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Fig. 3. Effect of water and nitrogen intake on excreta. In yellow-vented bulbuls,
both water and protein intake had a significant effect on the proportion of
nitrogen excreted as ammonia. The proportion of nitrogen excreted as ammonia
was positively correlated with water intake (A: y=0.6x+18.4,
r2=0.54, F1,18=21.3,
P=0.0002). The residuals of this relationship were negatively
correlated with protein intake (B: y=-0.03x+5.5,
r2=0.23, F1,18=5.4,
P=0.03).