Table 3.

Regression estimates, standard errors, 95 % confidence intervals and coefficients of determination (R²) for the fitted relationship: , where Y was the body ash weight and X was the body protein weight under the following three ad libitum feeding schedules: (1) pigs were given protein-deficient feeds; (2) pigs were given nutritionally balanced feeds; (3) pigs were given phosphorus-deficient feeds^*

(Regression estimates, standard errors, 95 % confidence intervals and coefficients of determination)

Parameter	Feed class	Estimate	se	95 % CI	P	R2
ln(a)	Protein-deficient	−1·57	0·0477	−1·67, −1·48		0·983 (protein-deficient)
	Balanced	−1·63	0·0324	−1·70, −1·57
	P-deficient	−1·68	0·0563	−1·79, −1·57		0·972 (balanced)
b	Protein-deficient	1·08	0·0289	1·02, 1·14	0·00880
	Balanced	0·981	0·0150	0·951, 1·01	0·204	0·956 (P-deficient)
	P-deficient	0·873	0·0261	0·821, 0·926	1·18 × 10–5

^*Probability values were given for the direct test of whether the estimated relationship was isometric (b = 1). A total of 211 individual data points representing mean values for each considered dietary treatment reported in twenty-five studies (see online Supplementary material for a list of included studies) were used in the analysis.