Improving the Utilization of Diets Low in Crude Protein for Broiler Chicken 1. Evaluation of Special Amino Acid Supplementation to Diets Low in Crude Protein

Jiang, Q. K.; Waldroup, P. W.; Fritts, C. A.

doi:10.3923/ijps.2005.115.122

Cited by 44 publications

(6 citation statements)

References 19 publications

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“…However, with an excessive reduction in dietary CP, even with the supplementation of EAA, animals can present a reduction in performance, as observed in this and other studies (Awad et al, 2015; Corzo et al, 2005; Jiang et al, 2005; Maia et al, 2021). This may indicate that non‐essential amino acids (NEAA) have an essential role in muscle deposition, especially glycine (Incharoen et al, 2010; Jiang et al, 2005; Siegert & Rodehutscord, 2019), when dietary nitrogen is limited. EAA requirements were established considering a minimum dietary CP.…”

Section: Discussionsupporting

confidence: 79%

“…Until certain reduction in dietary CP, animals can reduce the nitrogen excretion, increasing the available nitrogen for amino acids synthesis and maintaining the same performance (Deschepper & deGroote, 1995). However, with an excessive reduction in dietary CP, even with the supplementation of EAA, animals can present a reduction in performance, as observed in this and other studies (Awad et al, 2015; Corzo et al, 2005; Jiang et al, 2005; Maia et al, 2021). This may indicate that non‐essential amino acids (NEAA) have an essential role in muscle deposition, especially glycine (Incharoen et al, 2010; Jiang et al, 2005; Siegert & Rodehutscord, 2019), when dietary nitrogen is limited.…”

Section: Discussionsupporting

confidence: 79%

Section: Discussionsupporting

confidence: 70%

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Effect of crude protein reduction in blood, performance, immunological, and intestinal histological parameters of broiler chickens

Kuritza

Almeida

Santos

et al. 2022

Animal Science Journal

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Section: Discussionsupporting

confidence: 79%

Section: Discussionsupporting

confidence: 79%

Section: Discussionsupporting

confidence: 70%

See 1 more Smart Citation

Effect of crude protein reduction in blood, performance, immunological, and intestinal histological parameters of broiler chickens

Kuritza

Almeida

Santos

et al. 2022

Animal Science Journal

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show abstract

“…In this study, 2% lower dietary CP supplemented with synthetic amino acids had similar growth compared with the 0% reduction CP level with equal amino acid supplementation. This result indicated that amino acid supplementation could be used to replace and meet the amino acid loss that originated from dietary CP (Jiang et al, 2005).…”

Section: Discussionmentioning

confidence: 95%

Gut microflora and intestinal morphology changes of broiler chickens fed reducing dietary protein supplemented with lysine, methionine, and threonine in tropical environment

et al. 2019

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Non-ruminantsFull-length research article Gut microflora and intestinal morphology changes of broiler chickens fed reducing dietary protein supplemented with lysine, methionine, and threonine in tropical environment ABSTRACT -This experiment aimed to discover the effect of reducing dietary protein supplemented with lysine, methionine, and threonine on growth performance, volatile fatty acid profile, and intestinal villus height and crypt depth of broilers, as well as the microflora counts isolated from broiler chicken faeces. A total of 288-day-old broilers were allocated to eight treatments with six replicates consisting of 36 birds per treatment. The diets contained dietary protein from 21 to 18% in starter diet and 18 to 16% in finisher diet supplemented with L-lysine, DL-methionine, and L-threonine at the same ratio for all dietary treatments. Body weight and feed intake were determined, and feed conversion ratio was calculated. Blood, intestine, and digesta samples were collected at 21 and 42 days for further analysis. Dietary protein supplemented with amino acids improved growth performance, reduced pathogenic bacteria, and increased beneficial bacteria counts, small intestine villi height and crypt depth, and ileal-digesta volatile fatty acid concentrations of broiler chickens. However, reducing 2% of dietary protein supplemented with lysine, methionine, and threonine showed the best results, especially in growth performance, feed conversion ratio, microflora count, duodenal and jejunal villi height, and ileal-digesta volatile fatty acid concentrations, such as butyric and valeric acids. It is believed that by reducing the level of dietary protein in broiler diet while supplementing with synthetic amino acid may enhance the intestinal morphology, nutrient digestibility, and absorption in broiler chickens and will simultaneously result in better performance.

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“…Therefore, L-leucine being the least available amino acids would still be fairly absorbed in adequate amounts. In low protein diets, Lleucine may also accelerate the degradation of other BCAAs, mainly in muscles through the stimulated activity of branched-chain α-ketoacid dehydrogenase [16] , which lead to the lowering of valine and iso-leucine in rat tissues. The results of this study indicate that addition of L-leucine in low protein diet may have toxic effects on grower broiler chickens as reflected by reduced feed intake, feed consumption and increase FCR even though they were not significant.…”

Section: Discussionmentioning

confidence: 99%

Effect of L-Leucine Supplementation on Growth Performance and Carcass Characteristics of Grower-Broiler Chickens Fed Low Protein Diets

Erwan¹,

Alimon²,

Sazili³

et al. 2009

American J. of Animal and Veterinary Sciences

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Problem statement: Supplementation of broiler diets with cristalline amino acids (i.e. lysine, ethionine and threonine) may support equal broiler growth and improve overall amino acids balance and enable a reduction in CP level of diets. Approach: A trial was conducted to evaluate the effect of supplemental L-leucine in diets containing recommended levels and low crude protein (20 and 18%, respectively) with constant metabolizable energy (3200 kcal kg −1 ) for broilers from 21-42 day of age. Six experimental diets were formulated with three levels of supplemental L-leucine, 0, 0.5 and 0.67% and two levels of crude protein. A total of 180 1 day-old Cobb broiler chickens were randomly divided into 36 experimental pens, 5 chickens in each pen, with each diet replicated 6 times. The dietary treatments were offered from 21-42 days of age. Feed intake, body weight gain and Feed Conversion Ratio (FCR) were measured on a weekly basis. At the end of the feeding trial the birds were slaughtered and carcass analyses conducted. Results: Feed intake, weight gain and FCR were not affected by increasing levels of L-leucine supplementation. Weight gain was significantly reduced (p<0.05), whereas feed intake and FCR were not significantly affected with decreasing dietary crude protein. A positive response in breast meat yield was achieved by the addition of L-leucine to levels up to 0.5% in the diet but a significant decrease was noted when the level reached 0.67% in diet. Supplementation of L-leucine significantly (p<0.05) decreased the relative weights of the liver and gizzard. However, the addition of L-leucine significantly reduced carcass weights when L-leucine was added at 0.67%. Lowering the dietary protein level also significantly reduced breast yield and carcass weight (p<0.05). However, abdominal fat, gizzard, liver and heart were not affected by protein level. Conclusion/Recommendations: It can be concluded that supplementation of L-leucine at levels up to 0.67% of the diet did not affect performance but deleteratious the carcass weight.

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Improving the Utilization of Diets Low in Crude Protein for Broiler Chicken 1. Evaluation of Special Amino Acid Supplementation to Diets Low in Crude Protein

Cited by 44 publications

References 19 publications

Effect of crude protein reduction in blood, performance, immunological, and intestinal histological parameters of broiler chickens

Effect of crude protein reduction in blood, performance, immunological, and intestinal histological parameters of broiler chickens

Gut microflora and intestinal morphology changes of broiler chickens fed reducing dietary protein supplemented with lysine, methionine, and threonine in tropical environment

Effect of L-Leucine Supplementation on Growth Performance and Carcass Characteristics of Grower-Broiler Chickens Fed Low Protein Diets

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