Effects of Standardized Ileal Digestible Histidine:Lysine Ratio on Growth Performance of 7 to 11 Kg Pigs

An experiment was conducted to determine the standardized ileal digestible (SID) His:Lys ratio requirement for 7 to 11 kg pigs. A total of 360 pigs (DNA 600 x 241, initially 7.1 ± 0.31 kg BW) were fed experimental diets for 10 d with 12 replicates and 5 pigs per pen. Pens were blocked by weight and...

Full description

Saved in:
Bibliographic Details
Published inJournal of animal science Vol. 96; p. 93
Main Authors Cemin, H S, Tokach, M D, Vier, C M, Dritz, S S, Woodworth, J C, DeRouchey, J M, Goodband, R D, Touchette, K J
Format Journal Article
LanguageEnglish
Published Champaign Oxford University Press 01.04.2018
Subjects
Animal models
Animal sciences
Bayesian analysis
Corn
Deoxyribonucleic acid
Diet
DNA
Histidine
Hogs
Lysine
Mathematical models
Proteins
Whey
Whey protein
Online AccessGet full text

Cover

More Information
Summary:An experiment was conducted to determine the standardized ileal digestible (SID) His:Lys ratio requirement for 7 to 11 kg pigs. A total of 360 pigs (DNA 600 x 241, initially 7.1 ± 0.31 kg BW) were fed experimental diets for 10 d with 12 replicates and 5 pigs per pen. Pens were blocked by weight and assigned in a randomized complete block design to 1 of 6 dietary treatments containing 24, 28, 32, 36, 40, or 44% SID His:Lys. Dietary SID Lys was 1.25% and all other AA met or exceeded the NRC (2012) requirement estimates. Diets were corn, spray-dried whey, and whey protein concentrate-based and treatments were formed by adding crystalline L-His at the expense of corn. Response variables ADG, ADFI, and G:F were fitted using general linear and nonlinear mixed models with heterogeneous variances and pen as the experimental unit. Competing models included quadratic polynomial, broken-line linear, and broken-line quadratic. For each response variable, the best fitting model was selected based on Bayesian Information Criterion. Increasing the His:Lys resulted in quadratic increases (P < 0.01) in ADG, ADFI, and G:F. The best fitting model for the three response variables was the broken-line linear. For ADG, the requirement was estimated at 29.7% SID His:Lys (95% CI: 27.8 to 31.6). For ADFI, the breakpoint occurred at 29.1% SID His:Lys (95% CI: 27.6 to 30.6). The maximum G:F was obtained at 29.8% SID His:Lys (95% CI: 27.6 to 32.1). In conclusion, the estimated SID His:Lys requirement for 7 to 11 kg pigs ranged from 29.1% to 29.8%.
ISSN:0021-8812
1525-3163