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Genotype by environment interactions in relation to growth traits in slow growing chickens
N'Dri Aya,Sellier Nadine,Tixier-Boichard Michèle,Beaumont Catherine
Genetics Selection Evolution , 2007, DOI: 10.1186/1297-9686-39-5-513
Abstract: Since feed conversion ratio (FCR) is higher in slow-growing "Label Rouge" chickens than in broiler chickens, it is important to work on its improvement in this breed. However, this involves rearing animals in cages (C), an environment very different from that used for selection (in floor pens, S) and production (outdoor, E). The aim of this study was to evaluate the importance of genotype by environment (G × E) interactions between S, C, and E environments, to find the best way to select for FCR, using 2002 related animals. Growth curve parameters were estimated and body composition measured. Individual feed conversion ratios (FCR) were recorded between 8 and 10 weeks in C. The presence of G × E interactions was assessed by the genetic correlations between the same trait recorded in different environments. Moderate but significant G × E interactions were detected for carcass traits, a significant one was observed between E and S or C for growth curve parameters but none between C and S. If G × E interactions are set aside, i.e. selecting on traits recorded in C, abdominal fatness is the best indirect selection criterion for FCR but if they are taken in account then leg yield or growth curve parameters in S and growth curve parameters in E are better.
Les bases du croisement chez le porc
P Sellier
Genetics Selection Evolution , 1976, DOI: 10.1186/1297-9686-8-2-296b
Hétérosis et croisement chez le porc
P Sellier
Genetics Selection Evolution , 1970, DOI: 10.1186/1297-9686-2-2-145
Identification of memory kernels in thermo-viscoelasticity
M. Sellier
Physics , 2005,
Abstract: This paper discusses the possibility of identifying the shear and structure relaxation kernels in glassy materials by means of a single, simple and non-intrusive experiment. The material should be thermorheologically simple and the kernels expressed in the form of Prony series. The experiment considered consists in measuring the thickness variations over time of a flat sample cooled symmetrically from both side from a temperature above the glass transition temperature down to room temperature. The comparison of experimental observations with theoretically calculated responses allows the identification of the coefficients of the Prony series for the shear and structure relaxation kernels using a least-square type method. This paper illustrates the success of the method with `artificially' created experimental observations and with up to two exponential terms in the Prony series for the shear and structure relaxation kernels.
An unconditionally convergent iterative scheme for initial shape identification in small deformations
M. Sellier
Mathematics , 2004,
Abstract: The question of interest in the present study is: ``Given a body subject to mechanical loads, how to define the initial geometry so that the deformed one matches precisely a prescribed shape?'' This question is particularly relevant in forming processes where the tolerated mismatch between the deformed and desired geometries may be lower than a Micron. The method proposed here uses as a first ``guess'' to the required initial geometry the desired one, then it updates iteratively the locations of a set of boundary points so that their locations in the deformed configuration come closer and closer to the desired ones. The scheme is shown to converge unconditionally for small deformations in the sense that arbitrarily small mismatch between the deformed and desired shape can be achieved. Moreover, since it is based entirely on geometric considerations, the convergence should not be affected by the nature of material, i.e. it is independent of the constitutive law. The success of the method is illustrated by considering an example.
Chicken meat quality: genetic variability and relationship with growth and muscle characteristics
Elisabeth Le Bihan-Duval, Martine Debut, Cécile M Berri, Nadine Sellier, Véronique Santé-Lhoutellier, Yves Jégo, Catherine Beaumont
BMC Genetics , 2008, DOI: 10.1186/1471-2156-9-53
Abstract: Significant levels of heritability (averaging 0.3) were obtained for breast meat quality traits such as pH at 15 min post-slaughter, ultimate pH (pHu), color assessed by lightness L*, redness a* and yellowness b*, drip loss, thawing-cooking loss and shear-force. The rate of decrease in pH early post-mortem and the final pH of the meat were shown to be key factors of chicken meat quality. In particular, a decrease in the final pH led to paler, more exudative and tougher breast meat. The level of glycogen stored in breast muscle estimated by the Glycolytic Potential (GP) at slaughter time was shown to be highly heritable (h2 0.43). There was a very strong negative genetic correlation (rg) with ultimate meat pH (rg -0.97), suggesting a common genetic control for GP and pHu. While breast muscle weight was genetically positively correlated with fiber size (rg 0.76), it was negatively correlated with the level of glycogen stored in the muscle (rg -0.58), and as a consequence it was positively correlated with the final pH of the meat (rg 0.84).This genetic study confirmed that selection should be useful to improve meat characteristics of meat-type chickens without impairing profitability because no genetic conflict was detected between meat quality and meat quantity. Moreover, the results suggested relevant selection criteria such as ultimate pH, which is strongly related to color, water-holding capacity and texture of the meat in this heavy chicken line.As in other animal species, the technological quality of poultry meat is now of major importance, since poultry meat is nowadays usually consumed as cuts or as processed products rather than as whole carcasses. As already reported for pigs [1], technological quality refers to several meat properties, including water-holding capacity (i.e. drip loss during storage), intensity and homogeneity of color, firmness, shelf-life and processing yields. Meat quality is closely related to the decrease in muscle pH post-mortem. Rapid
A Direct Solution Approach to the Inverse Shallow-Water Problem
Alelign Gessese,Mathieu Sellier
Mathematical Problems in Engineering , 2012, DOI: 10.1155/2012/417950
Abstract: The study of open channel flow modelling often requires an accurate representation of the channel bed topography to accurately predict the flow hydrodynamics. Experimental techniques are the most widely used approaches to measure the bed topographic elevation of open channels. However, they are usually cost and time consuming. Free surface measurement is, on the other hand, relatively easy to obtain using airborne photographic techniques. We present in this work an easy to implement and fast to solve numerical technique to identify the underlying bedrock topography from given free surface elevation data in shallow open channel flows. The main underlying idea is to derive explicit partial differential equations which govern this inverse reconstruction problem. The technique described here is a “one-shot technique” in the sense that the solution of the partial differential equation provides the solution to the inverse problem directly. The idea is tested on a set of artificial data obtained by first solving the forward problem governed by the shallow-water equations. Numerical results show that the channel bed topographic elevation can be reconstructed with a level of accuracy less than 3%. The method is also shown to be robust when noise is present in the input data.
étude du taux d'hydroxyproline d'un muscle et de ses relations avec certaines caractéristiques de composition corporelle dans les races large white et pietrain
P Sellier, R Boccard
Genetics Selection Evolution , 1972, DOI: 10.1186/1297-9686-4-1-125
Développement musculaire et taux d'hydroxyproline du muscle dans les races porcines large-white et pietrain
P Sellier, R Boccard
Genetics Selection Evolution , 1969, DOI: 10.1186/1297-9686-1-2-179
Pig genetics: a review
L Ollivier, P Sellier
Genetics Selection Evolution , 1982, DOI: 10.1186/1297-9686-14-4-481
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