June

 

July

 

September

Main Effects Pr>F

BreedY

LactationY

Time

Fat (%)

4.3 ±   0.3a

3.5 ±   0.1b

3.7 ±   0.1b

0.0008

NS

0.0021

 

 

 

 

 

 

 

Protein (%)

3.4 ±   0.1

3.3 ±   0.1

3.5 ±   0.1

NS

NS

NS

 

 

 

 

 

 

 

Milk Yield (kg/d)

28.0 ±   0.8a

23.3 ±   0.6b

21.0 ±   0.5c

0.0006

NS

<0.0001

 

 

 

 

 

 

 

VA (% of whole milk)

0.119 ±   0.014b

0.136 ±   0.005a

0.086 ±   0.005c

0.0100

0.0275

<0.0001

 

 

 

 

 

 

 

VA Yield (ml/d)

1.209 ±   0.064a

0.897 ±   0.036b

0.508 ±   0.024c

NS

NS

<0.0001

 

 

 

 

 

 

 

LA (% of whole milk)

0.101 ±   0.008a

0.076 ±   0.004c

0.080 ± 0.004bc

0.0036

NS

<0.0001

 

 

 

 

 

 

 

LA Yield (ml/d)

0.648 ±   0.027a

0.501 ±   0.022b

0.468 ±   0.012b

0.0040

NS

0.0006

 

 

 

 

 

 

 

CLA (% of whole milk)

0.051 ±   0.004a

0.040 ±   0.002b

0.030 ±   0.002c

NS

0.0003

<0.0001

 

 

 

 

 

 

 

CLA Yield (ml/d)

0.012 ±   0.002a

0.009 ±   0.001b

0.007 ±   0.000c

NS

NS

<0.0001

zMeans ± SEM, n=49. Different superscript letters indicate differences over time, by contrasts (p<0.05). Main effects were for Breed (Fleckvieh, Holstein, Jersey), Lactation (early, mid late) and Time (June, July, September). y means for significant main effects due to breed or lactation are provided in the text. NS=not significant.
Table 2: Milk macronutrient composition, milk yield and CLA yield during the grazing periodz