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Table 4 Model estimates (with standard error in brackets) from the mixed models (ProcMixed in SAS) regarding test-day milk yield for cows in parity 1 (73,878 observations) and parity 3 (31,259 observations).

From: Housing system and herd size interactions in Norwegian dairy herds; associations with performance and disease incidence

Parameter

Class

Estimate (β), parity 1

Estimate (β), parity 3

Intercept

 

10,9556 (0,4407)xxx

19,3046 (1,3906)xxx

Dim (days in milk)

Continuous

-0,08280 (0,001694)xxx

-0,1511 (0,004225)xxx

Lndim

Continuous

3,2422 (0,09681)xxx

5,0496 (0,2793)xxx

Housing (tie-stalls)

1

3,9006 (0,6385)xxx

5,4013 (0,9872)xxx

Housing (free-stalls)

2

0

0

Dim*housing

1

0,003912 (0,000921)xxx

0,009284 (0,001902)xxx

Dim*housing

2

0

0

Lndim*housing

1

-0,4517 (0,0763)xxx

-1,0271 (0,1472)xxx

Lndim*housing

2

0

 

CI (calving interval)

Continuous

0,004768 (0,001409)xxx

0,008638 (0,001908)xxx

Dim*CI

Continuous

0,000043 (0.0000003)xxx

0,000101 (0,0000010)xxx

Lndim*CI

Continuous

0,0000007 (0,0000002)x

-0,00145 (0,000616)x

Dim* cows (herd no of cow-years)

Continuous

-0,00010 (0,000038)xx

-0,00018 (0,000079)x

Lndim*cows

Continuous

0,02167 (0,003022)xxx

0,02182 (0,006012)xxx

Cows

Continuous

-0,04516 (0,01325)xxx

-0,2022 (0,07613)xx

Cows*cows

Continuous

0,001119 (0,000142)x

0,002519 (0,001139)x

Cows*housing

1

-0,05597 (0,02091)xx

-0,05634 (0,03034)ns

Cows*housing

2

0

 
  1. x = p < 0.05, xx = p < 0.01, xxx = 0.001
  2. Random herd effect estimated to 19.0% in parity 1 and 19.8% in parity 3.
  3. Random lactation effect estimated to 3.8% in parity 1 and 2.3% in parity 3.