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OJVRTM
Online Journal of Veterinary Research©
Volume 16 (4):182-194, 2012. Redacted
2017.
Effect of
progesterone supplementation on late embryonic survival in Holstein dairy cows.
Aarabi N1*, Hovareshti
P2, Ghasemzadeh-Nava H2, Mohammadsadegh M3
1Department of Theriogenology,
Faculty of Specialized Veterinary Sciences, Science and Research Branch,
Islamic Azad University, 2Department of Theriogenology,
Faculty of Veterinary Medicine, University of Tehran,3Department of
Clinical Sciences, Faculty of Veterinary Medicine, Garmsar
Branch, Islamic Azad university , Garmsar, Iran.
ABSTRACT
Aarabi N, Hovareshti P, Ghasemzadeh-Nava H,
Mohammadsadegh M., Effect of progesterone
supplementation on late embryonic survival in Holstein dairy cows, Online J Vet
Res., 16 (4):182-194, 2012. Embryonic
mortalities after maternal recognition of pregnancy and placentation are a
significant problem in dairy cows. Effects of progesterone supplementation at day 28 of pregnancy on
late embryonic death in dairy cows is reported. Eighty lactating dairy
cows were given 1.9 mg progesterone CIDR for 14 days and another 80 untreated
were used as controls. Pregnancy and
serum progesterone levels were determined on Days 28-30 and 45, respectively,
and estrogen concentrations were assayed on Days 28-30 after Artificial insemination(AI) in both groups. Serum progesterone concentrations increased
(P < 0.01) on Day 45 after AI in cows treated with CIDR (8.69ng/ml ± 1),
compared with controls (8.2±ng/ml±1) but there was no relationship between
estrogen levels on Days 28-30 and pregnancy loss on Day 45 in any group. Cows with two CLs did not have greater
concentrations of progesterone than cows with one CL. Milk production and size
of CL did not affect pregnancy retention. Pregnancy rate was not significantly
different between Days 28-30 and 45 (73% and 85% in control and CIDR groups
respectively), although in the treatment group, serum progesterone
concentrations increased significantly 14 days after starting the treatment,
compared to the control group. It was concluded that progesterone
supplementation on days 28-30 of pregnancy might reduce late embryonic death in
dairy cows.
Keywords: CIDR; Corpus luteum; Progesterone; Estrogen;
Pregnancy loss; Cattle
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