Table 1 Fixed effects tested in the analysis of the different traits

Genotype

*

*

*

*(only for twin litters)

Flock

*

*

*

*

Year of lambing

x

-

*

x

Season of lambing

x

-

*

-

Month of lambing

*

-

*

*

Season of AI

-

x

-

-

Birth type

x

x

*

x

Rearing mode

*

*

*

*

Rearing type

*

x

*

x

Interval since last lambing

*

*

*

-

LS at previous lambing

*

-

*

-

LS suckled at previous lambing

-

*

-

-

Age at 1^st lambing (3 classes)

*

-

*

x

Lambing rank

*

-

*

*

Oestrus type (natural, hormonal treatment)

*

-

-

-

Lamb effects

Sex

*

-

Birth type

*

*

Rearing type

*

-