References of "Colinet, Frédéric"
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See detailLes élevages Bleue Mixte et leur rentabilité au travers du projet franco-belge BlueSel
Glorieux, Géry; Beguin, E.; Desert Gouwy, H. et al

in 17ièmes Rencontres Recherches Ruminants, Paris, les 8 et 9 Décembre 2010 (2010, December)

La « Bleue Mixte » (BM) est une race à petit effectif localisée de part et d’autre de la frontière franco-belge. Menacée de disparition, elle bénéficie d’un projet transfrontalier BlueSel soutenu par le ... [more ▼]

La « Bleue Mixte » (BM) est une race à petit effectif localisée de part et d’autre de la frontière franco-belge. Menacée de disparition, elle bénéficie d’un projet transfrontalier BlueSel soutenu par le programme européen INTERREG IV et les autorités françaises et wallonnes. L’objectif de ce projet est d’assurer la conservation, la sélection et la promotion de la BM. L’un des volets du programme consiste à étudier la rentabilité économique des troupeaux BM. Il s’appuie sur un réseau de 16 fermes de référence mis en place fin 2008. La collecte des résultats repose sur la méthodologie mise en oeuvre au sein du dispositif français des Réseaux d’élevage. Les exploitations BM sont regroupées selon deux systèmes, herbivore et polyculture-élevage, et comparées aux exploitations laitières Prim’Holstein (PH) du Réseau d’élevage de Nord-Picardie. Les premiers résultats démontrent la capacité des éleveurs de vaches BM à obtenir de bonnes performances économiques malgré une faible productivité laitière (4200 l/VL/an) et un moindre prix du lait. En système herbivore, les exploitations BM s’avèrent économes et autonomes avec une excellente valorisation des prairies. En système de polyculture-élevage, les troupeaux sont conduits de façon à peine plus intensive qu’en système herbivore contrairement aux troupeaux PH. L’étude du fonctionnement des troupeaux BM va se poursuivre dans le cadre du projet BlueSel pour approfondir les logiques de fonctionnement très spécifiques de ces troupeaux et pour mesurer l’impact de la race sur les temps de travaux. [less ▲]

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See detailLongitudinal effects of muscular hypertrophy allele on milk production traits during the lactation using a novel equivalent model when molecular information is limited
Colinet, Frédéric ULg; Gengler, Nicolas ULg

Conference (2010, August)

Given that the mh allele causes the double muscling phenotype, this allele could also influence milk production traits of the dual purpose Belgian Blue cattle. However, all dual purpose Belgian Blue ... [more ▼]

Given that the mh allele causes the double muscling phenotype, this allele could also influence milk production traits of the dual purpose Belgian Blue cattle. However, all dual purpose Belgian Blue animals could not be genotyped. So, a new alternative strategy for the prediction of gene effects and especially their smooth integration into genetic evaluations based on an equivalent method was developed from existing theory. Developed equations were modified to allow that not all animals were genotyped. As expected, the mh allele had negative effects on milk production traits. For the first three lactations, the average estimated allelic substitution effects were -0.074 % fat content and -158.7 kg milk per lactation (305 days). Moreover, effects of mh allele were not constant during the lactation. [less ▲]

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See detailLongitudinal effects of muscular hypertrophy allele on milk production traits during the lactation using a novel equivalent model when molecular information is limited
Colinet, Frédéric ULg; Gengler, Nicolas ULg

in Proceedings of the 9th World Congress on Genetics Applied to Livestock Production (2010, August)

Given that the mh allele causes the double muscling phenotype, this allele could also influence milk production traits of the dual purpose Belgian Blue cattle. However, all dual purpose Belgian Blue ... [more ▼]

Given that the mh allele causes the double muscling phenotype, this allele could also influence milk production traits of the dual purpose Belgian Blue cattle. However, all dual purpose Belgian Blue animals could not be genotyped. So, a new alternative strategy for the prediction of gene effects and especially their smooth integration into genetic evaluations based on an equivalent method was developed from existing theory. Developed equations were modified to allow that not all animals were genotyped. As expected, the mh allele had negative effects on milk production traits. For the first three lactations, the average estimated allelic substitution effects were -0.074 % fat content and -158.7 kg milk per lactation (305 days). Moreover, effects of mh allele were not constant during the lactation. [less ▲]

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See detailPotential estimation of titratable acidity in cow milk using mid-infrared spectrometry
Colinet, Frédéric ULg; Soyeurt, Hélène ULg; Anceau, Christine ULg et al

Conference (2010, June)

Milk coagulation has a direct effect on cheese yield. Several factors influence the milk coagulation kinetics. In addition to calcium and milk protein concentrations, titratable acidity influences all the ... [more ▼]

