PMID: 9653998Jul 8, 1998Paper

The relationship between parasite counts, lesions, antibody titres and daily weight gains in Psoroptes ovis infested cattle

Veterinary Parasitology
J F LonneuxB Losson

Abstract

Psoroptes ovis counts, extent of lesions (clinical index: ClinI), daily weight gains (DWGs) and anti-P. cuniculi antibody titres in ELISA were recorded during seven therapeutic field trials. Relationship between these different data were studied. The differences between the mean DWG of treated and untreated control animals of the different trials ranged from 39 to 1206 g/day. Data were pooled for statistical analysis and the influence of trial conditions (management of the herd, farm, treatment) was extracted from each individual data by subtracting, from the DWG of each animal, the mean DWG of its trial. Such data were called daily weight gain over the trial mean (DWG/TM). Multiple regression of DWG/TM, calculated over the period between the clinical examinations in control animals (n = 40), on clinical indices and sex demonstrated a significant DWG/TM reduction per percentage of affected body surface according to the following equation: DWG/TM (in g/day)= 135-22 ClinI(0)-13 ClinI(28/35)-70 (if male) (R2 adjusted = 0.39), where ClinI(0) and ClinI(28/35) are the clinical indices recorded respectively at the beginning (day 0) and at the end (day 28 or 35) of the experimental period during which the animals were left untreated. A...Continue Reading

References

Feb 1, 1987·Veterinary Parasitology·N A Cole, F S Guillot
Apr 1, 1984·Journal of Economic Entomology·N A ColeC W Purdy
Apr 1, 1981·Journal of Economic Entomology·W F Fisher, F C Wright
May 1, 1993·The Veterinary Record·E M Heinze-MutzM Visser

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Citations

Jun 22, 2012·Veterinary Parasitology·C SarreE Claerebout
Mar 15, 2020·Parasites & Vectors·Wouter van MolEdwin Claerebout
Jan 25, 2011·The Veterinary Record·M LekimmeB Losson
Mar 20, 2012·The Veterinary Record·E S MitchellJ Williams

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