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Standardized ileal digestible tryptophan and lysine for 15–30 kg gilts

Published online by Cambridge University Press:  09 November 2020

T. J. Pasquetti*
Affiliation:
Universidade Estadual de Maringá/UEM, Maringá-PR, Brazil
L. A. C. Esteves
Affiliation:
Universidade Estadual de Maringá/UEM, Maringá-PR, Brazil
V. R. C. de Paula
Affiliation:
Universidade Estadual de Maringá/UEM, Maringá-PR, Brazil
L. P. Bonagúrio
Affiliation:
Universidade Estadual de Maringá/UEM, Maringá-PR, Brazil
W. Tanamati
Affiliation:
Universidade Estadual de Maringá/UEM, Maringá-PR, Brazil
M. R. Fachinello
Affiliation:
Universidade Estadual de Maringá/UEM, Maringá-PR, Brazil
N. T. E. Oliveira
Affiliation:
Universidade Estadual do Oeste do Paraná, Marechal Cândido Rondon-PR, Brazil
P. C. Pozza
Affiliation:
Universidade Estadual de Maringá/UEM, Maringá-PR, Brazil
*
Author for correspondence: T. J. Pasqusetti, E-mail: pasquettizoo@yahoo.com.br

Abstract

It was aimed to simultaneously study standardized ileal digestible (SID) tryptophan (Trp) and lysine (Lys) for gilts. A digestibility assay was previously conducted to determine the SID amino acid in the basal diet (low levels of SID Trp and Lys). Sixty-four gilts (15.04 ± 1.44 kg) were allotted to 16 diets in a 4 × 4 factorial arrangement (1.55, 1.85, 2.15 and 2.45 g/kg SID Trp and 9.72, 11.12, 12.52 and 13.92 g/kg SID Lys) with four replicates per treatment. Performance, longissimus muscle (LM), backfat thickness (BF) and blood variables were evaluated. An interaction was observed for G:F, and by response surface model, the optimum Trp level was achieved at 2.15 g/kg (0.159 g/MJ of ME). A quadratic effect of Trp was observed on body weight (BW) and average daily gain (ADG); the daily feed intake increased linearly as Trp increased. The optimum Trp levels of 2.25 and 2.24 g/kg were estimated for BW and ADG, respectively. The BF increased with increasing levels of Trp. There was a quadratic and linear effect of Trp and Lys, respectively, on the LM, in which the optimum Trp level was determined as 2.05 g/kg in the diet. Plasma urea nitrogen decreased as Trp and Lys levels increased. Using estimates provided by response surface, maximized G:F ratio was obtained at 2.15 g SID Trp/kg of diet and at least 13.92 g SID Lys/kg of diet is necessary to optimize the G:F for 15–30 kg gilts, providing a Trp:Lys ratio of 15.4:100.

Type
Animal Research Paper
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press

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