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Table 4 Estimates with corresponding confidence intervals (95% CI) and P-values for the milk production parameters milk yield (kg/cow/day), protein content (%) and fat content (%) from the multivariable linear mixed model

From: The effect of patent Dictyocaulus viviparus (re)infections on individual milk yield and milk quality in pastured dairy cows and correlation with clinical signs

Production trait

 

Milk yield

Protein content

Fat content

 

Estimate (95% CI)

P-value

Estimate (95% CI)

P-value

Estimate (95% CI)

P-value

Intercept

 

16.69 (13.46; 19.93)

< 0.0001

4.06 (3.87; 4.24)

< 0.0001

4.87 (4.49; 5.25)

< 0.0001

FLC

FLC negative

1.62 (0.07; 3.18)

0.0406

-0.05 (-0.15; 0.05)

0.3666

-0.05 (-0.25; 0.15)

0.6092

 

FLC positive

Baseline

 

Baseline

 

Baseline

 

Parity

1

-3.49 (-4.38; -2.59)

< 0.0001

-0.00 (-0.06; 0.05)

0.9508

-0.02 (-0.13; 0.10)

0.7946

 

2

-1.64 (-2.55; -0.72)

0.0005

0.09 (0.04; 0.15)

0.0017

0.03 (-0.09; 0.14)

0.6284

 

3

0.80 (-0.15; 1.76)

0.1000

0.07 (0.01; 0.13)

0.0290

-0.06 (-0.18; 0.06)

0.2918

 

4

0.71 (-0.33; 1.75)

0.1790

0.09 (0.02; 0.15)

0.0075

0.06 (-0.07; 0.19)

0.3784

 

> 4

Baseline

 

Baseline

 

Baseline

 

Lactation stage

DIM ≤ 14

10.20 (8.68; 11.71)

< 0.0001

-0.28 (-0.37; -0.18)

< 0.0001

-0.30 (-0.49; -0.10)

0.0026

 

DIM 14-77

11.11 (10.39; 11.84)

< 0.0001

-0.62 (-0.67; -0.58)

< 0.0001

-0.63 (-0.72; -0.54)

< 0.0001

 

DIM 78-140

8.35 (7.61; 9.08)

< 0.0001

-0.51 (-0.56; -0.47)

< 0.0001

-0.58 (-0.68; -0.49)

< 0.0001

 

DIM 141-231

4.65 (4.03; 5.27)

< 0.0001

-0.25 (-0.29; -0.21)

< 0.0001

-0.31 (-0.39; -0.23)

< 0.0001

 

DIM ≥ 232

Baseline

 

Baseline

 

Baseline

 

Genetic line

DSN

-1.02 (-2.73; 0.69)

0.2406

-0.05 (-0.16; 0.05)

0.3008

-0.28 (-0.49; -0.08)

0.0067

 

Crosses

0.33 (-1.93; 2.58)

0.7744

0.02 (-0.12; 0.16)

0.7717

-0.10 (-0.38; 0.19)

0.5039

 

HF-GHm

1.45 (0.21; 2.68)

0.0223

-0.20 (-0.27; -0.12)

< 0.0001

-0.40 (-0.56; -0.25)

< 0.0001

 

HF-GHp

0.94 (-0.64; 2.52)

0.2434

-0.15 (-0.24; -0.05)

0.0044

-0.33 (-0.52; -0.13)

0.0012

 

HF-NZ

Baseline

 

Baseline

 

Baseline

 

Test-day season

< September

1.39 (0.79; 1.98)

 

-0.23 (-0.27; -0.19)

< 0.0001

-0.26 (-0.34; -0.19)

< 0.0001

 

≥ September

Baseline

< 0.0001

Baseline

 

Baseline

 

Time span

≤ 8

-1.61 (-3.55; 0.31)

0.0998

-0.12 (-0.23; -0.01)

0.0581

-0.05 (-0.28; 0.18)

0.6782

 

> 8 and ≤ 16

-3.71 (-5.54; -1.88)

< 0.0001

-0.09 (-0.20; 0.01)

0.1228

0.11 (-0.11; 0.33)

0.3169

 

> 16 and ≤ 24

-2.72 (-4.47; -0.96)

0.0024

-0.04 (-0.14; 0.07)

0.5639

0.18 (-0.03; 0.39)

0.1014

 

> 24 and ≤ 32

-2.49 (-4.67; -0.51)

0.0136

-0.05 (-0.17; 0.07)

0.5143

0.19 (-0.05; 0.43)

0.1180

 

> 32

Baseline

 

Baseline

 

Baseline

 

Random effects

 

Estimate

 

Estimate

 

Estimate

 

Farm

 

7.97

 

0.01

 

0.06

 

Cow

 

9.94

 

0.03

 

0.15

 

Residual

 

13.41

 

0.06

 

0.22

 
  1. Abbreviations: CI confidence interval, FLC binary defined faecal larvae count (FLC = 0 classified as ‘FLC negative’; FLC ≥ 1 classified as ‘FLC positive’) as a parameter for D. viviparus infection status