Milk coagulation has a direct effect on cheese yield. Several factors influence the milk coagulation kinetics. In addition to calcium and milk protein concentrations, titratable acidity influences all the phases of milk coagulation. The objective of this research was to study the feasibility of prediction of titratable acidity directly in bovine milk using mid-infrared spectrometry. In order to maximize the variability in the measurements of titratable acidity, milk samples were collected on basis of several criteria (e.g. breeds). The titratable acidity was recorded as Dornic degree. All samples were also analyzed by MIR spectrometry. Using partial least squares regressions and first derivative pretreatment of spectral data, a calibration equation was built to predict the Dornic degree in cow milk. First results were promising and showed the potentiality to this calibration. The calibration and cross-validation coefficients of determination were 92.25 and 89.88 %, respectively. Moreover, the ratio of standard error of prediction to standard deviation was 3.13 and permits us to consider the calibration equation as usable in most application such as scientific researches and the screening of the Walloon dairy herd particularly in order to improve the milk coagulation properties. [less ▲]

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See detailPotential estimation of titratable acidity in cow milk using mid-infrared spectrometry
Colinet, Frédéric ULg; Soyeurt, Hélène ULg; Anceau, Christine ULg et al

in ICAR Technical Series (2010), 14

Milk coagulation has a direct effect on cheese yield. Several factors influence the milk coagulation kinetics. In addition to calcium and milk protein concentrations, titratable acidity influences all the ... [more ▼]

Milk coagulation has a direct effect on cheese yield. Several factors influence the milk coagulation kinetics. In addition to calcium and milk protein concentrations, titratable acidity influences all the phases of milk coagulation. The objective of this research was to study the feasibility of prediction of titratable acidity directly in bovine milk using mid-infrared spectrometry. In order to maximize the variability in the measurements of titratable acidity, milk samples were collected on basis of several criteria (e.g. breeds). The titratable acidity was recorded as Dornic degree. All samples were also analyzed by MIR spectrometry. Using partial least squares regressions and first derivative pretreatment of spectral data, a calibration equation was built to predict the Dornic degree in cow milk. First results were promising and showed the potentiality to this calibration. The calibration and cross-validation coefficients of determination were 92.25 and 89.88 %, respectively. Moreover, the ratio of standard error of prediction to standard deviation was 3.13 and permits us to consider the calibration equation as usable in most application such as scientific researches and the screening of the Walloon dairy herd particularly in order to improve the milk coagulation properties. [less ▲]

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See detailMotives and values in farming local cattle breeds in Europe: a survey on 15 breeds
Gandini, G.; Avon, L.; Bohte-Wilhelmus, D. et al

in Animal Genetic Resources (2010), 47

Within the EURECA project (Towards self-sustainable EUropean REgional CAttle breeds), we interviewed a total of 371 farmers of 15 local cattle breeds in eight European countries. Besides collecting data ... [more ▼]

Within the EURECA project (Towards self-sustainable EUropean REgional CAttle breeds), we interviewed a total of 371 farmers of 15 local cattle breeds in eight European countries. Besides collecting data on farmers, land use, herd composition and economic role of cattle, we aimed at understanding farmers’ motives and values in keeping local cattle. The most frequent first reason to keep the local breed was productivity, followed by tradition. When comparing the local breed with a mainstream breed, only in four breeds was productivity considered the same, while in three breeds more than 50 percent of farmers valued the local breed as more profitable. The local breed was valued as always superior or the same on functional traits. Farmers were asked which type of appreciation they thought representatives of various stakeholders had on their local breed: a positive appreciation was observed in 33 percent of farmers. On average across breeds, 39 percent of farmers expect to increase the size of their herd in the next few years and 5 percent plan to give up farming. The degree of dependence of farmers on economic incentives was estimated by asking farmers their expected behaviour under three scenarios of change of subsidies. Most farmers demanded activities for promoting local breed farming. The results are discussed in terms of breed sustainability and conservation. [less ▲]

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See detailThe dual purpose Red and White
Colinet, Frédéric ULg

Diverse speeche and writing (2010)

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See detailLa Pie Rouge mixte
Colinet, Frédéric ULg

Diverse speeche and writing (2010)

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See detailThe dual purpose Belgian Blue
Colinet, Frédéric ULg

Diverse speeche and writing (2010)

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See detailLa Blanc-Bleu Belge de type mixte
Colinet, Frédéric ULg

Diverse speeche and writing (2010)

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See detailLe Blanc-Bleu Belge de type mixte à l'heure de la génomique
Colinet, Frédéric ULg

Article for general public (2010)

