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Partial dependency plots for the two most important predicting variables in soil model. Brood Soy Free (A) was the most important variable, which represented whether the brood feed is soy free or not, and Pasture Housing (B) was the second important variable. Abbreviations: CT, chicken tractor; CTF, chicken tractor with fencing; CTFR, chicken tractor free ranger; CTF2, chicken tractor with fencing (2 tractors).
