Table 3.

Individual effects on lamb weight in the sheep.

Individual effect	Effect size (g)
Litter size...*
Twin	−692±40
Triplet	−1.40±0.04
Quad	−2.08±0.11
Year of birth	+97 to +555
2 barren seasons†	−769±60
Health (alive/dead)‡	−619±55
Parity 1	+351±36
Parity 1+	+0 to +300
Lamb sex**	+363±25
Late gestation energy intake	+207±3%
Fetal:maternal weight
Ewe BCS...#	%
Moderate (2.5-3.5)	−1.24±0.48
High (3.5+)	−2.33±0.84

Individual effects were calculated using REML estimates ±s.e.m.

^*Relative to a singleton.

^†Relative to not barren or 1 barren period.

^‡Lamb that survived.

^**Relative to female lambs.

^#Relative to ewe in low body condition score (BCS) at mating.