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Table 2 Model estimates (with standard error in brackets) from the poisson or negative binomial (NB) model estimates in 620 free-stalls and 192 tie-stalls cows using Proc Genmod in SAS.

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

Disease event

Intercept

Tie-stall

Herd size

Interaction tie-stall herd size

Dispersion (If NB fit)

Severe/moderate mastitis

-1.8233 (0.0918)xxx

0.0160 (0.0695)

-0.0060 (0.0031)0.005

 

0.4254 (0.0379)

All cases of mastitis

-1.2239 (0.0922)xxx

-0.3144 (0.2075)

-0.0124 (0.0032)xxx

0.0121 (0.0072)0.09

0.4188 (0.0325)

Teat injuries

-3.7139 (0.2233)xxx

0.6633 (0.1487)xxx

-0.0285 (0.0077)xxx

 

1.0733 (0.2602)

Ketosis

-3.7847 (0.2240)xxx

0.9649 (0.1520)xxx

-0.0189 (0.0076)x

 

1.8793 (0.2907)

Milk fever

-2.9452 (0.0391)xxx

0.0702 (0.0782)

  

0.2071 (0.0476)

Indigestions

-4.1680 (0.3249)xxx

-0.2089 (0.5558)

-0.0303 (0.0115)xx

0.0391 (0.0189)x

1.2651 (03637)

Retained placenta

-3.3586 (0.0539)xxx

-0.0812 (0.1126)

  

0.6680 (0.1071)

Abortions

-6.0659 (0.1622)xxx

-0.5325 (0.4113)

  

Poisson

Anoestrus

-4.4459 (0.1232)xxx

0.7085 (0.2334)xx

  

5.8928 (0.8265)

Metritis

-4.4742 (0.0859)xxx

-0.4554 (0.2016)x

  

1.1197 (0.3160)

Cystic ovaries

-4.8557 (0.1151)xxx

-0.4537 (0.2151)x

  

3.1334 (0.6429)

All diseases

-0.4513 (0.0812)xxx

-0.0461 (0.0620)

-0.0062 (0.0028)x

 

0.4869 (0.0282)

  1. x = p < 0.05, xx = p < 0.01, xxx = 0.001
  2. (Effect of free-stall = 0 in the models).