1. A new experiment was done to test effect of X-Zelit® on
non-problem herds
Every second dry cow was treated with X-Zelit® and
every second cow was control object
X-Zelit® Control
(Number of cows) (Number of cows)
1st Lactation 84 103
2nd Lactation 74 66
3rd Lactation 55 48
Total 213 217
Making Milk Fever History

2. Effects of X-Zelit® supplementation
on milk yield
X-Zelit® Control Difference
(kg ECM) (kg ECM) (Kg ECM)
1st Lact. 30.1 29.8 + 0.3
2nd Lact. 40.6 39.4 + 1.2
3rd lact. 41.0 39.7 + 1.3
36.0±0.29 s 35.0±0.29 s
Average values during the first 100 days in milk
Summary of trials on commercial dairy farms
supplementing X-Zelit at 0.5 kgs head/day
Making Milk Fever History

3. Effects of X-Zelit® supplementation
on Somatic Cell Counts (SCC)
X-Zelit® Control Dif.
Geometric mean Geometric mean
(SCC x 1000) (SCC x 1000)
1st Lact. 52 52 -0
2nd Lact. 64 70 -8%
3rd lact. 94 113 -17 %
No overall difference was found between groups, but a tendency for lower cell count in
X-Zelit group was found for multiparous cows (P<0.1)
Making Milk Fever History

4. Effects of X-Zelit® supplementation
on various diseases
X-Zelit® Control P - values
(NoControl
of obs.) X-Zelit®
(No of obs.)
Clinical milk fever (SCC)
0 3 (SCC)= 0.12
P
1st Lactation
Mastitis 186,000
61 54 -100,000 0.47
P=
2nd Lactation
Retained placenta 300,000
15 16 -26,000 0.91
P=
Metritis Lactation
3rd+ 596,000
29 47 -264,000 0.03
P=
Making Milk Fever History

5. Costs of various disorders closely
related to hypocalcaemia (values used in budgets in
DK)
Disorder
Milk fever
9 times increased risk of ketosis
6 times increased risk of calving difficulties
4 times increased risk of displaced abomasum
3 times increased risk of retained placenta
2 times increased risk of metritis
Making Milk Fever History