Amount and amino acid composition of basal endogenous protein losses at the terminal ileum of broilers

Blok, M.C.; Jansman, A.J.M.; Makkink, C.A.

doi:10.18174/426332

Cited by 4 publications

(3 citation statements)

References 29 publications

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“…Several methods are available to determine the basal EAA flows in poultry including the regression method, feeding a N-free diet ( NFD ) or a diet containing highly digestible protein, the peptide alimentation (enzyme hydrolyzed casein) method, or the use of fasted birds. Each of these approaches has its advantages and limitations ( Ravindran and Bryden, 1999 ; Bloke et al, 2017 ; Parsons, 2020 ). Of these, basal ileal EAA estimates determined following the feeding of an NFD is now accepted as being valid for the correction of apparent AA digestibility values ( Stein et al, 2007 ; Ravindran et al, 2017 ; Parsons, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Basal ileal endogenous amino acid flow in broiler chickens as influenced by age

et al. 2021

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The current study was carried out to measure the basal ileal endogenous amino acid ( EAA ) flow in male broilers (Ross 308) at different ages (d 7, 14, 21, 28, 35, and 42), following the feeding of a nitrogen-free diet. Titanium dioxide (5 g/kg) was included as an indigestible marker. The nitrogen-free diet was offered for four days prior to ileal digesta collection to 6 replicate cages housing 14 (d 3–7), 12 (d 10–14), 10 (d 17–21), 8 (d 24–28), 8 (d 31–35), and 6 (d 38–42) birds per cage. The basal EAA flow was calculated as g/kg DM intake. The amino acid ( AA ) profile of endogenous protein, expressed as g/100 g protein, was also calculated. The basal endogenous flow of nitrogen and all individual and total AA decreased quadratically ( P < 0.05 to 0.001), with flows being higher on d 7, then decreasing on d 14, plateauing until d 35 and decreasing further on d 42. The concentrations of Trp, Cys, and Gly in the endogenous protein increased linearly ( P < 0.01 to 0.001) with advancing age, whereas a linear decrease ( P < 0.001) was noted for Lys. A quadratic influence ( P < 0.05 to 0.001) was observed for the concentrations of Ile, Leu, Met, Val, and Asp. These changes in the endogenous protein profile may be attributed to variations in the contribution of endogenous sources with age but delineating the exact contribution of different sources is complicated. Overall, the current findings suggest that the basal ileal EAA flow is influenced by broiler age and age-specific EAA flows may need to be considered to standardize the AA digestibility.

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Section: Introductionmentioning

confidence: 99%

Basal ileal endogenous amino acid flow in broiler chickens as influenced by age

et al. 2021

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“…The IEAA flows determined with the NFD feeding method in broiler chickens aged from 21 to 42 days have been reported by many authors, but there is considerable variation within the same age across individual studies [ 28 , 47 ]. On the other hand, there is evidence showing that the basal endogenous AA losses (NFD method) in broiler chickens are age-dependent.…”

Section: Discussionmentioning

confidence: 99%

Standardised Ileal Amino Acid Digestibility in Field Pea Seeds of Two Cultivars Differing in Flower Colour for Broiler Chickens: Effects of Bird Age and Microbial Protease

Szczurek

Świątkiewicz

2020

Animals

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This study aimed to determine and compare standardised ileal digestibility (SID) coefficients of amino acids (AA) in raw seeds of the white-(WF) and the coloured-flowered (CF) field pea cultivar as sole sources of AA in the diets fed to broiler chickens aged 14 or 28 days. An additional purpose was to check the influence of exogenous protease added to pea-based assay diets on AA SID in birds at both ages. Each assay diet was offered to six replicate pens. On both sampling days, the contents from the lower half of the ileum were collected for determination of the apparent digestibility values. The SID coefficients were calculated using ileal endogenous AA losses determined from birds fed an N-free diet. Results indicated a substantial advantage of WF pea over CF pea as a source of digestible Lys, Met, Cys, His, Ile, Leu, Phe, Val, Asp and Glu for 14-day-old chickens. With the exception of methionine and cysteine, there was no significant difference between these two cultivars in the SID values of AA in 28-day-old birds. The protease increased SID of nutritionally essential AA from WF pea-based diet at both ages, and from CF pea-based diet in chickens aged 28 days. In conclusion, the SID coefficients of indispensable AA determined at 14 days of age in low-tannin WF peas are not applicable to the formulation of grower-type feeds containing seeds of CF cultivars.

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“…Composição em aminoácidos das dietas utilizadas no experimento de digestibilidade ileal estandardizada de aminoácidos. Valores analisados, na matéria natural Blok et al (2017). publicaram um compilado de informações sobre os aminoácidos presentes na perda endógena.Nesta publicação houve a junção de 23 a 29 trabalhos determinando a perda endógena de aminoácidos e assim formou-se um valor médio e o desvio padrão para cada aminoácido.…”

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Energia metabolizável e digestibilidade de aminoácidos de coprodutos do etanol de milho para frangos de corte

Oliveira¹

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Amount and amino acid composition of basal endogenous protein losses at the terminal ileum of broilers

Cited by 4 publications

References 29 publications

Basal ileal endogenous amino acid flow in broiler chickens as influenced by age

Basal ileal endogenous amino acid flow in broiler chickens as influenced by age

Standardised Ileal Amino Acid Digestibility in Field Pea Seeds of Two Cultivars Differing in Flower Colour for Broiler Chickens: Effects of Bird Age and Microbial Protease

Energia metabolizável e digestibilidade de aminoácidos de coprodutos do etanol de milho para frangos de corte

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