References of "Leroy, Pascal"
     in
Bookmark and Share    
Full Text
See detailImportance économique des produits animaux et crise de la dioxine
Lebailly, Philippe ULg; Leroy, Pascal ULg; Burny, Philippe ULg

in Dioxine : de la crise à la réalité (2000)

Detailed reference viewed: 41 (11 ULg)
Peer Reviewed
See detailMethods for Estimating Areas under Receiver-Operating Characteristic Curves: Illustration with Somatic-Cell Scores in Subclinical Intramammary Infections
Detilleux, Johann ULg; Arendt, J.; Lomba, F. et al

in Preventive Veterinary Medicine (1999), 41(2-3), 75-88

The aim of this study was to demonstrate receiver-operating characteristic (ROC) methodology in the context of bovine intramammary infection (IMI). Quarter somatic cell scores (SCS) were available to ... [more ▼]

The aim of this study was to demonstrate receiver-operating characteristic (ROC) methodology in the context of bovine intramammary infection (IMI). Quarter somatic cell scores (SCS) were available to evaluate quarter IMI, and the final IMI diagnosis was made from milk bacteriologic cultures. Data consisted of 11,453 quarter-milk samples collected on 2084 clinically healthy cows located in 154 Belgian herds. Bacteriological analyses showed 16.2%, 7.2%, and 11.9% of quarters infected with coagulase-positive Staphylococcus spp., Streptococcus agalactiae, and coagulase-negative Staphylococcus spp., respectively. The ROC curve indicated all the combinations of sensitivity and specificity that quarter SCS was able to provide as a test to identify quarter IMI. Among parametric, semi-parametric, and non-parametric methods to estimate area under ROC curves, the parametric method seemed the least appropriate for analyzing SCS in this study. With the non-parametric method, the total area under the ROC curves showed quarter SCS could identify quarter IMI with an overall accuracy of 69%, 76%, and 59% for coagulase-positive Staphylococcus spp., S. agalactiae, and coagulase-negative Staphylococcus spp., respectively. Parametric and non-parametric statistical tests showed that overall SCS diagnostic capability was significantly (p<0.01) different from chance and was different (p<0.01) across the three bacteria. However, the SCS thresholds yielding the highest percentage of quarters correctly classified as infected (for the observed prevalence and for equal costs assigned to false-positive and false-negative results) were so high that they had no practical value. The major advantage of ROC analysis is the comprehensive description of the discrimination capacity of SCS for all possible choices of critical values. The major disadvantage is the dependency upon the gold standard used for the final diagnosis--but recent improvements of the methodology will correct the problem. [less ▲]

Detailed reference viewed: 12 (2 ULg)
Peer Reviewed
See detailAn imprinted QTL with major effect on muscle mass and fat deposition maps to the IgfII locus in pigs
Nezer, C.; Moreau, L.; Brouwers, B. et al

in Nature Genetics (1999), 21

Detailed reference viewed: 34 (12 ULg)
Peer Reviewed
See detailGenetic parameters estimation for spirometric performances in Belgian Blue calves
Bureau, Fabrice ULg; Fievez, Laurence ULg; Michaux, C. et al

in Proceedings: 17th Symposium of the Comparative Respiratory Society (1999)

Detailed reference viewed: 6 (0 ULg)
Peer Reviewed
See detailSpirometric performances in Belgian Blue calves, environmental factors analysis and genetic parameters estimation
Bureau, Fabrice ULg; Michaux, C.; Uystepruyst, Ch et al

in Proceedings: 50th Annual Meeting of the European Association for Animal Production (1999)

Detailed reference viewed: 8 (0 ULg)
Peer Reviewed
See detailRelationships between spirometric performances and occurrence and severity of respiratory disease in Belgian Blue calves
Bureau, Fabrice ULg; Fievez, Laurence ULg; Detilleux, J. et al

in Proceedings: 17th Symposium of the Comparative Respiratory Society (1999)

Detailed reference viewed: 4 (0 ULg)
Peer Reviewed
See detailMapping quantitative trait loci causing the muscular hypertrophy of Belgian Texel sheep
Marcq, Fabienne ULg; Elsen, J.-M.; Marot, V. et al

(1999)

Detailed reference viewed: 12 (0 ULg)
Peer Reviewed
See detailRésultats de l'amélioration génétique en race Azawak à la Station de Toukounous au Niger
Leroy, Pascal ULg; Chanono, M.; Maricaux, M.

(1999)

Detailed reference viewed: 41 (6 ULg)