Table 3 Parameter estimates (standard error in parenthesis) for the feed conversion ratio (FCR) in each company studied^a

Intercept

2.26 (0.10)^***

3.09 (0.21)^***

2.78 (0.25)^***

2.16 (0.13)^***

2.60 (0.12)^***

2.54 (0.06)^***

2.41 (0.12)^***

2.26 (0.11)^***

Autonomous community

 Cataluña

S

U

0.09 (0.05)^****

U

U

U

S

S

 Castilla y León

S

U

A

U

U

U

S

S

 Valencia

S

U

- 0.06 (0.06)

U

U

U

S

S

 Other

S

U

A

U

U

U

S

S

 Aragón

S

U

–

U

U

U

S

S

Trimester of placement

 Jan-Feb-Mar

A

−0.24 (0.05)^***

A

S

−0.09 (0.03)^**

S

S

−0.03 (0.12)

 Apr-May-Jun

−0.03 (0.02)^*

−0.33 (0.04)^***

−0.07 (0.04)^****

S

−0.02 (0.03)

S

S

0.15 (0.09)

 Jul-Aug-Sep

A

−0.31 (0.05)^***

A

S

−0.01 (0.03)

S

S

0.30 (0.10)^**

 Oct-Nov-Dec

–

–

–

S

–

S

S

–

BREGENSEG^c

 Pietrain – Male – Mixed-sex

U

–

–

U

U

U

U

–

 Pietrain – Male – Split-sex

U

A

A

U

U

U

U

0.24 (0.10)^*

 White – Male – Mixed-sex

U

A

0.04 (0.06)

U

U

U

U

0.57 (0.34)^****

 White – Barrow – Mixed-sex

U

−0.05 (0.05)^****

0.15 (0.06)^**

U

U

U

U

0.53 (0.23)^*

 Duroc – Barrow – Mixed-sex

U

A

0.13 (0.07)^****

U

U

U

U

0.83 (0.26)^**

Circovirus vaccine

 No

0.12 (0.02)^***

U

S

U

U

U

U

S

 Yes

–

U

S

U

U

U

U

S

Number of pig origins

 One origin

S

S

−0.10 (0.06)^****

U

U

U

−0.04 (0.02)^****

−0.05 (0.01)^**

 More than one origin

S

S

–

U

U

U

–

–

Herd age

 <10 years

A

S

U

–

S

–

S

A

 10 to 30 years

A

S

U

0.50 (0.16)^**

S

0.07 (0.03)^*

S

A

 >30 years

A

S

U

A

S

A

S

A

Type of feeder

 Multi-space

U

S

U

U

S

S

S

0.07 (0.02)^***

 Single-space

U

S

U

U

S

S

S

0.06 (0.02)^***

 Single-space with drinker

U

S

U

U

S

S

S

–

Routes utilized to perform treatments

 Feed

U

S

U

U

U

A

U

A

 Feed + Water

U

S

U

U

U

A

U

A

 Feed + Water + Injection

U

S

U

U

U

A

U

A

Water source in the farm

 Well

S

S

A

U

A

U

U

A

 River

S

S

A

U

A

U

U

A

 Other

S

S

A

U

−0.04 (0.02)^****

U

U

A

 Public supply

S

S

A

U

–

U

U

A

Number of animals placed

 <800 pigs

–

S

–

S

A

S

S

S

 800-2000 pigs

−0.04 (0.02)^*

S

0.09 (0.06)

S

S

S

S

S

 >2000 pigs

−0.01 (0.02)

S

0.16 (0.07)^*

S

S

S

S

S

Initial body weight

0.02 (0.005)^***

−0.004 (0.009)

−0.001 (0.01)

0.03 (0.008)^***

0.005 (0.01)

0.001 (0.003)

0.02 (0.005)^***

0.02 (0.01)^***

Trimester * Circovirus vaccine

 Apr-May-Jun / No vaccinated

0.14 (0.04)^***

U

U

U

U

U

U

U

 / Vaccinated

–

U

U

U

U

U

U

U

 Oct-Nov-Dec / No vaccinated

–

U

U

U

U

U

U

U

 / Vaccinated

–

U

U

U

U

U

U

U

Initial body weight * Herd age

 Initial body weight / < 10 years

U

U

U

–

U

U

U

U

 / 10 to 30 years

U

U

U

−0.03 (0.01)^**

U

U

U

U

Initial body weight * Trimester

 Initial body weight / Jan-Feb-Mar

U

U

U

U

U

U

U

−0.0005 (0.006)

 / Apr-May-Jun

U

U

U

U

U

U

U

−0.01 (0.005)^*

 / Jul-Aug-Sep

U

U

U

U

U

U

U

−0.02 (0.005)^**

 / Oct-Nov-Dec

U

U

U

U

U

U

U

–

Trimester of placement * BREGENSEG

 Jan-Feb-Mar / Pietrain – Male – Mixed-sex

U

–

U

U

U

U

U

U

 / White – Barrow – Mixed-sex

U

0.23 (0.07)^***

U

U

U

U

U

U

 Apr-May-Jun / Pietrain – Male – Mixed-sex

U

–

U

U

U

U

U

U

 / White – Barrow – Mixed-sex

U

0.20 (0.09)^*

U

U

U

U

U

U

 Jul-Aug-Sep / Pietrain – Male – Mixed-sex

U

–

U

U

U

U

U

U

 / White – Barrow – Mixed-sex

U

0.28 (0.08)^***

U

U

U

U

U

U

 Oct-Nov-Dec / Pietrain – Male – Mixed-sex

U

–

U

U

U

U

U

U

 / White – Barrow – Mixed-sex

U

–

U

U

U

U

U

U

Initial BW * BREGENSEG

 Initial BW / Pietrain - Male - Mixed-sex

U

U

U

U

U

U

U

–

 / Pietrain - Male - Split-sex

U

U

U

U

U

U

U

−0.01 (0.005)^**

 / White - Male - Mixed-sex

U

U

U

U

U

U

U

−0.02 (0.02)

 / White - Barrow - Mixed-sex

U

U

U

U

U

U

U

−0.02 (0.01)^****

 / Duroc - Barrow - Maxed-sex

U

U

U

U

U

U

U

−0.03 (0.01)^*