Gène Cou nu, performances de ponte et efficacité alimentaire selon la température chez la poule

Bordas, A.; Monnet, LE; Mérat, P.; Dumortier, M

doi:10.1186/1297-9686-12-4-343

Cited by 9 publications

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“…The presence of these birds in middle altitude regions of Sikkim may indicate its ability to adapt to moderately cold conditions. The results of Banerjee and Banerjee (2000) indicated that the dressing percentage of the naked neck chickens was higher than the feathered chickens; similar observations were also obtained by Bordas, Monnet and Mérat (1980), Mérat (1990) and Deeb and Cahaner (1994). The results of Banerjee and Banerjee (2000) indicated that the dressing percentage of the naked neck chickens was higher than the feathered chickens; similar observations were also obtained by Bordas, Monnet and Mérat (1980), Mérat (1990) and Deeb and Cahaner (1994).…”

Section: Morphological Traits Of the Different Phenotypes Of Chickenssupporting

confidence: 58%

Morphological characterization of indigenous chickens of Sikkim and West Bengal, India

Banerjee

2012

Anim. Genet. Resour.

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The study was conducted to characterize the variations in physical characters and some important feather and skin mutations observed in different populations of native chickens of West Bengal and Sikkim, India. The data encompassing eight different phenotypes such as, naked neck chicken, frizzled chicken, muffed/bearded chicken, creeper chicken, crested chicken, rumpless chicken, feathered shank chicken and fibromelanosis chicken, were collected from six districts of West Bengal and two districts of Sikkim. Seven qualitative traits such as colour of the egg shell, feather, skin, shank, comb and earlobe as well as the type of feather, and three quantitative traits such as shank length, egg weight and body weight, were assessed in a total of 2 170 fowls of both sexes. The data were analysed statistically using descriptive statistics, the differences in means were compared using Duncan's multiple range test and χ 2 was used for non-parametric characters. Each of the populations had multiple variants and mixed feather colours were seen in most of the chickens while the feather, skin and shank colours were all black in fibromelanosis chickens. The shank colour was predominantly blue, followed by yellow and white. The skin colour in most of the chickens was white. Most of the chickens had a single comb (except for the crested chicken). The highest body weight was observed in the desi chicken while the rumpless chicken weighed the least. The egg-shell colour varied between cream and light brown in all the flocks except for the fibromelanosis chicken whose egg-shell colour was tinted bluish. The highest recorded egg weight was observed in the naked neck chicken, whereas the hatchability and egg weight were the lowest for the rumpless chicken. In the recent years, it has been observed that there is a significant reduction in the population of native chickens. This may be attributed to the restocking with Rhode Island Red and synthetic Kruilor chickens following the avian influenza outbreaks in the region. Hence, immediate steps need to be taken to preserve whatever is left in the native chicken ecotypes in the region.Rangos Múltiples de Duncan, utilizando el ji cuadrado para los caracteres no paramétricos. Cada una de las poblaciones mostró múltiples variantes de color de pluma, mientras que la mayor parte de los colores de pluma, color de piel y patas fue negro en los pollos con fibromelanina. El color de las patas fue predominantemente azul, seguido de amarillo y blanco. El color de la piel en la mayor parte de las aves fue blanco, combinado, y orejillas blancas. El color de la cáscara del huevo varió entre nata y marrón en todas las poblaciones menos los que poseían fibromelanina, en los que el color de la cáscara estaba teñido de azulado. El peso registrado más alto del huevo fue observado en los pollos de cuello pelado, mientras que el peso del huevo fue más bajo para los pollos de arrugas. Se ha observado que hay una reducción significativa en la población de pollos nativos. Esto puede ser atribuido a la reposición ...

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Section: Morphological Traits Of the Different Phenotypes Of Chickenssupporting

confidence: 58%

Morphological characterization of indigenous chickens of Sikkim and West Bengal, India

Banerjee

2012

Anim. Genet. Resour.

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“…The naked neck broilers by virtue of the more exposed skin are able to dissipate heat in a better way and thereby food intake is also more. Bordas et al (1980), Hammade et al (1987a,b), Fathi et al (1993) and Khan (1998) have also reported similar findings.…”

Section: Feed Consumption Feed Conversion Ratiomentioning

confidence: 59%

Performance of Naked Neck versus Normally Feathered Coloured Broilers for Growth, Carcass Traits and Blood Biochemical Parameters in Tropical Climate

Patra¹,

Bais²,

Prasad³

et al. 2002

Asian Australas. J. Anim. Sci

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A population segregating for the naked neck (Na) gene was used to evaluate its effect on fast growing broilers at heat stress. An experimental stock comparable to those of modern broilers was established by backcrossing to colour synthetic male and female lines. Matings between heterozygous (Na/na) males and females produced normally feathered (na/na), heterozygous (Na/na) and homozygous (Na/Na) chicks for the present study. Day old to seven week old coloured broilers of three genotypes viz. normally feathered (na/na), heterozygous naked neck (Na/na) and homozygous naked neck (Na/Na) were compared for heat dissipation, growth performance, body conformation traits, blood biochemical parameters and carcass traits in tropical climate. In hot climate, naked neck broilers had significantly less body temperature and better heat dissipation capabilities as compared to normal broilers. The naked neck broilers had significantly higher body weight and better feed conversion ratio than na/na broilers. The Na/Na or Na/na broilers exhibited higher giblet yield, blood loss and lower feather mass compared to na/na broilers. The results indicated that the reduction in feather coverage in Na/Na and Na/na broilers facilitates better heat dissipation with lower body temperature, more body weight gain, better FCR and carcass traits compared to normal broilers.

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Breeding for feed efficiency and adaptation to feed in poultry

Carré

Mignon-Grasteau

Juin³

2008

World's Poultry Science Journal

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The following paper reviews the current data regarding the physiological origins of variations in feed efficiency, and the effects of genetic selection on energy balance parameters. Effects of diet composition on response to genetic selection are considered by focusing on three feed factors: protein concentration, energy concentration and utilisation of specific ingredients. Analyses of effects of genetic selection on responses to diet composition highlight the problems associated with the increased dietary protein concentrations needed by the latest commercial broilers as a result of genetic selection. The advantages and disadvantages in producing lean birds are discussed from the point of view of feed efficiency and adaptation to feed variation. Lastly, the problems of variation in digestibility resulting from broiler selection are discussed.

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Gène Cou nu, performances de ponte et efficacité alimentaire selon la température chez la poule

Abstract: RésuméDes poules de trois génotypes NaNa (homozygotes « cou nu »), Nana + (hétérozygotes « cou nu ») et na + na + (plumage normal), écloses à partir des mêmes parents, ont

Cited by 9 publications

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Morphological characterization of indigenous chickens of Sikkim and West Bengal, India

Morphological characterization of indigenous chickens of Sikkim and West Bengal, India

Performance of Naked Neck versus Normally Feathered Coloured Broilers for Growth, Carcass Traits and Blood Biochemical Parameters in Tropical Climate

Breeding for feed efficiency and adaptation to feed in poultry

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