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a
1000
900
800
700
600
500
400
300
200
-5 -4 -3 -2 -1 1 2 3 4 5 6 7 8 9 10 11 12 13 14
C
T
Weeks from parturition
b
120
A
100
A
A
80
A
A
60
A
A
A
B
A
B
40
A
B
B
B B
A
B B
20
B
B
B
0
-5 -4 -3 -2 -1 1 2 3 4 5 6 7 8 9 10 11 12 13 14
Weeks from parturition
C
T
Fig. 4.1 (a) Mean (
SD) plasma concentrations of NEFA (
Eq/L) in cows subjected to different
m
dry period lengths. (b) Mean (
SD) plasma concentrations of IGF-I (ng/mL) in cows subjected to
different dry period lengths. ( A,B P
0.01)
4.4 Discussion
The reduction of the dry period to 5 weeks resulted in significant differences in the
resumption of ovarian activity within 14 weeks PP in terms of time (34.5 vs.
46.9 days), but not numerically (76.9 vs. 75.0%). These results partially differ
from data reported by Watters et al. ( 2009 ), who recorded, after a dry period of
34 days, a shorter interval between calving and first ovulation (35 vs. 43 days) and
also a higher ovulation rate at 70 days of lactation (92 vs. 82%).
The pattern of NEFA plasma concentrations did not change significantly
between the two treatment groups, which is in contrast to what was reported by
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