TABLE 4.

Performance and feeding behavior traits of lambs for extreme RFI index and FR index during 100% concentrates CAF period.

		RFI-BV− (efficient)	RFI-BV+ (inefficient)			FR-BV+ (rapid)	FR-BV− (slow)
		Lsmeans	Lsmeans	s.e.	P-value	Lsmeans	Lsmeans	s.e.	P-value
Feed efficiency traits
	ADFI (g)	1,748	2,057	61	**	2,073	1,939	68	NS
	ADG (g/j)	385	395	17	NS	407	406	15	NS
	eBW (kg)	50.6	51.5	1.9	NS	54.0	53.0	1.4	NS
	BFT (mm)	6.97	7.42	0.30	NS	7.64	6.96	0.29	NS
	MD (cm)	2.72	2.70	0.07	NS	2.70	2.77	0.04	NS
	RFI	−135.7	+130.9	26.7	***	−67.0	+29.9	43.6	NS
Feeding behavior traits
At visit level	FI/V (g)	147	137	13	NS	170	159	13	NS
	FD/V (min)	4.0	3.1	0.3	NS	3.1	4.7	0.3	***
	FR (g/min)	38.6	44.6	3.5	NS	55.1	33.7	2.1	***
At day level	FI/D (g)	1.916	2.197	91	*	2.260	2.085	104	NS
	FD/D (min)	51.7	51.7	3.9	NS	41.1	63.2	3.1	***
	NV/D	13.4	17.9	1.6	NS	13.9	13.7	1.0	NS

RFI-BV, residual feed intake breeding values; FR-BV, feeding rate breeding values; ADFI, average daily feed intake; ADG, average daily gain; eBW, bodyweight at the end; BFT, backfat thickness; MD, muscular fat; FI/V and FI/D, feed intake at visit and day levels, respectively; FD/V and FD/D, feeding duration at visit and day levels, respectively; FR, feeding rate; NV/D, number of visits per day.

***P < 0.001, **P < 0.01, *P < 0.05; NS, non-significant; in bold, significant differences.