References of "Leroy, Pascal"
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See detailSpirometric performance in Belgian Blue calves: II. Analysis of environmental factors and estimation of genetic parameters.
Bureau, Fabrice ULg; Michaux, C.; Coghe, J. et al

in Journal of Animal Science (2001), 79(5), 1162-1165

Genetic parameters and environmental effects for spirometric variables (SV) in calves were estimated using 734 Belgian Blue calves (15 to 297 d of age), sired by 20 AI bulls. For each calf, the following ... [more ▼]

Genetic parameters and environmental effects for spirometric variables (SV) in calves were estimated using 734 Belgian Blue calves (15 to 297 d of age), sired by 20 AI bulls. For each calf, the following SV were measured: 1) the average ventilation (l/min) recorded during the 15 s of maximal ventilatory changes induced by lobeline administration (0.25 mg/kg, i.v.) (15-s MV(L)); 2) the vital capacity, and the maximal peak expiratory and inspiratory flows recorded after lobeline administration; and 3) the ventilatory reserve (15-s MV(L) - ventilation at rest). Analysis of environmental factors showed age of calf, herd, sex, and vaccination status had significant effects on SV. A sire model and a multiple-trait derivative-free REML procedure were used to estimate genetic parameters for SV, body weight, and muscling score. Heritabilities for SV ranged from 0.28 +/- 0.11 to 0.44 +/- 0.16. Genetic correlations among SV varied from 0.76 to 0.98 and environmental correlations from 0.69 to 0.80. Genetic correlations of SV with body weight (0.25 to 0.56) and with muscling score (0.21 to 0.76) were positive, as were environmental correlations of SV with body weight (0.44 to 0.70) and muscling score (0.09 to 0.25). These results suggest that selection may improve SV without impairing other traits of economic importance. [less ▲]

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See detailLa capacité ventilatoire des veaux Blanc-Bleu Belges : relation avec la résistance aux pathologies respiratoires
Jacqmot, Olivier ULg; Bureau, Fabrice ULg; Dorts, T. et al

in Sixième Carrefour des Productions Animales : La Sélection Animale au Service de la Société (2001)

Les performances spirométriques ont un effet sur la morbidité, la mortalité et le coût des maladies respiratoires dans l'espèce bovine. Les veaux Blanc-Bleu Belge se distinguant des autres par de ... [more ▼]

Les performances spirométriques ont un effet sur la morbidité, la mortalité et le coût des maladies respiratoires dans l'espèce bovine. Les veaux Blanc-Bleu Belge se distinguant des autres par de meilleures performances spirométriques sont avantagés du point de vue fonctionnel respiratoire; ils sont plus résistants aux pathologies respiratoires. Parmi les variables, ce sont la capacité ventilatoire et la ventilation maximale qui sont les plus importantes pour améliorer la résistance aux maladies respiratoires. Ces variables sont héritables et cela sans diminution du gain de poids ni du développement musculaire de ces animaux [less ▲]

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See detailLes attentes des consommateurs, des nouveaux critères de sélection porcine
Leroy, Pascal ULg; Verleyen, Vincent ULg; Beduin, J.-M. et al

in Carrefour des productions animales, Gembloux 2001 (2001)

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See detailLes nouveaux critères de sélection porcine
Leroy, Pascal ULg

in Carrefour des Productions animales Gembloux (2001)

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See detailLes attentes des consommateurs, des nouveaux critères de sélection porcine
Leroy, Pascal ULg; Beduin, Jean-Marie; Verleyen, Vincent ULg et al

in Sixième Carrefour des productions animales "La sélection animale au service de la Société" (2000)

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See detailMapping QTL influencing muscularity in a Texel x Romanov intercross
Marcq, Fabienne ULg; Elsen, J.-M.; Marot, V. et al

(2000)

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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)

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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 ▲]

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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

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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)

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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)

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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)

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See detailMapping quantitative trait loci causing the muscular hypertrophy of Belgian Texel sheep
Marcq, Fabienne ULg; Elsen, J.-M.; Marot, V. et al

(1999)

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