Digestible isoleucine requirements for 22- and 42-day-old
               broilers

Current experiment established different criteria to evaluate the requirements of digestible isoleucine for 22- and 42-day-old broilers by different regression models (quadratic, exponential and Linear Response Plateau) and, in the case of statistical significance, the comparison of means by Duncan's test at 5% probability. A total of 1,920 Cobb 500 male broilers were used in an entirely randomized experimental design, with 6 treatments (6 digestible isoleucine levels: 0.6118; 0.6655; 0.7192; 0.7729; 0.8265 and 0.8802%) and 8 replications, with 40 broilers each. Data on performance and carcass characteristics were evaluated. Level 0.7192% of digestible isoleucine was considered standard. The digestible isoleucine level recommended for 22- and 42-day-old broilers is 0.7729%, corresponding to a digestible isoleucine:lysine ratio of 72%.

digestible amino acids; ideal protein; performance; regression analyses

Authorship

Karina Ferreira Duarte ^**Author for correspondence. E-mail: karinafduarte@yahoo.com.br

Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista "Júlio de Mesquita Filho", Via de Acesso Prof. Paulo Donato Castellane, s/n, 14884-900, Jaboticabal, São Paulo, Brazil.Universidade Estadual Paulista "Júlio de Mesquita Filho"BrazilJaboticabal, São Paulo, BrazilFaculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista "Júlio de Mesquita Filho", Via de Acesso Prof. Paulo Donato Castellane, s/n, 14884-900, Jaboticabal, São Paulo, Brazil.

Otto Mack Junqueira

Universidade Federal de Goiás, Goiânia, Goiás, Brazil.Universidade Federal de GoiásBrazilGoiânia, Goiás, BrazilUniversidade Federal de Goiás, Goiânia, Goiás, Brazil.

Faculdade de Engenharia, Universidade Estadual Paulista "Júlio de Mesquita Filho", Ilha Solteira, São Paulo, Brazil.Universidade Estadual Paulista "Júlio de Mesquita Filho"BrazilIlha Solteira, São Paulo, BrazilFaculdade de Engenharia, Universidade Estadual Paulista "Júlio de Mesquita Filho", Ilha Solteira, São Paulo, Brazil.

Rosemeire da Silva Filardi

Antonio Carlos de Laurentiz

Carla Heloísa de Faria Domingues

Eliana Aparecida Rodrigues

Instituto Federal de Educação, Ciência e Tecnologia do Triangulo Mineiro, Uberaba, Minas Gerais, Brazil.Instituto Federal de Educação, Ciência e Tecnologia do Triangulo MineiroBrazilUberaba, Minas Gerais, BrazilInstituto Federal de Educação, Ciência e Tecnologia do Triangulo Mineiro, Uberaba, Minas Gerais, Brazil.

*Author for correspondence. E-mail: karinafduarte@yahoo.com.br

SCIMAGO INSTITUTIONS RANKINGS

Universidade Federal de Goiás, Goiânia, Goiás, Brazil.Universidade Federal de GoiásBrazilGoiânia, Goiás, BrazilUniversidade Federal de Goiás, Goiânia, Goiás, Brazil.

Tables

Tables (4)

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Table 1:
Chemical analyses and composition in total (TAA) and digestible (DAA) amino acids of ingredients in the experimental diets.

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Table 2:
Percentage composition of experimental diets for 22-42-day-old broilers.

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Table 3:
Feed intake (FI), weight gain (WG), feed conversion (FCR), viability (VC) and productive efficiency index (IEP) of broilers, between 22 and 42 days and between 1 and 42 days, fed on diets with different digestible isoleucine levels.

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Table 4:
Carcass yield (CY), breast yield (BrY), thigh + drumstick yield (TH+DR), back yield (BY) and wing yield (WY) of broilers fed on diets containing different digestible isoleucine levels from 22 to 42 days of age.

Table 1: Chemical analyses and composition in total (TAA) and digestible (DAA) amino acids of ingredients in the experimental diets.

