Abstract
Effect of Phase-Feeding Strategies on Growth Performance and Carcass Characteristics of Growing-Finishing Pigs: Strategies to Reduce Dietary Phases Using a Field Approach on Lysine Levels
Highlights
Previous studies suggest simplification of feeding strategies to fewer dietary phases can lead to similar growth performance, carcass characteristics, and economics similar to feeding strategies with multiple dietary phases in the grow-finish period
The objective of this study was to evaluate whether simplification of phase-feeding strategies using a field approach with lysine specifications slightly below the estimated requirement for maximum growth rate is possible without compromising overall performance and carcass characteristics of grow-finish pigs
Treatments consisted of four feeding programs with lysine specifications set at 98.5% of estimated requirements for maximum growth rate and 97.5% of maximum feed efficiency (F/G) for the weight range in each phase, except for the last phase of one of the 2-phase feeding programs which the lysine specifications were set for 100% of estimated requirements of maximum growth rate
Summary
Previous studies suggest simplification of feeding strategies to fewer dietary phases can lead to similar growth performance, carcass characteristics, and economics similar to feeding strategies with multiple dietary phases in the grow-finish period. This has been observed when using lysine specifications set at 100% of the estimated requirement of maximum growth rate. It may be speculated that the lysine levels in phase-feeding strategies with fewer dietary phases were severely reduced in the early grower period or were not sufficiently increased in the late finisher period to allow for compensatory growth to occur. Our hypothesis is that increasing lysine levels from 98 to 100% of estimated requirements in late finishing in a 2-phase feeding strategy or decreasing lysine levels earlier instead of later in a 3-phase feeding strategy with lysine at 98% of estimated requirements could lead to similar performance to a 4-phase feeding strategy with lysine at 98% of estimated requirements for maximum growth rate
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