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Histological profile of breast and leg muscles of Silkies chickens and of slow-growing Hubbard JA 957 broiler

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Lukasiewicz M., Mroczek-Sosnowska N., Wnuk A., Kamaszewski M., Adamek D., Tarasewicz L., Zuffa P., Niemiec J.

Annals of Warsaw University of Life Sciences - SGGW. Animal Science

2013

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The experiment was conducted with 60 slow-growing Hubbard JA 957 broilers and with 60 Silkies chickens reared until the 63rd day of life, in three replications, 20 birds each, in a closed building on litter. A three-stage feeding program was applied in the rearing period. Feed mixtures used in the experiment did not differ in contents of nutrients. In the first stage of rearing (till 21 days of life) the chickens were fed a standard starter feed mixture containing: 20.98% of total protein, 2,845 kcal/kg of me-tabolizable energy, 1.17% of lysine and 0.98% of met. + cys. In the period from 22 to 56 days of life they were receiving a grower type mixture containing: 20.0% of total protein, 2,900 kcal/kg of energy, 1.04% of lysine and 0.88% of met. + + cys., whereas contents of these components in the finisher type mixture administered till the end of the rearing period were as follows: 18% of protein, 2,965 kcal/kg of EM, 0.90% of lysine and 0.78% of met. + cys. On day 63 of rearing, 12 cockerels and 12 hens were selected random from each group. The birds were slaughtered in a poultry slaughter house, and specimens of their major breast muscle (m. pectoralis superficialis) and thigh muscle (biceps femoris) were sampled for analyses. The breast and leg muscles of the birds were characterized by diversified diameters of muscle fibers depending on bird genotype. The greatest diameters were found in breast and leg muscles of the slow-growing Hubbard JA 957 broilers, which was confirmed statistically (P < 0.01). It was also demonstrated that the mean diameter of muscle fibers of Silkies chickens was more than two times smaller compared to the Hubbard JA 957 chickens.

Ograniczanie wyników

1 Annals of Warsaw University of Life Sciences - SGGW. Animal Science

1 Adamek D.

1 Kamaszewski M.

1 Lukasiewicz M.

1 Mroczek-Sosnowska N.

1 Niemiec J.

1 Tarasewicz L.

1 Wnuk A.

1 Zuffa P.

1 2013

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Histological profile of breast and leg muscles of Silkies chickens and of slow-growing Hubbard JA 957 broiler