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Evaluation of a method estimating real-time individual lysine requirements in two lines of growing–finishing pigs

Published online by Cambridge University Press:  08 December 2014

L. Cloutier ,
C. Pomar ,
M. P. Létourneau Montminy ,
J. F. Bernier  and
J. Pomar
L. Cloutier
Affiliation:
Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, 2000 College Street, Sherbrooke, QC, Canada Département des sciences animales, Université Laval, Quebec City, QC, Canada
C. Pomar*
Affiliation:
Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, 2000 College Street, Sherbrooke, QC, Canada
M. P. Létourneau Montminy
Affiliation:
Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, 2000 College Street, Sherbrooke, QC, Canada Département des sciences animales, Université Laval, Quebec City, QC, Canada
J. F. Bernier
Affiliation:
Département des sciences animales, Université Laval, Quebec City, QC, Canada
J. Pomar
Affiliation:
School of Agricultural Engineering, University of Lleida, 191 Alcalde Rovira Roure Avenue, Lleida, Spain
*
†E-mail: candido.pomar@agr.gc.ca
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Abstract

The implementation of precision feeding in growing–finishing facilities requires accurate estimates of the animals’ nutrient requirements. The objectives of the current study was to validate a method for estimating the real-time individual standardized ileal digestible (SID) lysine (Lys) requirements of growing–finishing pigs and the ability of this method to estimate the Lys requirements of pigs with different feed intake and growth patterns. Seventy-five pigs from a terminal cross and 72 pigs from a maternal cross were used in two 28-day experimental phases beginning at 25.8 (±2.5) and 73.3 (±5.2) kg BW, respectively. Treatments were randomly assigned to pigs within each experimental phase according to a 2×4 factorial design in which the two genetic lines and four dietary SID Lys levels (70%, 85%, 100% and 115% of the requirements estimated by the factorial method developed for precision feeding) were the main factors. Individual pigs’ Lys requirements were estimated daily using a factorial approach based on their feed intake, BW and weight gain patterns. From 25 to 50 kg BW, this method slightly underestimated the pigs’ SID Lys requirements, given that maximum protein deposition and weight gain were achieved at 115% of SID Lys requirements. However, the best gain-to-feed ratio (G : F) was obtained at a level of 85% or more of the estimated Lys requirement. From 70 to 100 kg, the method adequately estimated the pigs’ individual requirements, given that maximum performance was achieved at 100% of Lys requirements. Terminal line pigs ate more (P=0.04) during the first experimental phase and tended to eat more (P=0.10) during the second phase than the maternal line pigs but both genetic lines had similar ADG and protein deposition rates during the two phases. The factorial method used in this study to estimate individual daily SID Lys requirements was able to accommodate the small genetic differences in feed intake, and it was concluded that this method can be used in precision feeding systems without adjustments. However, the method’s ability to accommodate large genetic differences in feed intake and protein deposition patterns needs to be studied further.

Keywords

lysine requirementspigprecision feedinggenotype
Type
Research Article
Information
animal , Volume 9 , Issue 4 , April 2015 , pp. 561 - 568
Copyright
© The Animal Consortium. Parts of this are a work of the Government of Canada, represented by the Agriculture and Agri-Food Agency of Canada 2014. 

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