Effect of dietary &bgr;‐alanine supplementation on growth performance, meat quality, carnosine content, and gene expression of carnosine‐related enzymes in broilers

ABSTRACT The objective of the current study was to investigate the effect of dietary &bgr;‐alanine supplementation on growth performance, meat quality, antioxidant ability, carnosine content, and gene expression of carnosine‐related enzymes in broiler chicks. We randomly assigned 540 1‐day‐old Arbor Acres broilers to 5 dietary treatments supplemented with 0 (control group), 250, 500, 1,000, or 2,000 mg/kg of &bgr;‐alanine (mg &bgr;‐alanine per kg feed). Each treatment included 6 replicates of 18 birds. The feeding trial lasted for 42 d. Dietary &bgr;‐alanine supplementation linearly and quadratically increased the average daily gain (ADG) during the starting period (d 1 to 21, P = 0.02 and P = 0.002). The feed conversion ratio (FCR) decreased quadratically in response to dietary &bgr;‐alanine supplementation during the starting and entire periods (P < 0.001 and P = 0.003, respectively). For the entire period, the predicted best FCR would be achieved when &bgr;‐alanine was fed at a level of 1,100 mg/kg from quadratic regression. The concentrations of carnosine and &bgr;‐alanine in breast muscle increased quadratically with dietary &bgr;‐alanine supplementation (d 42, P < 0.001 and P = 0.001, respectively). The predicted dietary &bgr;‐alanine level for highest breast carnosine content was 1,196 mg/kg. Dietary supplementation with &bgr;‐alanine reduced the taurine concentrations in plasma (d 42, linear and quadratic, P < 0.001). Breast muscle yield increased linearly and quadratically in response to dietary &bgr;‐alanine addition (d 21, P = 0.017 and P = 0.007). Dietary supplementation with &bgr;‐alanine quadratically reduced the shear force (P = 0.003), whereas a*45 min and a*24 h values increased quadratically in response to dietary &bgr;‐alanine supplementation (d 42, P = 0.020 and P = 0.021, respectively). Dietary &bgr;‐alanine addition quadratically enhanced the expression of carnosine synthase and taurine transporter mRNAs (P < 0.05). Overall, dietary &bgr;‐alanine supplementation improved growth performance and carnosine content, ameliorated antioxidant capacity and meat quality, and upregulated the gene expression of carnosine synthesis‐related enzymes in broiler chicks.

• Publication year

  2018

• Venue

  Poultry Science

• Publication date

  2018-04-01

• Fields of study

  Agricultural and Food Sciences, Medicine, Biology

• Identifiers
  DOI 10.3382/ps/pex410PMID 29325148
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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