Protein and Digestible Threonine Levels in Pre Starter Diets for Broiler Chicks
DOI:
https://doi.org/10.3923/ijps.2013.406.410Keywords:
Digestibility, morfometrical index, performance, protein, threonineAbstract
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.
References
Albino, L.F.T., H.S. Rostagno and A.A. Tejedor, 2002. Variacao de treonina em relacao a lisina em dietas para pintos de corte. Rev. Bras. Cienc. Avic., 4: 58-58.
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.
Barkley, G.R. and I.R. Wallis, 2001. Threonine requirements of broiler chickens: Why do published values differ? Br. Poult. Sci., 42: 610-615.
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.
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.
Dozier, W.A., E.T. Moran, Jr and M.T. Kidd, 2001. Male and female broiler responses to low and adequate dietary threonine on nitrogen and energy balance. Poult. Sci., 80: 926-930.
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.
Kidd, M.T., B.J. Kerr and N.B. Anthony, 1997. Dietary interactions between lysine and threonine in Broilers. Poult. Sci., 76: 608-614.
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.
Kidd, M.T. and B.J. Kerr, 1996. L-threonine for poultry: A review. J. Applied Poult. Res., 5: 358-367.
Noy, Y. and D. Sklan, 2002. Nutrient use in chicks during the first week posthatch. Poult. Sci., 81: 391-399.
Neto, O.A.R. and W.P. Oliveira, 2009. Aminoacidos para frangos de corte. Rev. Bras. Zoot., 38: 205-208.
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.
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.
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.
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.
Williams, P.E.V., 1995. Digestible amino acids for non-ruminant animals: Theory and recent challenges. Anim. Feed Sci. Technol., 53: 173-187.
Zaghari, M., F. Zaefarian and M. Shivazad, 2011. Standardized ileal digestible threonine requirements and its effects on performance and gut morphology of broiler chicks fed two levels of protein. J. Agric. Sci. Technol., 13: 541-552.
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