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29 June 2021 Dietary glycine equivalent and standardized ileal digestible methionine + cysteine levels for male broiler chickens fed low-crude-protein diets
Paschal Chukwudi Aguihe, Ivan Camilo Ospina-Rojas, Marcia Izumi Sakamoto, Paulo Cesar Pozza, Eustace Ayemere Iyayi, Alice Eiko Murakami
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Abstract

This study was conducted to determine the optimum dietary glycine equivalent (Glyequi) level in low-crude-protein diets of 181 g·kg−1 containing varied concentrations of standardized ileal digestible (SID) methionine + cysteine (Met + Cys) for broiler chicks (1–21 d old). A total of 1275, 1-d-old Cobb-Vantress® male broilers were distributed in a 5 × 3 factorial arrangement with a completely randomized design of 15 treatments with five replicates of 17 birds each. Treatments consisted of five levels of dietary Glyequi (14.9, 16.4, 17.9, 19.4, and 20.6 g·kg−1) and three concentrations of SID Met + Cys (7.70, 9.0, and 10.3 g·kg−1). Interactions between Glyequi and SID Met + Cys levels were observed for feed:gain (P = 0.055) and breast meat yield (BMY) (P = 0.017). In 7.7 and 9.0 g SID Met + Cys·kg−1 diets, optimal feed:gain and increased BMY were observed at Glyequi levels not lower than 17.9 g·kg−1. In 10.3 g SID Met + Cys·kg−1 diet, a lower feed:gain was achieved at 19.4 g Glyequi·kg−1. Therefore, a minimum dietary level of 17.9 g Glyequi·kg−1 is needed to increase growth of broilers fed diets containing 7.7 or 9.0 g·kg−1 SID Met + Cys, whereas 19.4 g·kg−1 Glyequi is necessary in diets containing 10.3 g·kg−1 SID Met + Cys for optimum growth.

Paschal Chukwudi Aguihe, Ivan Camilo Ospina-Rojas, Marcia Izumi Sakamoto, Paulo Cesar Pozza, Eustace Ayemere Iyayi, and Alice Eiko Murakami "Dietary glycine equivalent and standardized ileal digestible methionine + cysteine levels for male broiler chickens fed low-crude-protein diets," Canadian Journal of Animal Science 102(1), 19-29, (29 June 2021). https://doi.org/10.1139/CJAS-2021-0009
Received: 27 January 2021; Accepted: 16 May 2021; Published: 29 June 2021
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KEYWORDS
breast weight
Broiler chicken
creatine
créatine
équivalent à la glycine
glycine equivalent
methionine + cysteine
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