novel approaches to expression and detection of oestrus in dairy cows

P4 Concentration, ng/ml
P4 Concentration, ng/ml
P4 Concentration, ng/ml
P4 Concentration, ng/ml
25
20
15
10
5
0
Cow 520
20
18
16
14
12
10
8
6
4
2
0
Cow 412
Date
Date
45
40
35
30
25
20
15
10
5
0
Cow 604
16
14
12
10
8
6
4
2
0
Cow 288
Date
Date
Figure 5.6 (Cont.) Milk progesterone profiles from POC 1 of cows that did not come into oestrus, progesterone concentration (ng/ml) plotted against
date; cows 412 and 520 were both synchronised but did not come into oestrus, 125 cow 604 is pregnant with high progesterone and cow 288 is an open
cow (not pregnant), but is in the luteal stage of the oestrous cycle as shown by high progesterone concentration and records prior to trial