Developing farm-specific lysine requirements using accretion curves: Data collection procedures and techniques
James W. Smith II, MS, PhD; Mike D. Tokach, MS, PhD; Allan P. Schinckel, MS, PhD; Steve S. Dritz, DVM, PhD; Mark Einstein, MS; Jim L. Nelssen, MS, PhD; Robert D. Goodband, MS, PhD
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Two methods of determining farm-specific lysine requirements are described. Using serial weighing and ultrasonic scanning of 40 pigs per gender at 3-week intervals throughout the entire growing-finishing phase, liveweight growth and protein and lipid accretion rates can be determined. Data are fit to two functions: a generalized nonlinear function for weight and protein mass, and a generalized exponential function for lipid mass. Lysine requirement estimates are calculated based upon the lysine needs for lean growth. The serial analysis can be used to determine daily lysine requirements (g per day, % of diet, or g:Mcal ME) and assess environmental impacts on growth from farm to farm. A second analysis uses mass weighing and scanning of 32 pigs per gender at five 3-week age intervals (384 pigs total) to determine protein and lipid accretion curves. These curves can then also be used to determine lysine needs. The mass method can be used to determine lysine needs as g per day, percent of diet, or g:Mcal ME similar to the serial method. These procedures allow for the assessment of farm-specific nutrient requirements, which can improve the efficiency of lean gain and reduce nutrient excretion. In addition, farm-specific data collected by these procedures can be used in the NRC swine growth model.
Keywords: lysine, lipid, protein, ultrasound, farm-specific
Cite as: Smith JW, Tokach MD, Schinckel AP, et al. Developing farm-specific lysine requirements using accretion curves: Data collection procedures and techniques. J Swine Health Prod 1999;7(6):277-282.
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