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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.18.0407    [Accepted] Published online August 27, 2018.
Dietary supplemental guanidinoacetic acid and betaine: effects on performance of broilers under cold stress
Masoomeh Nasiroleslami1, Mehran Troki1,*, AliReza Abdolmohammadi1
Department of Animal Science, College of Agriculture and Natural Resources, Razi University, Imam Avenue, PO Box 6715685418, Kermanshah, Iran
Correspondence:  Mehran Troki, Tel: +98-9133277266, Fax: +98-831-8321083, Email: torki@razi.ac.ir
Received: 30 May 2018   • Revised: 9 July 2018   • Accepted: 25 August 2018
This study was conducted to determine the effects of dietary guanidinoacetic acid (GAA) and betaine supplementation on performance of broilers subjected to cold stress.
Based on a 2×2 factorial arrangement, 384 day-old male broiler chicks (Cobb) were randomly distributed between four experimental diets (with eight replicates and 12 birds per replicate) included two levels (zero and 1200 mg/kg) of guanidinoacetic acid and (zero and 600 mg/kg) of betaine. The birds were raised at 32-35°C during 1 to 7 d and at 30°C during 8 to 11d. Then, all birds were subjected to a step-down temperature program of 1 to 2°C per day to 12-15°C in 21th day, which remained constant until the end of the experiment. At the end of the rearing phases (starter, grower and finisher) chicks and feed residual were weighed. Body weight gain (BWG), feed intake (FI), feed conversion ratio (FCR), mortality rate and production efficiency factor (PEF) were calculated for the chicks in each replicate cage.
No significant effects of dietary supplemental guanidinoacetic acid and betaine on performance (BWG, FI, mortality, and PEF) of the broilers were observed. A significant interaction between dietary supplemental guanidinoacetic acid and betaine on FCR during 23-42 days of age (finisher) was observed. Improved FCR was found in birds fed control and control supplemented with guanidinoacetic acid and betaine diets.
The results indicated that the dietary supplementation with GAA and betaine could improve FCR under low ambient temperature.
Keywords: Betaine; Guanidinoacetic acid; Broiler; Performanance

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