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See detailEffect of bovine colostrum on the serum insulin-like growth factor-I (IGF-I), the IGF binding proteins-2 and -3 and the thyroid hormones in weaning piglets
Boudry, Christelle ULg; Dehoux, Jean-Paul; Colinet, Frédéric ULg et al

in Archiv Tierzucht (2010), 53(6), 675-688

This study examined the effect of a bovine colostrum supplementation on growth performance, feed intake and the hormonal response of piglets at weaning. Ninety-six newly-weaned piglets were assigned for ... [more ▼]

This study examined the effect of a bovine colostrum supplementation on growth performance, feed intake and the hormonal response of piglets at weaning. Ninety-six newly-weaned piglets were assigned for four weeks to one of the two treatments: Control (diet with bovine milk whey) and Colostrum (diet with bovine colostrum whey) treatments. The supplements were incorporated in a commercial diet at 20 g/kg during the first 2 weeks after weaning and lowered to 10 g/kg for the next 2 weeks. Body weight and feed intake were measured weekly. Blood samples were taken weekly for determination of circulating IGF-I, its binding proteins and the thyroid hormones (T3 and T4). During the first week of the trial, the Colostrum-fed piglets presented improved growth performance, feed intake and feed efficiency and a higher concentration in circulating IGF-I (+ 15 %) compared to the Control piglets. In both treatments, the circulating thyroid hormones were reduced by weaning and the levels measured at weaning were recovered earlier by the Colostrum-fed piglets compared to the Control group (P < 0.05). It is concluded that hormonal response observed after the bovine colostrum supplementation is, at least in part, consequent of the positive action of bovine colostrum on the feed intake. [less ▲]

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See detailEstimation des effets du gène culard sur les caractères de production laitière au sein du rameau Blanc Bleu Belge de type mixte
Colinet, Frédéric ULg; Gengler, Nicolas ULg

Poster (2009, December)

Le rameau Blanc Bleu Belge de type mixte (BBm) est apprécié pour sa rusticité, sa longévité, une bonne santé ainsi que pour ses bonnes performances de reproduction. Une délétion de 11 paires de base ... [more ▼]

Le rameau Blanc Bleu Belge de type mixte (BBm) est apprécié pour sa rusticité, sa longévité, une bonne santé ainsi que pour ses bonnes performances de reproduction. Une délétion de 11 paires de base (allèle mh) au sein du gène de la myostatine engendre le syndrome d’hypertrophie musculaire (plus connu sous le nom de type culard ; d’ailleurs, cet allèle mh est souvent appelé le gène culard). Bien que cet allèle mh soit très présent au sein du rameau Blanc Bleu Belge de type viandeux, seulement 41 et 39 % des animaux BBm sont respectivement mh/mh et mh/+. Etant donné l’importance des effets du gène culard sur la conformation viandeuse des animaux et de son rôle potentiel indirect en production laitière, il nous a semblé intéressant de tenir compte de sa présence lors de l’évaluation génétique des animaux BBm. Néanmoins, il n’est pas envisageable et concevable de génotyper tous les individus de la population BBm. Dès lors, il a fallu modifier légèrement le modèle mixte utilisé pour pouvoir y incorporer ce génotype connu pour certains animaux. La méthodologie ici présentée permet l’estimation simultanée des effets polygéniques (plus connus sous le terme « valeur d’élevage », VE) et de l’effet du gène culard. [less ▲]

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See detailEstimation des effets du gène culard sur les caractères de production laitière au sein du rameau Blanc Bleu Belge de type mixte
Colinet, Frédéric ULg; Gengler, Nicolas ULg

in 16ièmes Rencontres Recherches Ruminants, Paris, les 2 et 3 Décembre 2009 (2009, December)

Le rameau Blanc Bleu Belge de type mixte (BBm) est apprécié pour sa rusticité, sa longévité, une bonne santé ainsi que pour ses bonnes performances de reproduction. Une délétion de 11 paires de base ... [more ▼]

Le rameau Blanc Bleu Belge de type mixte (BBm) est apprécié pour sa rusticité, sa longévité, une bonne santé ainsi que pour ses bonnes performances de reproduction. Une délétion de 11 paires de base (allèle mh) au sein du gène de la myostatine engendre le syndrome d’hypertrophie musculaire (plus connu sous le nom de type culard ; d’ailleurs, cet allèle mh est souvent appelé le gène culard). Bien que cet allèle mh soit très présent au sein du rameau Blanc Bleu Belge de type viandeux, seulement 41 et 39 % des animaux BBm sont respectivement mh/mh et mh/+. Etant donné l’importance des effets du gène culard sur la conformation viandeuse des animaux et de son rôle potentiel indirect en production laitière, il nous a semblé intéressant de tenir compte de sa présence lors de l’évaluation génétique des animaux BBm. Néanmoins, il n’est pas envisageable et concevable de génotyper tous les individus de la population BBm. Dès lors, il a fallu modifier légèrement le modèle mixte utilisé pour pouvoir y incorporer ce génotype connu pour certains animaux. La méthodologie ici présentée permet l’estimation simultanée des effets polygéniques (plus connus sous le terme « valeur d’élevage », VE) et de l’effet du gène culard. [less ▲]

