Table 5.

Effects of RFI line and hygiene conditions on oxidative enzymes in perirenal adipose tissue of growing pigs

	LRFI		HRFI				P values
	Good	Poor	Good	Poor	MSE	Line	Hygiene	LxH
Week 6 (n = 36)
HAD	4.42	5.55	4.42	5.60	1.59	0.96	0.04	0.96
CS	3.85	4.37	3.85	4.72	1.13	0.65	0.07	0.64
Week 13–14 (n = 35)
HAD	3.78	4.12	3.56	4.53	1.4	0.84	0.17	0.51
CS	6.82	3.24	2.86	3.59	4.4	0.24	0.35	0.16

Pigs from two genetic lines divergently selected for low (LRFI) or high (HRFI) RFI were housed either in good or poor hygiene conditions during the first 6 weeks after their transfer in growing-finishing pens (period 1, challenge). Half of these pigs were killed at week 6, whereas another half were placed in good hygiene conditions until slaughter at weeks 13 to 14 (period 2, recovery). Enzymes related to oxidative nutrient catabolism, namely beta-hydroxy-acylCoA-dehydrogenase (HAD) and citrate synthase (CS) were measured (μmole/min/g tissue) in adipose tissue. LxH: interaction between hygiene (H) and RFI line (L). MSE: root mean standard error of the statistical model. Bold face highlights significant differences (P ≤ 0.05) between treatments, and when italicized, this denotes a trend (0.05 < P ≤ 0.10)