Abstract
The Effect of Phase-Feeding Strategies on Growth Performance and Carcass Characteristics of Growing-Finishing Pigs: I. Lysine Levels at the Estimated Requirement
Highlights
Phase-feeding programs have been widely used to closely meet the nutrient requirements of grow-finish pigs and to reduce nutrient excretion in the environment.3 Accurate estimates of nutritional requirements are essential to develop phase-feeding strategies and to minimize the supply of nutrients in excess or deficiency
Treatments consisted of four feeding programs: a 1-phase feeding program with 0.82% standardized ileal digestible (SID) lysine from 60 to 280 lb body weight (BW); a 2-phase feeding program with 0.96 and 0.77% SID lysine from 60 to 220 and 220 to 280 lb BW, respectively; a 3-phase feeding program with 1.13, 0.89, and 0.77% SID lysine from 60 to 110, 110 to 220, and 220 to 280 lb BW, respectively; and a 4-phase feeding program with 1.13, 0.96, 0.82, and 0.77% SID lysine from 60 to 110, 110 to 160, 160 to 220, and 220 to 280 lb, respectively
The lysine levels were determined based on the estimated lysine requirements to achieve 100% of maximum growth rate for the weight range in each phase, using an equation developed by the genetic supplier
Summary
Phase-feeding programs have been widely used to closely meet the nutrient requirements of grow-finish pigs and to reduce nutrient excretion in the environment. Accurate estimates of nutritional requirements are essential to develop phase-feeding strategies and to minimize the supply of nutrients in excess or deficiency. Phase-feeding programs have been widely used to closely meet the nutrient requirements of grow-finish pigs and to reduce nutrient excretion in the environment.. Accurate estimates of nutritional requirements are essential to develop phase-feeding strategies and to minimize the supply of nutrients in excess or deficiency. Simplification of phase-feeding strategies has been a topic of growing interest. Previous studies suggest that simplification of feeding strategies to fewer phases can maximize growth performance, carcass characteristics, and economics.. Setting the lysine concentration is the core component of developing a phase-feeding program. Feeding programs with fewer dietary phases provide lysine levels below the requirements initially and rely on compensatory growth later on when lysine levels are adequate.. Pigs exhibiting compensatory growth utilize nutrients more efficiently and have reduced nitrogen excretion, which may be beneficial to improve the overall efficiency of swine production. Feeding programs with fewer dietary phases provide lysine levels below the requirements initially and rely on compensatory growth later on when lysine levels are adequate. Pigs exhibiting compensatory growth utilize nutrients more efficiently and have reduced nitrogen excretion, which may be beneficial to improve the overall efficiency of swine production.
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