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See detailGenetic evaluation considering phenotypic data and limited molecular information using a novel equivalent model: Case study using effect of the mh locus on milk production in the dual-purpose Belgian Blue breed
Colinet, Frédéric ULg; Gengler, Nicolas ULg

Conference (2009, August)

The introduction of molecular information into genetic evaluation systems is currently under research. Based on an equivalent method, we developed from existing theory a new alternative strategy for the ... [more ▼]

The introduction of molecular information into genetic evaluation systems is currently under research. Based on an equivalent method, we developed from existing theory a new alternative strategy for the prediction of gene effects and especially their smooth integration into genetic evaluations. Underlying hypothesis were based on the idea that knowledge of genotypes will not affect overall additive genetic variance but only change expected values of genetic effects for animals with known genotypes. However, all animals could not be genotyped. Thus, the developed equations were modified to allow the integration of the known genotype for a portion of the population. This strategy was tested for the mh locus (responsible for the double-muscling phenotype) in dual-purpose Belgian Blue cattle. The genotype was determined for 123 bulls and 1940 cows (+/+ 19.5, mh/+ 39.3 and mh/mh 41.2%). These animals had 11,150 daughters with test-day (TD) records. The genotypes were incorporated into a modified genetic evaluation based on the current routine multi-trait multibreed test-day model used in the Walloon Region (Belgium). Data used included 12,829,309 TD records for 689,057 dairy cows in production. The pedigree file contained 1,606,024 animals (cows with TD records and ancestors). Computation of the modified mixed model equations was done solving iteratively two systems of equations, one for the polygenic effects and one for the gene effect until the relative differences in the gene solutions were below 10-5. A linear extrapolation was also used to speed up the convergence of gene effects. As expected, the mh locus exerts negative effects on milk production traits. For the first three lactations, the average estimated allelic substitution effects were -158.7 kg milk, -8.93 kg fat and -5.64 kg protein per lactation (305 days). [less ▲]

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See detailGenetic evaluation considering phenotypic data and limited molecular information using a novel equivalent model: Case study using effect of the mh locus on milk production in the dual-purpose Belgian Blue breed
Colinet, Frédéric ULg; Gengler, Nicolas ULg

in Book of Abstracts of the 60th Annual Meeting of the European Association for Animal Production (2009, August)

The introduction of molecular information into genetic evaluation systems is currently under research. Based on an equivalent method, we developed from existing theory a new alternative strategy for the ... [more ▼]

The introduction of molecular information into genetic evaluation systems is currently under research. Based on an equivalent method, we developed from existing theory a new alternative strategy for the prediction of gene effects and especially their smooth integration into genetic evaluations. Underlying hypothesis were based on the idea that knowledge of genotypes will not affect overall additive genetic variance but only change expected values of genetic effects for animals with known genotypes. However, all animals could not be genotyped. Thus, the developed equations were modified to allow the integration of the known genotype for a portion of the population. This strategy was tested for the mh locus (responsible for the double-muscling phenotype) in dual-purpose Belgian Blue cattle. The genotype was determined for 123 bulls and 1940 cows (+/+ 19.5, mh/+ 39.3 and mh/mh 41.2%). These animals had 11,150 daughters with test-day (TD) records. The genotypes were incorporated into a modified genetic evaluation based on the current routine multi-trait multibreed test-day model used in the Walloon Region (Belgium). Data used included 12,829,309 TD records for 689,057 dairy cows in production. The pedigree file contained 1,606,024 animals (cows with TD records and ancestors). Computation of the modified mixed model equations was done solving iteratively two systems of equations, one for the polygenic effects and one for the gene effect until the relative differences in the gene solutions were below 10-5. A linear extrapolation was also used to speed up the convergence of gene effects. As expected, the mh locus exerts negative effects on milk production traits. For the first three lactations, the average estimated allelic substitution effects were -158.7 kg milk, -8.93 kg fat and -5.64 kg protein per lactation (305 days). [less ▲]

