The sex-linked dwarf gene in the broiler chicken industry

Mérat, P.

doi:10.1079/wps19840002

Cited by 16 publications

(7 citation statements)

References 33 publications

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“…Two Cyan-shank partridge lines possess meat flavor and appearance that are usually chosen by consumers. The Jingxing-Huang line is widely used in local breeding programs because of its dwarfism, feed-saving and space-saving characteristics [18]. The Cobb paternal line is a type of fast-growing line.…”

Section: Discussionmentioning

confidence: 99%

A new chicken 55K SNP genotyping array

et al. 2019

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Background China has the richest local chicken breeding resources in the world and is the world’s second largest producer of meat-type chickens. Development of a moderate-density SNP array for genetic analysis of chickens and breeding of meat-type chickens taking utility of those resources is urgently needed for conventional farms, breeding industry, and research areas. Results Eight representative local breeds or commercial broiler lines with 3 pools of 48 individuals within each breed/line were sequenced and supplied the major SNPs resource. There were 7.09 million - 9.41 million SNPs detected in each breed/line. After filtering using multiple criteria such as preferred incorporation of trait-related SNPs and uniformity of distribution across the genome, 52.18 K SNPs were selected in the final array. It consists of: (i) 19.22 K SNPs from the genomes of yellow-feathered, cyan-shank partridge and white-feathered chickens; (ii) 5.98 K SNPs related to economic traits from the Illumina 60 K SNP Bead Chip, which were found as significant associated SNPs with 15 traits in a Beijing-You crossed Cobb F2 resource population by genome-wide association study analysis; (iii) 7.63 K SNPs from 861 candidate genes of economic traits; (iv) the 0.94 K SNPs related to residual feed intake; and (v) 18.41 K from chicken SNPdb. The polymorphisms of 9 extra local breeds and 3 commercial lines were examined with this array, and 40 K - 47 K SNPs were polymorphic (with minor allele frequency > 0.05) in those breeds. The MDS result showed that those breeds can be clearly distinguished by this newly developed genotyping array. Conclusions We successfully developed a 55K genotyping array by using SNPs segregated from typical local breeds and commercial lines. Compared to the existing Affy 600 K and Illumina 60 K arrays, there were 21,41 K new SNPs included on our Affy 55K array. The results of the 55K genotyping data can therefore be imputed to high-density SNPs genotyping data. The array offers a wide range of potential applications such as genomic selection breeding, GWAS of interested traits, and investigation of diversity of different chicken breeds. Electronic supplementary material The online version of this article (10.1186/s12864-019-5736-8) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 99%

A new chicken 55K SNP genotyping array

et al. 2019

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“…A recessive gene for smaller body size in Bantam breeds (dw B ) was found by Godfrey (1953). The other gene, described by Hutt (1959), and known as the dwarfism (dw) gene resulted in a reduction of body weight, representing about 30-40% of the normal female weight, depending on age and genetic background, as reviewed by Mérat, 1984. During postnatal growth, the increase in skeletal muscle mass is mainly due to muscle fiber hypertrophy. This process is accompanied by the proliferating activity of satellite cells (Rehfeldt et al, 2000;Nierobisz and Mozdziak, 2008).…”

Section: Introductionmentioning

confidence: 99%

Effects of the Chicken Sex-linked Dwarf Gene on rowth and Muscle Development

Chen¹,

Chen²,

Tixier‐Boichard³

et al. 2009

Asian Australas. J. Anim. Sci

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The aim of this study was to analyze the effects on growth and muscle development during the growing period of the sex-linked dwarf gene in the background of a Taiwan Country chicken strain, L2, selected for egg production. Eight crossbred males, heterozygous for the DW*DW mutation, were each backcrossed to six females of the L2 strain to produce two genotypes of BC females, either normal (DW*N + /-) or dwarf (DW*DW/-). The experiment included 251 normal and 207 dwarf pullets. The effect of the dwarf gene on body weight and shank length was highly significant from 2 weeks of age. The reduction of body weight by the dwarf gene reached 34.8% and 37.4% as compared to normal sibs at 16 and 20 weeks of age, respectively. Parameters of the growth curve were estimated: the age at inflection (TI) was higher in normal pullets (66.9 days) than in dwarf pullets (61.2 days). A significant effect of the dwarf gene on single muscle fiber cross-section area was found from 12 weeks of age onwards, whereas the dwarf gene had no effect on the total number of muscle fibers. Comparing the effect of the dwarf gene on shank length at different ages revealed an earlier effect on skeleton growth, observed from 2 weeks of age, than on muscle development, which was affected from 8 to 12 weeks of age.

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“…Un autre exemple particulièrement emblématique est celui de l'utilisation du gène de nanisme (dw pour dwarf) chez la poule (Mérat 1984). Ce gène, lié au sexe, est présent sur le chromosome Z dont les femelles ne portent qu'une seule copie, le déterminisme du sexe étant du type ZW chez la poule.…”

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Contraintes et opportunités d’organisation de la sélection dans les filières porcine et avicole

Coudurier¹

2011

INRA Prod. Anim.

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L’organisation des schémas de sélection découle des particularités biologiques (prolificité, intervalle de générations…) propres àchaque espèce ou groupe d’espèces, ainsi que de la nature des caractères d’intérêt (précoces, tardifs…). Dans les filières porcine etavicole, où la diffusion des reproducteurs est largement mondialisée, la concurrence entre opérateurs induit une course au progrèsgénétique impliquant de maximiser l’efficacité de la sélection dans les races ou lignées pures, ainsi que de profiter des différents avantagesdu croisement (hétérosis, complémentarité entre populations, utilisation de gènes majeurs) dans les limites permises par le tauxde reproduction élevé de ces espèces. La mise en oeuvre de ces principes conduit à des modalités d’organisation des schémas de sélectionet de croisement de type pyramidal, caractéristique de ces filières. Elles exercent en retour un effet structurant sur les opérateursgénétiques eux-mêmes, conduisant à une typologie caractéristique, modulée par certaines particularités biologiques des animaux (format...),par la segmentation du marché des produits commerciaux dans la filière avicole (espèces, marchés de niche…), et par l’importancerelative du secteur privé (partielle en filière porcine, totale en filière avicole). L’arrivée de la sélection génomique ne devraitpas bouleverser cette typologie, mais pose des problèmes de faisabilité économique.

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The sex-linked dwarf gene in the broiler chicken industry

Cited by 16 publications

References 33 publications

A new chicken 55K SNP genotyping array

A new chicken 55K SNP genotyping array

Effects of the Chicken Sex-linked Dwarf Gene on rowth and Muscle Development

Contraintes et opportunités d’organisation de la sélection dans les filières porcine et avicole

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