Comparison of the content of crude protein and amino acids in the whole bodies of cocks and hens of Ross 308 and Cobb 500 hybrids at the end of fatteningá E., Suchý P., Navrátil P., Karel T., Herzig I. (2015): Comparison of the content of crude protein and amino acids in the whole bodies of cocks and hens of Ross 308 and Cobb 500 hybrids at the end of fattening. Czech J. Anim. Sci., 60: 67-74.
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Dry matter (DM), crude protein (CP), and the content of individual amino acids (AA) were determined in the bodies of Ross 308 and Cobb 500 hybrids including feathers after 40 days of fattening. Percentages for the content of individual AA were then calculated from the total sums of AA. The level of CP, irrespective of sex, was 453.16 ± 5.916 g/kg of DM for the Ross and 470.94 ± 5.404 g/kg of DM for the Cobb hybrid (P ≤ 0.05). For both hybrids, the content of CP was significantly (P ≤ 0.01) higher for cocks as opposed to hens. The AA levels in DM, irrespective of sex, were higher in the Cobb hybrid except for Glu; it was significantly higher for Asp, Ser, Ala, Lys (P ≤ 0.01), and Thr and Arg (P ≤ 0.05). The values for the majority of AA were higher for cocks than for hens in both hybrids. For the majority of essential AA, significant (P ≤ 0.01; P ≤ 0.05) differences were recorded between sexes. For non-essential AA except for Ser and Ala, significantly (P ≤ 0.01; P ≤ 0.05) higher values were found in cocks. Of the total sums of AA in DM of Ross broilers, the largest presence (here and after in %) was that of Glu (14.92), followed by Leu (8.80), Asp (8.73), Gly (8.71), Arg (7.21), Val (6.33), and Pro (6.09). The lowest contents were those of Met (2.41) and His (3.28). For the Cobb hybrid, the AA were Glu (13.90), Asp (9.12), Gly (8.48), Leu (8.43), Arg (7.48), Lys (6.44), and Pro (6.09). The AA lowest contents were those of Met (2.30) and His (3.16).
Aletor V?A, Hamid I?I, Nie� E, Pfeffer E (2000): Low-protein amino acid-supplemented diets in broiler chickens: effects on performance, carcass characteristics, whole-body composition and efficiencies of nutrient utilisation. Journal of the Science of Food and Agriculture, 80, 547-554<547::AID-JSFA531>3.0.CO;2-C
AOAC (2003): Official Methods of Analysis. 17th Ed. Association of Official Analytical Chemists, Gaithersburg, USA.
Applegate T.J., Angel R. (2008): Protein and amino acid requirements for poultry [serial online], 6: 1–8. Available from (accessed Nov 1, 2014).
Baker D.H. (1997): Ideal amino acid profiles for swine and poultry and their application in feed formulation. Biokyowa Technical Review, 9, 1–24.
Bogosavijevic-Boskovic S., Pavlovski Z., Petrovic M.D., Doskovic V., Rakonjac S. (2010): Broiler meat quality: proteins and lipids of muscle tissue. African Journal of Biotechnology, 9, 9177–9182.
Dozier W. A., Kidd M. T., Corzo A. (2008): Dietary Amino Acid Responses of Broiler Chickens. The Journal of Applied Poultry Research, 17, 157-167
Emmans G.C. (1989): Computer simulation in poultry nutrition. In: Proc. 3rd European Symposium on Poultry Nutrition. Peebles, UK, 91–104.
Hussein A. S., Cantor A. H., Pescatore A. J., Gates R. S., Burnham D., Ford M. J., Paton N. D. (2001): Effect of Low Protein Diets with Amino Acid Supplementation on Broiler Growth1. The Journal of Applied Poultry Research, 10, 354-362
Kreuzer M., Kirchgessner M., Steinhart H. (1988): Effect of the level of energy and protein supply, respectively of age on the amino acid composition of broiler chicks. Archiv Geflügelkunde, 52, 133–141.
Meluzzi Adele, Sirri Federico, Castellini Cesare, Roncarati Alessandra, Melotti Paolo, Franchini Achille (2010): Influence of genotype and feeding on chemical composition of organic chicken meat. Italian Journal of Animal Science, 8, 766-
Mukhtar A.M., Mekkawi A., El Tigani M. (2007): The effect of feeding increasing levels of synthetic lysine and methionine in broiler chicks. Research Journal of Animal Veterinary Science, 2, 18–20.
National Research Council (1994): Nutrient Requirements of Poultry. 9th Ed. The National Academies Press, Washington, USA.
Nitsan Zafrira, Dvorin A., Nir I. (): Composition and amino acid content of carcass, skin and feathers of the growing gosling. British Poultry Science, 22, 79-84
Pellett P.L., Kaba H. (1972): Carcass amino acids of the rat under condition of determination of net protein utilization. Journal of Nutrition, 102, 61–68.
Saunders A.J., Wessels J.P.H., Gous R.M. (1977): Carcass amino acid composition and utilization of dietary amino acids by chickens. South African Journal of Animal Science, 7, 111–115.
Salehifar E., Shivazad M., Foroudi F., Chamani M., Bahari Kashani R. (2012): Reevaluation of digestible amino acid requirements of male and female broilers based on different ideal amino acids ratios in starter period. Livestock Science, 147, 154-158
Sklan D., Noy Y. (2005): Direct determination of optimal amino acid intake for maintenance and growth in broilers. Poultry Science, 84, 412-418
Stilborn H. L., Moran E. T., Gous R. M., Harrison M. D. (1997): Effect of Age on Feather Amino Acid Content in Two Broiler Strain Crosses and Sexes. The Journal of Applied Poultry Research, 6, 205-209
Stilborn H. L., Moran E. T., Gous R. M., Harrison M. D. (2010): Influence of age on carcass (feather-free) amino acid content for two broiler strain-crosses and sexes. The Journal of Applied Poultry Research, 19, 13-23
Strakova E., Suchy P., Vitula F., Vecerek V. (2006): Differences in the amino acid composition of muscles from pheasant and broiler chickens. Archiv für Tierzucht, 49, 508–514.
Suchy P., Jelinek P., Strakova E., Hucl J. (2002): Chemical composition of muscles of hybrid broiler chickens during prolonged feeding. Czech Journal of Animal Science, 47, 511–518.
Zelenka J., Heger J., Zeman L. (2007): Recommended nutrient content in poultry diets and nutritive value of feeds for poultry. Mendel University of Agriculture and Forestry, Brno, Czech Republic. (in Czech)
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