Table 2.

Effects of added fat and initial sort on growth performance of finishing pigs (experiment 1)¹

Added dietary fat:	0%			6%			Main effect P-value				Interaction P-value
	HEAVY	LIGHT	MIXED	HEAVY	LIGHT	MIXED	SEM	Fat	HEAVY vs. LIGHT	Sorted3 vs. MIXED	HEAVY vs. LIGHT by fat	Sorted vs. MIXED by fat
Sort category:2
Average daily gain, kg
day 0 to 56	0.75	0.64	0.70	0.77	0.69	0.71	0.014	0.04	0.01	0.42	0.27	0.45
day 56 to 88	0.85	0.82	0.82	0.87	0.84	0.85	0.012	0.02	0.06	0.50	1.00	0.68
day 88 to 109	1.07	0.98	1.00	1.00	1.00	1.01	0.021	0.35	0.10	0.65	0.04	0.28
Overall	0.84	0.77	0.80	0.83	0.80	0.81	0.009	0.08	0.01	0.51	0.03	0.66
Average daily feed intake, kg
day 0 to 56	1.83	1.47	1.64	1.69	1.43	1.52	0.032	0.01	0.01	0.33	0.10	0.73
day 56 to 88	2.64	2.30	2.44	2.37	2.17	2.24	0.039	0.01	0.01	0.37	0.11	0.99
day 88 to 109	3.02	2.67	2.77	2.60	2.44	2.56	0.044	0.01	0.01	0.63	0.03	0.13
Overall	2.26	1.93	2.06	2.03	1.82	1.91	0.031	0.01	0.01	0.41	0.05	0.76
Gain:feed ratio
day 0 to 56	0.41	0.43	0.42	0.45	0.48	0.46	0.006	0.01	0.01	0.56	0.76	0.79
day 56 to 88	0.32	0.35	0.34	0.36	0.38	0.38	0.006	0.01	0.01	0.22	0.12	0.12
day 88 to 109	0.36	0.37	0.36	0.38	0.41	0.39	0.007	0.01	0.02	0.99	0.25	0.99
Overall	0.36	0.39	0.38	0.41	0.43	0.42	0.004	0.01	0.01	0.89	0.90	0.45

¹ A total of 1,032 gilts (24 or 25 pigs per pen and 7 pens per treatment) with an initial average weight of 30.7 kg.

²Pigs were sorted based on body weight at placement. HEAVY, pig from the heaviest 50% of the population; LIGHT, pig from the lightest 50% of the population; MIXED, pigs from the whole population with normal distribution around body weight mean.

³Mean of combined HEAVY and LIGHT treatment groups.