Dietary Amino Acid Responses of Broiler Chickens

Dozier, W. A.; Kidd, M. T.; Corzo, A.

doi:10.3382/japr.2007-00071

Cited by 107 publications

(77 citation statements)

References 53 publications

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“…Low protein diets fortified with synthetic AA have been the subject of extensive research. Supplementing low-CP diets with synthetic AA has been shown to save cost (Dozier et al, 2008) and decrease nitrogen excretion (Bregendahl et al, 2002). However, excessive low-CP diets are still not recommendable even with AA fortification (Awad et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Amino Acids Fortification of Low-protein Diet for Broilers Under Tropical Climate. 2. Nonessential Amino Acids and Increasing Essential Amino Acids

Awad

Zulkifli

Farjam

et al. 2014

Italian Journal of Animal Science

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A three-week trial was carried out to evaluate the effect of nonessential amino acids (NEAA) supplementation to a low-crude protein (CP) diet with adequate essential amino acids (EAA) level on growth performance, blood metabolites, and relative weights of abdominal fat, breast yield, and internal organs in broiler chickens raised under tropical hot and humid environment. Five isocaloric (3000 metabolisable energy/kg) corn-soybean diets were administered (1 to 21 days) to 5 groups of broilers (60 birds/group) as follows: i) 22.2% CP (positive control; PC); ii) 16.2% CP+all EAA to meet or exceed the National Research Council (1994) recommendations (negative control; NC); iii) NC+further EAA to equal the levels in the PC diet; iv) NC+NEAA to equal the levels in the PC; v) NC+EAA and NEAA to equal the amino acids levels in the PC diet. The results showed that the fortification of EAA alone, only improved feed intake (FI), whereas, addition of NEAA or EAA+NEAA significantly enhanced body weight, daily weight gain, and FI and decreased the feed conversion ratio to the same levels as in PC. Serum uric acid was significantly reduced and serum triglyceride increased in NC group. Dietary treatments had no significant effect on relative weights of heart, liver, abdominal fat, breast meat yield, serum albumin, and serum total protein. In conclusion, these results suggest that NEAA fortification may improve the growth performance of broilers fed an excessive low-CP diet under tropical hot and humid condition.

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Section: Introductionmentioning

confidence: 99%

Amino Acids Fortification of Low-protein Diet for Broilers Under Tropical Climate. 2. Nonessential Amino Acids and Increasing Essential Amino Acids

Awad

Zulkifli

Farjam

et al. 2014

Italian Journal of Animal Science

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“…However, modern broilers consume less feed per unit of body weight gain (BWG) and reach their target weights in fewer days due to genetic improvements compared to broilers used in previous years (Dozier et al, 2008). Therefore, dietary AAs need of the modern commercial broiler should be increased.…”

Section: Introductionmentioning

confidence: 99%

Broiler Responses to Reduced Protein and Energy Diets Supplemented With Lysine, Methionine and Threonine

Abudabos

Aljumaah

2012

J. Poult. Sci.

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This study was performed to evaluate the effect of supplementation of low crude protein (CP) corn-soybean meal diets which contained low ME levels with lysine (Lys), methionine (Met) and threonine (Thr) above that recommended by the National Research Council (NRC, 1994) on broiler performance, carcass characteristics and serum constituents from 12 to 33 d of age. A total of 100 Ross chicks were randomly distributed in a randomized complete block design among 20 cages with 5 replicate cages / treatment with four dietary treatments: T1＝Control diet (21% CP and 3150 kcal/kg ME); T2, T3 and T4 contained 19.5% CP and 115% of Lys, Met and 108% of Thr compared to the NRC requirements; T2, T3 and T4 contained 3150, 3100 and 3050 kcal of metabolizable energy (ME)/kg, respectively. Cumulative feed intake, body weight gain and feed conversion ratio from 12 to 33 d of age was not affected by treatment. Birds which had received T2 and T3 had a higher dressing percentage compared to those which had received T1. Breast muscle yield followed the same trend; heavier breasts were obtained from birds which had received T2 and T3. Serum uric acid concentration was influenced by treatment; it was significantly higher for birds which had received the control diet compared to all other treatments. Based on presented evidences, it can be concluded, that by fortifying crystalline amino acids to broilers diet at this stage of production, dietary CP and ME could be reduced to 19.5% and 3050 kcal/kg, respectively.

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“…The National Research Council recommended a level of ME of 3200 kcal/kg for broilers up to 56 days of age. However, according to Dozier et al (2008) modern broilers consume less feed per unit of body weight gain and reach their target weights in fewer days due to genetic improvements compared to broilers used in previous years and as a result the level of nutrients has to be adjusted. The high cost of supplemental energy necessitates the optimisation of ME in the diets especially during the finisher period where the feed consumption is the greatest (Pesti et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

The Relationship Between Guanidino Acetic Acid and Metabolisable Energy Level of Diets on Performance of Broiler Chickens

Abudabos

Saleh²,

Lemme

et al. 2014

Italian Journal of Animal Science

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This work aimed to investigate the effects on performance and carcass characteristics of broiler chickens of 2 levels of guanidino acetic acid (GAA) in a commercial form (CreAMINO ® ) and 4 levels of metabolisable energy. The eight dietary regimens were tested for starter (0-10 d), grower (11-22 d) and finisher (23-35 d) periods on a total of 200 male ROSS 308 broiler chickens in a factorial arrangements of treatments (2 4), with experimental diet fed to 5 replicate pens with 4 birds each. The results revealed a positive effect for CreAMINO ® supplementation on feed conversion ratio (FCR) for the starter, grower, finisher and cumulative periods (P<0.05, 0.05, 0.01 and 0.001, respectively); feed conversion was significantly improved in the treatment with CreAMINO ® supplementation vs unsupplemented group. During the grower period, a significant difference in FCR was observed for metabolisable energy (ME) level (P<0.01). When examining the cumulative period of the trial (0 to 35 days of age), two-way interaction was significant for feed intake and body weight gain. Birds receiving the control level of energy, 75 or 50 kcal/kg lower ME than the control, consumed less feed when supplemented with CreAMINO ® . Birds receiving 25 kcal/kg lower ME or the control energy levels gained more weight when supplemented with CreAMINO ® . In summary, GAA (as CreAMINO) improved FCR of broilers in each period as well as cumulatively, while ME level also affected FCR. CreAMINO ® supplementation to reduced-energy diets showed FCR improvements, while the best performance was detected for the diet with 50 kcal/kg lower ME.

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Dietary Amino Acid Responses of Broiler Chickens

Cited by 107 publications

References 53 publications

Amino Acids Fortification of Low-protein Diet for Broilers Under Tropical Climate. 2. Nonessential Amino Acids and Increasing Essential Amino Acids

Amino Acids Fortification of Low-protein Diet for Broilers Under Tropical Climate. 2. Nonessential Amino Acids and Increasing Essential Amino Acids

Broiler Responses to Reduced Protein and Energy Diets Supplemented With Lysine, Methionine and Threonine

The Relationship Between Guanidino Acetic Acid and Metabolisable Energy Level of Diets on Performance of Broiler Chickens

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