Alexandre Barbosa de Brito
Departamento de Producao Animal, Escola de Veterinaria e Zootecnia, Universidade Federal de Goias, (UFG/EVZ), Goiania - Goias, Brazil
Jose Henrique Stringhini
Departamento de Producao Animal, Escola de Veterinaria e Zootecnia, Universidade Federal de Goias, (UFG/EVZ), Goiania - Goias, Brazil
Roberto de Moraes Jardim Filho
Departamento de Producao Animal, Escola de Veterinaria e Zootecnia, Universidade Federal de Goias, (UFG/EVZ), Goiania - Goias, Brazil
Suzany Aparecida Gomes Xavier
Departamento de Producao Animal, Escola de Veterinaria e Zootecnia, Universidade Federal de Goias, (UFG/EVZ), Goiania - Goias, Brazil
Marcos Barcellos Cafe
Departamento de Producao Animal, Escola de Veterinaria e Zootecnia, Universidade Federal de Goias, (UFG/EVZ), Goiania - Goias, Brazil
Nadja Susana Mogyca Leandro
Departamento de Producao Animal, Escola de Veterinaria e Zootecnia, Universidade Federal de Goias, (UFG/EVZ), Goiania - Goias, Brazil
ABSTRACT
This experiment was carried out in experimental poultry facilities of University of Goias to estimate digestible threonine (Thr) requirement for broiler from 1 to 21 days of age. 384 AgRoss-508 broiler chicks were allotted in a completely randomized design in a 4 x 2 factorial arrangement, with two protein levels (205 and 221 g/kg) and four digestible threonine levels (6.1, 7.1, 8.1 and 9.1 g/kg) with four replications of 12 birds each. The performance, nutrient digestibility and morfometrical index were evaluated. The polynomial regression and linear response plateau (LRP) model was used to estimate digestible, had been the Minimum Square of Deviations (MSD) utilized for choice criterion. Used polynomial regression, the results showed that a quadratic effect (p<0.05) for mean body weight at seven and 21 days of age (seven days - Y = -31.41 + 455.28x - 285.62x2/21 days - Y = 510.08 + 508.91x - 324.61x2) which estimates a 7.9 and 7.1 g/kg of digestible Thr, but LRP model showed low MSD and smaller estimates for digestible Thr levels (7.7 and 6.7 g/kg in seven and 21 days, respectively). The results showed a tendency if lower levels of digestible Thr (below to 7.1 g/kg) reduced intestinal length. The digestible Thr levels recommended for pre-starter phase vary from 7.7 at 6.7 g/kg, estimated by LRP model and 7.9 at 7.1 g/kg estimated by polynomial regression for mean body weight at seven and 21 days of age, respectively, but the LRP values presented smaller minimum square of deviations.
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How to cite this article
Alexandre Barbosa de Brito, Jose Henrique Stringhini, Roberto de Moraes Jardim Filho, Suzany Aparecida Gomes Xavier, Marcos Barcellos Cafe and Nadja Susana Mogyca Leandro, 2013. Protein and Digestible Threonine Levels in Pre Starter Diets for Broiler Chicks. International Journal of Poultry Science, 12: 406-410.
DOI: 10.3923/ijps.2013.406.410
URL: https://scialert.net/abstract/?doi=ijps.2013.406.410
DOI: 10.3923/ijps.2013.406.410
URL: https://scialert.net/abstract/?doi=ijps.2013.406.410
REFERENCES
- Atencio, A., L.F.T. Albino, H.S. Rostagno, J.E. Oliveira, F.M. Vieites and J.L. Donzele, 2004. Exigencias de treonina para frangos de corte machos nas fases de 1 a 20, 24 a 38 e 44 a 56 dias de idade. R. Bras. Zootec., 33: 880-893.
Direct Link - Berres, J., S.L. Vieira, J.L.B. Coneglian, A.R. Olmos, D.M. de Freitas, T.C.K. Bortolini and G.X. Silva, 2007. Broiler responses to graded increases in the threonine to lysine ratio. Cienc. Rural Santa Maria, 37: 510-517.
Direct Link - Ciftci, I. and N. Ceylan, 2004. Effects of dietary threonine and crude protein on growth performance, carcase and meat composition of broiler chickens. Br. Poult. Sci., 45: 280-289.
CrossRefDirect Link - Emmert, J.L. and D.H. Baker, 1997. Use of the ideal protein concept for precision formulation of amino acid levels in broiler diets. J. Applied Poult. Res., 6: 462-470.
Direct Link - Kidd, M.T., B.J. Kerr and N.B. Anthony, 1997. Dietary interactions between lysine and threonine in Broilers. Poult. Sci., 76: 608-614.
Direct Link - Kidd, M.T., P.D. Gerard, J. Heger, B.J. Kerr, D. Rowe, K. Sistani and D.J. Burnham, 2001. Threonine and crude protein responses in broiler chicks. Anim. Feed Sci. Technol., 94: 57-64.
CrossRefDirect Link - Noy, Y. and D. Sklan, 2002. Nutrient use in chicks during the first week posthatch. Poult. Sci., 81: 391-399.
CrossRefPubMedDirect Link - Rosa, A.P., G.M. Pesti, H.M. Edwards Jr. and R.I. Bakalli, 2001. Threonine requirements of different broiler genotypes. Poult. Sci., 80: 1710-1717.
CrossRefDirect Link - Samadi and F. Liebert, 2007. Threonine requirement of slow-growing male chickens depends on age and dietary efficiency of threonine utilization. Poult. Sci., 86: 1140-1148.
Direct Link - Shan, A.S., K.G. Sterling, G.M. Pesti, R.I. Bakalli, J.P. Driver and A.A. Tejedor, 2003. The influence of temperature on the threonine and tryptophan requirements of young broiler chicks. Poult. Sci., 82: 1154-1162.
CrossRefDirect Link - Webel, D.M., S.R. Fernandez, C.M. Parsons and D.H. Baker, 1996. Digestible threonine requirement of broiler chickens during the period three to six and six to eight weeks posthatching. Poult. Sci., 75: 1253-1257.
PubMed