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Table 6 Estimated effects of different factors on average herd milk SCC (somatic cell count) in Finland

From: Prevalence of subclinical mastitis in Finnish dairy cows: changes during recent decades and impact of cow and herd factors

Comparison

99.9% CI

p value

Estimate

Lower

Upper

1991 vs. 2001

1.246

1.121

1.385

<0.001

1991 vs. 2010

1.630

1.437

1.849

<0.001

2001 vs. 2010

1.308

1.147

1.492

<0.001

Herd milk yield (100 kg)

0.990

0.989

0.990

<0.001

Herd milk yield (100 kg, 1991)

0.987

0.986

0.988

<0.001

Herd milk yield (100 kg, 2001)

0.989

0.988

0.990

<0.001

Herd milk yield (100 kg, 2010)

0.993

0.992

0.994

<0.001

Average herd size

1.007

1.006

1.008

<0.001

Average herd size (1991)

1.010

1.008

1.012

<0.001

Average herd size (2001)

1.007

1.006

1.009

<0.001

Average herd size (2010)

1.004

1.003

1.005

<0.001

South vs. West

1.011

0.987

1.035

0.236

South vs. North

1.118

1.089

1.148

<0.001

South vs. East

1.100

1.074

1.127

<0.001

West vs. North

1.106

1.083

1.129

<0.001

West vs. East

1.088

1.069

1.108

<0.001

North vs. East

0.984

0.964

1.005

0.051

  1. The estimated effects (multivariate ANO VA model) of the dif ferent pre-determined factors on the average milk SCC of herds included in the Finnish national health monitoring and milk recording system in 1991, 2001 and 2010 (observations used 41,503). Interactions between years and variables are presented on separate lines. All the included factors were tested statistically significant with Type III tests for fixed effects
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Acta Veterinaria Scandinavica

ISSN: 1751-0147