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The number 400 in the pig weight formula is a conversion factor derived from empirical data and statistical analysis. Researchers and farmers have measured many pigs, comparing their actual weights to their girth and length measurements. Through this process, they determined that dividing the product of the girth squared and the length by 400 provides a reasonably accurate estimate of a pig’s weight in pounds.
This factor helps standardize the measurements and convert them into an approximate weight, making it a practical tool for farmers who need to estimate the weight of their pigs without a scale.
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