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

Abstract

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

Proximate Chemical Composition, Amino Acids Profile and Minerals Content of Meat Depending on Carcass Part, Sire Genotype and Sex of Meat Rabbits

“…AA contents were determined following acid hydrolysis in 6 N HCl at 110 °C for 24 h using the Automatic Amino acid Analyzer AAA 400 (Ingos a.s., Prague, Czech Republic), based on the colour-forming reaction of AA with the oxidative agent ninhydrin according to procedures used by Straková et al [ 23 ]. The AA analysis was used to determine the value of pure protein, expressed as the sum of EAA–lysine (Lys), leucine (Leu), isoleucine (Ile), threonine (Thr), arginine (Arg), histidine (His), phenylalanine (Phe), valine (Val), methionine (Met) and of non-essential AA (NEAA)–serine (Ser), asparagine (Asp), glutamine (Glu), proline (Pro), glycine (Gly), alanine (Ala), tyrosine (Tyr).…”

Amino acid levels in muscle tissue of eight meat cattle breeds

“…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).…”

The ability to resist Newcastle disease through inherited immunity in different strains of broilers in Nineveh governorate

“…Both hybrids Cobb 500 and Ross 308 are excellent to keep by following the housing and feeding requirements ( Strakova et al , 2015 ). They achieve weights of 2 kg and above in 42 days, but the superior genetics of Cobb 500 give an extra edge to this hybrid breed, since, Cobb 500 has better average daily weight gains and growth performance ( El-Tahawy et al , 2017 ; Pascalau et al , 2017 ) and better immune defense system to counter diseases than Ross 308 ( Mayahi et al , 2016 ; Gholami et al , 2020 ).…”