YH  Min HK  Yun YW  Lee BJ  Yang KH  Lee YS  Kim CK 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2003,65(2):207-212

The effects of ethylene glycol monoethyl ether (EGEE) on testicular cell populations in rats were investigated by a flow cytometric method. Rats were administered by gavage with EGEE at the various doses of 0 (saline alone), 100, 200, 400, and 800 mg/kg body weight/day for 4 weeks. The treatment of EGEE caused decreases in the weight of testis and epididymis and in the number of testicular cells. Histopathologically, exfoliation of germ cells into the tubular lumen was observed at the doses of above 200 mg/kg. The treatment of EGEE at the dose of 400 mg/kg caused moderate testicular degeneration. A significant depletion of haploid cells and a disproportionate ratio of diploid and tetraploid cells were observed as determined by flow cytometric analysis. These results indicate that the toxic effect of EGEE on the male reproductive system may be strongly associated with the disproportion of testicular germ cells.  相似文献   

Does the Presence of Detached Root Border Cells of Zea mays Alter the Activity of the Pathogenic Nematode Meloidogyne incognita?     

Rodger S  Bengough AG  Griffiths BS  Stubbs V  Young IM 《Phytopathology》2003,93(9):1111-1114

ABSTRACT The root-knot nematode Meloidogyne incognita is a major pathogen of a range of important crops. Currently, control is typically achieved by the use of nematicides. However, recent work suggests that manipulating the ability of roots to slough off border cells, which then act as a decoy to the nematode, can significantly decrease damage to the roots. We investigated the attractiveness of border cells to M. incognita and the response of the nematode to border cells in close proximity. We found very limited attraction, in that nematodes did not preferentially alter direction to move toward the border cells, but a large and significant increase in nematode speed was observed once they were in the immediate vicinity of border cells. We discuss the results in the context of physical and biological mechanisms in relation to the control of pathogenic nematodes.  相似文献