Progesterone Level During The Heat Cycle - DeLaval Herd Navigator precision analytics 100 Instruction Book

DeLaval Herd Navigator™ precision analytics 100
General description
(A)
30
25
20
15
10
5
30
-10 -5
Fig. 9: Progesterone level during the heat cycle.
A: Progesterone (ng/ml)
B: Days from the first heat
C: Heat alarm
© DeLaval 2021.
2021-05-10, Version 3
4.3 Progesterone level during the heat
0 5 10
21 (44)
cycle
15 20
Progesterone is a reproductive hormone pro-
duced by the ovaries and possible to detect in
milk. The concentration of progesterone increa-
ses and decreases according to a cyclic pattern.
By taking repeated samples from a cow during
the lactation, it is possible to detect heat, preg-
nancy and fertility problems like prolonged post-
partum anoestrus, follicular cyst, and luteal cyst.
The progesterone level in blood and milk always
drops before a cow goes into heat. Conse-
quently, a heat alarm is triggered when the pro-
gesterone level falls below a certain threshold (5
ng/ml). This indicates that the cow will be in heat
(B)
25
(C)
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