. 2019 Oct 16;4(1):307–315. doi: 10.1093/tas/txz162

Table 3.

Effects of added fat and initial sort on weight variation, carcass traits in finishing pigs (experiment 1)¹

Added dietary fat:	0%			6%			Main effect P-value				Interaction P-value
Sort category:²	HEAVY	LIGHT	MIXED	HEAVY	LIGHT	MIXED	SEM	Fat	HEAVY vs.LIGHT	Sorted³ vs.MIXED	HEAVY vs. LIGHTby fat	Sorted vs. MIXEDby fat
Pig weight, kg
day 0	34.68	26.79	30.80	34.72	26.79	30.63	0.330	0.88	0.01	0.91	0.95	0.75
day 56	77.62	63.52	70.80	78.38	66.17	71.06	0.930	0.11	0.01	0.55	0.32	0.38
day 88	105.42	89.96	97.41	106.49	93.10	98.60	1.009	0.03	0.01	0.40	0.31	0.60
day 109	125.63	110.90	117.42	124.43	114.08	119.19	1.079	0.17	0.01	0.63	0.05	0.68
Pig weight, CV⁴
day 0	8.72	11.02	15.87	8.72	12.67	15.42	0.706	0.49	0.01	0.01	0.25	0.30
day 56	11.55	15.69	15.05	12.76	14.72	16.20	1.257	0.65	0.02	0.08	0.39	0.64
day 88	9.07	13.34	13.25	11.38	12.77	14.08	0.997	0.30	0.01	0.02	0.16	0.98
day 109	8.38	12.18	12.40	9.98	12.79	12.59	0.933	0.30	0.01	0.05	0.60	0.58
Average daily gain, CV
day 0 to 56	18.61	23.68	20.09	19.75	20.35	21.23	2.184	0.85	0.44	0.97	0.31	0.56
day 56 to 88	14.52	14.41	17.35	15.21	17.11	17.33	1.312	0.30	0.18	0.08	0.45	0.45
day 88 to 109	19.06	17.74	22.47	18.99	21.75	18.60	2.526	0.99	0.84	0.60	0.42	0.19
Overall	10.83	14.54	14.48	12.89	15.18	14.14	1.236	0.44	0.05	0.38	0.57	0.43
Carcass traits⁵
Back fat, mm	14.99	14.15	14.44	15.02	14.41	14.59	0.013	0.59	0.10	0.66	0.75	1.00
Fat-free lean index, %	51.63	51.30	51.53	51.53	51.35	51.58	0.153	0.98	0.20	0.46	0.63	0.80
Lean, %	56.95	57.56	57.14	57.02	57.16	57.48	0.290	0.99	0.38	0.58	0.43	0.32
Loin depth, cm	6.02	6.11	5.90	6.11	5.91	6.27	0.134	0.42	0.85	0.70	0.30	0.07

¹A 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.

⁴Coefficient of variation.

⁵Values derived from processing plant.