Abstract
Effects of Dietary Standardized Ileal Digestible Valine:Lysine Ratio on 14 to 22 lb Nursery Pigs
Highlights
Inclusion of dietary crystalline amino acids is a common practice in the swine industry
A total of 280 nursery pigs (PIC 327 × 1050; initially 14.4 lb BW) were used in a 28-d growth trial to evaluate the effects of increasing dietary standardized ileal digestible (SID) Valine:Lysine (Val:Lys) ratio on nursery pig growth performance
Experimental diets were fed for 14 d, which included SID valine concentrations of 50, 57, 63, 68, 73, 78, and 85% of Lys
Summary
Inclusion of dietary crystalline amino acids is a common practice in the swine industry. The NRC (2012)[4] estimates that the valine requirement for approximately 15 to 25 lb pigs is 63.7% SID Val:Lys, while Nemechek et al (2014)[5] determined that 65% SID Val:Lys was necessary for optimal growth of 15 to 25 lb pigs. Pigs in this experiment were fed at the Lys requirement for ADG, which may underestimate the Val:Lys requirement. The objective of this study was to determine the SID Val:Lys requirement for nursery pigs weighing approximately 14 to 22 lb when fed marginally below their dietary lysine requirement
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