Derald J Holtkamp
Affiliation: Iowa State University
- Investigation of strategies for the introduction and transportation of replacement gilts on southern Ontario sow farmsKate Bottoms
Department of Population Medicine, Ontario Veterinary College, University of Guelph, Ontario, Canada
BMC Vet Res 8:217. 2012..Two subsets of variables were retained for analysis; one subset pertained to how replacements were managed upon arrival to the farm, and the other pertained to the transportation of genetic animals...
- Identifying questions in the American Association of Swine Veterinarian's PRRS risk assessment survey that are important for retrospectively classifying swine herds according to whether they reported clinical PRRS outbreaks in the previous 3 yearsDerald J Holtkamp
Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, USA
Prev Vet Med 106:42-52. 2012..Sections with a high percentage of questions identified as unimportant included (1) characteristics of the site, (2) disposal of dead animals and waste management and (3) employee and visitors...
- A prospective study evaluating duration of swine breeding herd PRRS virus-free status and its relationship with measured riskDerald J Holtkamp
Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, 1600 S 16th St, Ames, IA 50011, USA
Prev Vet Med 96:186-93. 2010..The association between the risk of becoming positive to the PRRS virus and the external risk score was confounded by the method the site was established PRRS virus-free...
- [Terminology for classifying the porcine reproductive and respiratory syndrome virus (PRRSV) status of swine herds]D J Holtkamp
Iowa State University, 2233 Lloyd Veterinary Medical Center, Ames, IA 50011, USA
Tierarztl Prax Ausg G Grosstiere Nutztiere 39:101-12. 2011..Growing-pig herds are categorized as Positive or Negative. Recommended testing procedures and decision rules for herd classification are detailed...