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. 2019 Aug 2;97(10):4032–4040. doi: 10.1093/jas/skz255

Figure 4.

Figure 4.

Fitted broken-line linear (BLL) and broken-line quadratic (BLQ) regression models on average daily gain (ADG) as a function of increasing standardized total tract digestible (STTD) P intake in grams per day in 11- to 23-kg pigs fed diets with 1,000 added phytase units in Exp 2. The BLL breakpoint was estimated at 2.92 g/d (95% CI: [2.56, 3.27g/d]) STTD P. Based on the BLL model, the estimated regression equation was ADG, g = 545.11 − 51.3991 × (2.917 − STTD P in g/d) if STTD P intake < 2.92 g/d, and ADG, g = 545.11 if STTD P intake ≥ 2.92 g/d. The BLQ breakpoint was estimated at 3.02 g/d (95% CI: [3.00, 3.03g/d]) STTD P. Based on the BLQ model, the estimated regression equation was ADG, g = 544.96 − 17.2077 × (3.019 − STTD P in g/d) − 35.7972 × (3.019 − STTD P in g/d)2 if STTD P intake < 3.02 g/d, and ADG, g = 544.96 if STTD P intake ≥ 3.02 g/d.