Effect of Age on Feather Amino Acid Content in Two Broiler Strain Crosses and Sexes

Stilborn, H. L.; Moran, E. T.; Gous, R. M.; Harrison, M. D.

doi:10.1093/japr/6.2.205

Cited by 50 publications

(35 citation statements)

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“…Nutrition is one of the major external factors affecting not only the intensity of production, but also the quality of the product -meat (Fujimura and Kadowaki 2006). The knowledge of the content of AAs in the meat of food animals also contributes to better knowledge of their needs (Stilborn et al 1997), which are derived from the percentage of AAs in the body (Saunders et al 1977).…”

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confidence: 99%

“…Some studies focused on the amino acid composition in other species (e.g. Strakova et al 2015;Tumova et al 2015); however, studies for the modern meat cattle breeds are sporadic (Subrt et al 2002;Stilborn et al 1997Stilborn et al , 2010. The genetic potential of cattle has increased in recent years, as have the higher efficiency results in changes in the need for amino acids (Salehifar et al 2012).…”

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Amino acid levels in muscle tissue of eight meat cattle breeds

Vopálenský¹,

Suchý²,

Straková³

et al. 2017

CZECH J ANIM SCI

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Vopálenský J., Suchý P., Straková E., Šimek F., Macháček M., Herzig I. (2017): Amino acid levels in muscle tissue of eight meat cattle breeds. Czech J. Anim. Sci., 62, 339-346.Ten clinically healthy bulls equal in weight were chosen from eight meat cattle breeds maintained in the same geographical conditions using the extensive grazing method. After slaughtering, muscle tissue samples were taken from the musculus longissimus and pars thoracis, and dry matter, nitrogenous substances, fat, and the levels of essential (EAAs) and non-essential (NEAAs) amino acids were determined. Significant differences were found between the monitored genotypes in the contents of dry matter, nitrogenous substances, fat, EAAs, and NEAAs (P ≤ 0.05). The highest concentrations of nitrogenous substances in muscle tissue were detected in the Limousine breed and the lowest in the Aberdeen Angus breed; the highest fat content was found in Aberdeen Angus and the lowest in Galloway. Out of the total sum of EAAs, the highest percentage in the dry matter of muscle tissue in all genotypes was found for Lys (8.8-10.4%), the lowest percentage was found for Met (2.4-2.9%). The value of Thr was approximately 4.6, Val 5.1, Ile 4.8, Leu 8.2, Phe 4.1, His 4.2, and Arg 8.0%. Significant differences (P ≤ 0.05) between the monitored breeds were found in all EAAs, except for Val and Leu. Regarding NEAAs, out of the total protein, the highest percentage was found for Glu (13.9-15.1%). Conversely, the lowest values were detected for Ser (3.8-4.1%) and Tyr (3.8-4.4%). The values of other NEAAs were approximately 9.3 for Asp, 4.0 for Ser, 5.3 for Pro, 5.5 for Gly, and 6.1% for Ala. Significant differences (P ≤ 0.05) were found between the monitored genotypes in all NEAAs except for Pro and Ala. In the dry matter of muscle tissue, out of the total protein, the sum of EAAs ranged from 50.6 (Meat Simmental) to 52.0% (Limousine), and NEAAs ranged from 48.0 (Limousine) to 49.4% (Meat Simmental). Apart from its effect on the biological value of meat, representation of individual amino acids is important to enhance its taste or smell.Keywords: meat cattle breeds; musculus longissimus dorsi; dry matter; protein; fat; essential and non-essential amino acids List of abbreviations: EAAs = essential amino acids, NEAAs = non-essential amino acids, Asp = aspartic acid, Thr = threonine, Ser = serine, Glu = glutamic acid, Pro = proline, Gly = glycine, Ala = alanine, Val = valine, Met = methionine, Ile = isoleucine, Leu = leucine, Tyr = tyrosine, Phe = phenylalanine, His = histidine, Lys = lysine, Arg = arginine, AA = Aberdeen Angus, BA = Blonde d'Aquitaine, Lim = Limousine, Char = Charolais, Gas = Gasconne, MS = Meat Simmental, Sal = Salers, Gall = Galloway

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confidence: 99%

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confidence: 99%

Amino acid levels in muscle tissue of eight meat cattle breeds

Vopálenský¹,

Suchý²,

Straková³

et al. 2017

CZECH J ANIM SCI

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“…); in contrast, data concerning the content of AA in the whole bodies of chickens, including feathers, at the end of fattening, are only sporadic (Stilborn et al 1997(Stilborn et al , 2010. What is primarily lacking in current practice is, however, any monitoring of the broiler hybrids.…”

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confidence: 99%

“…Knowledge of the amino acids (AA) content in the whole body and feathers of broiler chickens contributes to better understanding of their requirements (Stilborn et al 1997), which are derived from the presence of AA in the bodies of broiler chickens (Saunders et al 1977). An optimal content of AA in the diet is particularly important for animal growth.…”

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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

Straková¹,

Suchý²,

Navrátil³

et al. 2015

Czech J. Anim. Sci.

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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).Keywords: broiler chickens; chemical analysis; essential amino acids; nonessential amino acids; AA spectrum List of abbreviations: DM = dry matter, CP = crude protein, AA = amino acids, EAA = essential amino acids, NEAA = nonessential amino acids, Lys = lysine, Thr = threonine, Try = tryptophan, His = histidine, Phe = phenylalanine, Leu = leucine, Ile = isoleucine, Met = methionine, Cys = cysteine, Val = valine, Arg = arginine, Asp = aspartate, Ser = serine, Glu = glutamate, Pro = proline, Gly = glycine, Ala = alanine, Val = valine, Tyr = tyrosine

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