2 resultados para Apical infiltration


Relevância:

20.00% 20.00%

Publicador:

Resumo:

Pour realiser un bon diagnostic des risques de ruissellement et d'erosion sur un versant, il convient d'observer le fonctionnement hydrique du terrain au cours de la saison des pluies on au moins de tester la capacite d'infiltration des sols soumis a diverses utilisations. Dans cette note est decrit un test au cylindre unique, test simple et peu couteux permettant non seulement de classer les horizons d'un sol en fonction de leur capacite d'infiltration, de leur porosite discussion porte sur l'interet et les limites de cette methode. Deux exemples mountret l'interet pratique de ce test de terrain sur des sols ferrallitiques argileux du Bresil et sur un sol ferrugineux tropical sableux du Cameroun.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Abstract: Selection among broilers for performance traits is resulting in locomotion problems and bone disorders, once skeletal structure is not strong enough to support body weight in broilers with high growth rates. In this study, genetic parameters were estimated for body weight at 42 days of age (BW42), and tibia traits (length, width, and weight) in a population of broiler chickens. Quantitative trait loci (QTL) were identified for tibia traits to expand our knowledge of the genetic architecture of the broiler population. Genetic correlations ranged from 0.56 +/- 0.18 (between tibia length and BW42) to 0.89 +/- 0.06 (between tibia width and weight), suggesting that these traits are either controlled by pleiotropic genes or by genes that are in linkage disequilibrium. For QTL mapping, the genome was scanned with 127 microsatellites, representing a coverage of 2630 cM. Eight QTL were mapped on Gallus gallus chromosomes (GGA): GGA1, GGA4, GGA6, GGA13, and GGA24. The QTL regions for tibia length and weight were mapped on GGA1, between LEI0079 and MCW145 markers. The gene DACH1 is located in this region; this gene acts to form the apical ectodermal ridge, responsible for limb development. Body weight at 42 days of age was included in the model as a covariate for selection effect of bone traits. Two QTL were found for tibia weight on GGA2 and GGA4, and one for tibia width on GGA3. Information originating from these QTL will assist in the search for candidate genes for these bone traits in future studies.