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Interaction effects of glycine equivalent and standardized ileal digestible threonine in low protein diets for broiler grower chickens |
Paschal Chukwudi Aguihe1,* 
, Amanda Barroso Castelani2
, Camilo Ivan Ospina-Rojas3
, Eustace Ayemere Iyayi4
, Paulo Cesar Pozza2
, Alice Eiko Murakami2,*
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1Department of Animal Production and Heath Technology, Federal College of Wildlife Management, P.M.B 268, New Bussa 912106, Nigeria
2Departamento de Zootecnia, Universidade Estadual de Maringá, Maringá, Paraná, 87020-900, Brazil
3CJ Corporation, Monsões, São Paulo 04571- 010, Brazil
4Department of Animal Science, University of Ibadan, Ibadan 200005, Nigeria |
Correspondence:
Paschal Chukwudi Aguihe, Tel: +234-815-945-7940, Email: aguihepc@gmail.com
Alice Eiko Murakami, Tel: +55-44-9973-2331, Fax: +55-44-3011-4729, Email: aemurakami@uem.br
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Received: 15 August 2023 • Revised: 26 October 2023 • Accepted: 10 December 2023 |
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| Abstract |
Objective
This study aims to investigate the interactive effect of a glycine equivalent (Glyequi) and standardized ileal digestible threonine (SID Thr) levels in low crude protein diets on performance, blood biochemistry, pectoral muscular creatine content and oxidative stability of meat in broiler chickens from 21 to 42 days.
Methods
A total of 1,500, twenty-one-day-old Cobb-Vantress male broiler chickens were distributed in a completely randomized 5×3 factorial arrangement of Glyequi×SID Thr with five replicates of 20 birds each. Fifteen dietary treatments of 16.5% CP were formulated to contain five levels of total Glyequi (1.16%, 1.26%, 1.36%, 1.46%, and 1.56%) and three levels of SID Thr (0.58%; 0.68% and 0.78%).
Results
Interaction effects (p<0.05) of Glyequi and SID Thr levels were observed for weight gain, carcass yield, pectoral muscular creatine content and serum uric acid. Higher levels of Glyequi increased (p = 0.040) weight gain in 0.58% and 0.68% SID Thr diets compare to the 0.78% SID Thr diet. The SID Thr level at 0.68% improved (p = 0.040) feed conversion compared to other SID Thr diets. Levels of Glyequi equal to or above 1.26% in diets with 0.78% SID Thr resulted in birds with higher (p = 0.033) pectoral muscular creatine content. The breast meat yield observed in the 0.68% SID Thr diet was higher (p = 0.05) compared to the 0.58% SID Thr diet. There was a quadratic effect of Glyequi levels for pectoral pectoral muscular creatine content (p = 0.008), breast meat yield (p = 0.030), and serum total protein concentrations (p = 0.040), and the optimal levels were estimated to be 1.47%, 1.35%, and 1.40% Glyequi, respectively. The lowest (p = 0.050) concentration of malondialdehyde in the breast meat was found in 0.68% SID Thr diets at 1.36% Glyequi.
Conclusion
The minimum dietary level of Glyequi needed to improve performance in low crude protein diets is 1.26% with adequate SID Thr levels for broiler chickens. |
| Keywords:
Broiler; Glycine Equivalent; Muscle Creatine; Performance; Serum Biochemistry; Threonine |
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