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See detailBLUESEL - an INTERREG France-Wallonie-Vlaanderen project aiming at the conservation and the use of the genetic heritage of the dual-purpose Blue Breeds in Belgium and Northern France
Colinet, Frédéric ULg

Poster (2009, August)

Dual-purpose Belgian Blue and North Blue cattle are mainly located on both sides of the border between France and Belgium. Even if these Belgian and French Blue breeds are related because of their common ... [more ▼]

Dual-purpose Belgian Blue and North Blue cattle are mainly located on both sides of the border between France and Belgium. Even if these Belgian and French Blue breeds are related because of their common ancestors in the former Mid and High Belgium cattle, these breeds diverged slightly under differentiated selection objectives in both countries. Within the BLUESEL project, a first aim consists to create a working group cross-border which will develop common guidelines for selection of bull dams and elite-matings for this dual-purpose Blue Breeds. This working group will create and help to conserve a common pool of bulls available for breeding in both countries. The project will also develop tools to harmonize the collection of phenotypic data (milk production and morphology). A joint genetic evaluation for production traits will be developed, adapted to the specifities of these breeds and integrating data provided by both countries. Others objectives of BLUESEL are the implementation of a technical and economical guidance of these farms and the improvement of profitability of farms through advice on management and on improvement of livestock. The valorisation of these breeds through the development of new and specific products (e.g. cheese products) is another objective. In summary, the whole project should contribute maintaining biodiversity in this cross-border region through conservation and use of animals naturally adapted. The BLUESEL project was launched in July 2008. It is conceived for four years and is supported by the European Union, the Walloon Region, the Nord-Pas-de Calais Region and the General Council of Department of Nord. [less ▲]

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See detailBLUESEL - an INTERREG France-Wallonie-Vlaanderen project aiming at the conservation and the use of the genetic heritage of the dual-purpose Blue Breeds in Belgium and Northern France
Colinet, Frédéric ULg

in Book of Abstracts of the 60th Annual Meeting of the European Association for Animal Production (2009, August)

Dual-purpose Belgian Blue and North Blue cattle are mainly located on both sides of the border between France and Belgium. Even if these Belgian and French Blue breeds are related because of their common ... [more ▼]

Dual-purpose Belgian Blue and North Blue cattle are mainly located on both sides of the border between France and Belgium. Even if these Belgian and French Blue breeds are related because of their common ancestors in the former Mid and High Belgium cattle, these breeds diverged slightly under differentiated selection objectives in both countries. Within the BLUESEL project, a first aim consists to create a working group cross-border which will develop common guidelines for selection of bull dams and elite-matings for this dual-purpose Blue Breeds. This working group will create and help to conserve a common pool of bulls available for breeding in both countries. The project will also develop tools to harmonize the collection of phenotypic data (milk production and morphology). A joint genetic evaluation for production traits will be developed, adapted to the specifities of these breeds and integrating data provided by both countries. Others objectives of BLUESEL are the implementation of a technical and economical guidance of these farms and the improvement of profitability of farms through advice on management and on improvement of livestock. The valorisation of these breeds through the development of new and specific products (e.g. cheese products) is another objective. In summary, the whole project should contribute maintaining biodiversity in this cross-border region through conservation and use of animals naturally adapted. The BLUESEL project was launched in July 2008. It is conceived for four years and is supported by the European Union, the Walloon Region, the Nord-Pas-de Calais Region and the General Council of Department of Nord. [less ▲]

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See detailEquivalent mixed model for joint genetic evaluation considering molecular and phenotypic information
Gengler, Nicolas ULg; Colinet, Frédéric ULg

Conference (2009, July)

Currently efforts are underway to introduce molecular information into genetic evaluation systems. A particular situation is genomic selection however simpler cases exists where major genes are known and ... [more ▼]

Currently efforts are underway to introduce molecular information into genetic evaluation systems. A particular situation is genomic selection however simpler cases exists where major genes are known and used by breeders. A new alternative strategy for the prediction of gene effects and especially their smooth integration into genetic evaluations based on an equivalent method was developed from existing theory. Underlying hypothesis were based on the idea that knowledge of genotypes will not affect overall additive genetic variance but only change expected values of genetic effects for animals with known genotypes. The developed equations were modified to allow that not all animals were genotyped. As the underlying mixed model is open a very large range of models can be used in situations including random regression models, multipletrait, maternal effects and multiple-across-country-evaluation models. Computations involved successive solving of two mixed models, with the use of an linear extrapolation to speed up convergence of gene effects. The method was tested for several known major genes and QTL, e.g. for the mh gene in the dual-purpose Belgian Blue population in Belgium. Modifications of the method could also be developed to be useful in the context of genomic selection. [less ▲]

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