PMID: 9443329Jan 27, 1998Paper

A comparison of different models for assessing variations in the sero-prevalence of infectious bovine rhinotracheitis by farm, area and district in Kenya

Preventive Veterinary Medicine
J J McDermottM M Shoukri

Abstract

The relative variability of the sero-prevalence of antibodies to infectious bovine rhinotracheitis (IBR) due to cow, farm, and agroecological area levels were investigated for three contrasting districts in Kenya: Samburu, an arid and pastoral area; Kiambu, a tropical highland area; and Kilifi, a typical tropical coastal area. Cattle were selected by two-stage cluster sampling and visited once between August 1991 and 1992. Data on animal, farm, and area factors were analyzed using Schall's algorithm and MLn (multi-level, n-level), two generalized mixed-model programs suitable for multi-level analysis. Most variation in IBR sero-prevalence was from farm-to-farm. This was reflected by the many farm-level fixed effects (farm size, disease control measures and type of breeding) significant in models both ignoring and accounting for single variance components (clustering) at farm, area, and district levels. Area-to-area and district-to-district variations were noted but the area and district variance components were one-third and one-fifth the size of the farm variance components for both methods. As farm-to-farm variation differed markedly by farm size and district, models in MLn were extended to allow for multiple farm-level varia...Continue Reading

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Citations

Dec 31, 2003·Theriogenology·Veerle RonsseHervé Poulet
Mar 1, 2003·Preventive Veterinary Medicine·J J Solis-CalderonA Alvarado-Islas
Jul 2, 2003·Preventive Veterinary Medicine·Y H SchukkenJ J McDermott
Nov 11, 2008·Reproduction in Domestic Animals = Zuchthygiene·M DahlbomM Andersson
Mar 8, 2005·Preventive Veterinary Medicine·J M GriffinS J More
Jun 24, 2014·The Veterinary Journal·Kerli RaaperiArvo Viltrop
Sep 25, 2016·Research in Veterinary Science·R CallabyH Kiara
Nov 13, 2019·Preventive Veterinary Medicine·Mahdi Pourmahdi BorujeniFereshteh Roshani
Mar 9, 2010·Veterinary Microbiology·Carlos G das NevesMorten Tryland

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