¹
Total amino acids, determined by Degussa Laboratory - Animal Nutrition Service - São Paulo, São Paulo State, Brazil. ²Digestible amino acids, based on digestibility coefficients of Tabelas Brasileiras para Aves e Suínos (Rostagno et al., 2005Rostagno, H. S., Albino, L. F. T., Donzele, J. L., Gomes, P. C., Oliveira, R. d., Lopes, D. C., Euclides, R. F. (2005). Composição de alimentos e exigências nutricionais Tabelas brasileiras para aves e suínos (Vol. 2).).

Table 2: Percentage composition of experimental diets for 22-42-day-old broilers.

¹
Enrichment per kilogram of diet: 8,000 IU vitamin A, 1,800 IU vitamin D3, 12 mg vitamin E, 2 mg vitamin K3, 1 mg vitamin B1, 4 mg vitamin B2, 1 mg Vitamin B6, 10 mcg Vitamin B12, 0.40 mg folic acid, 0.04 mg biotin, 28 mg niacin, 11 mg of calcium pantothenate, 6 mg Cu, 0.10 mg Co, 1 mg I, 50 mg Fe, 65 mg Mn, 45 mg Zn, 0.21 mg Se, 500 mg choline chloride 50%, 60 mg coccidiostat, 12 mg antioxidant. ² Duarte et al. (2012Duarte, K. F., Junqueira, O. M., Filardi, R., Siqueira, A., JC, Garcia, E. A. & Laurentiz, A. (2012). Exigências em treonina para frangos de corte de 22 a 42 dias de idade. Revista Brasileira de Zootecnia, 41(1), 72-79. ). ³ Duarte et al. (2013Duarte, K. F., Junqueira, O. M., Filardi, R. d. S., Siqueira, J. C. d., Puzotti, M. M., Garcia, E. A., Laurentiz, A. C. (2013). Digestible tryptophan requirements for broilers from 22 to 42 days old. Revista Brasileira de Zootecnia, 42(10), 728-733. ).⁴ Duarte et al. (2014Duarte, K. F., Junqueira, O. M., Faria Domingues, C. H., Silva Filardi, R., Borges, L. L. & Praes, M. F. F. M. (2014). Digestible valine requirements for broilers from 22 and 42 days old. Acta Scientiarum.Animal Sciences, 36(2), 151-156. ), ⁵ Rostagno et al. (2005Rostagno, H. S., Albino, L. F. T., Donzele, J. L., Gomes, P. C., Oliveira, R. d., Lopes, D. C., Euclides, R. F. (2005). Composição de alimentos e exigências nutricionais Tabelas brasileiras para aves e suínos (Vol. 2).). L-Isoleucine was added to the basal diet to replace L-Glutamic Acid so that all treatments would have the same nitrogen level and to eliminate any effects related to differences in their concentration. In the broilers' metabolism, the supply of a non-specific nitrogen source plus essential amino acids is required for the synthesis of non-essential amino acids and other nitrogen compounds. Thus, diets with low levels of isoleucine contained higher levels of L-Glutamic acid.

Table 3: Feed intake (FI), weight gain (WG), feed conversion (FCR), viability (VC) and productive efficiency index (IEP) of broilers, between 22 and 42 days and between 1 and 42 days, fed on diets with different digestible isoleucine levels.

Values have been adjusted for mortality weight. VC = viability (number of finished birds); IEP = [average daily WG (g) x VC (%)] / (FC x 10). NS = not significant; *p < 0.05; ¹Linear effect; ²Means in the column followed by different letters differ (p < 0.05) by Duncan's test.

Table 4: Carcass yield (CY), breast yield (BrY), thigh + drumstick yield (TH+DR), back yield (BY) and wing yield (WY) of broilers fed on diets containing different digestible isoleucine levels from 22 to 42 days of age.

NS = not significant, ¹eviscerated carcass without feet, head and neck.

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Digestible isoleucine requirements for 22- and 42-day-old broilers

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[1] *Author for correspondence. E-mail: karinafduarte@yahoo.com.br