|
|
Open Access
Copyright: The authors. This article is an open access
article licensed under the terms of the Creative Commons Attribution License
(http://creativecommons.org/licenses/by/2.0) which permits unrestricted use,
distribution and reproduction in any medium, provided the work is properly
cited.
Original Research
3. Treatment
protocol with progesterone, estradiol and oxytocin
to improve conception rate and allows for early
diagnosis of pregnancy in black bengal goat -
D Sengupta, S Basu
Vet World. 2012; 5(5): 269-273
doi:
10.5455/vetworld.201 2.269-273
Abstract
This
work was performed to develop a treatment protocol that will
shorten the length of estrous cycle in mated goats those fail to
conceive, without reduction in conception rate. In experiment 1,
ninety goats (single parity, 1½ to 2 years age) were divided into
nine groups of ten goats each. On return to heat, all groups were
mated barring groups 1, 3 and 4. On days 3-5 of estrous,
progesterone was treated at the dose rate of 10 mg i.m (groups 3,
5 and 7) or 30 mg i.m. (groups 4, 6 and 8). Groups 7, 8 and 9
received estradiol (500 ìg i.m.; day 8) + oxytocin (10 IU i.m.;
day 9) treatment. Following treatments, the goats were observed
for heat and appearance of embryonic vescicles (EV) by
transabdominal ultrasonography. In experiment 2, group 2 (n=50)
was equal to group 8 of experiment 1 and group 1 (n=50) served as
control. The litter size and weight was recorded at birth. Early
progesterone treatment significantly (P<0.05) shortened the cycle
length in groups 3 (day 15) and 4 (day 17) respectively compared
to control (group 1; 21 days), whereas mated group 5 and 6 did not
have any difference in conception rate compared to control (group
2). In does of group 5 & 6, EVs were observed much earlier than
group 2. Estradiol + oxytocin treatment had no effect on
conception rate of group 8, while does of group 7 and 9 returned
to heat on day 12. In experiment 2, significant difference in
conception rate and percentage of single, double, triplet and
quadruplet born was observed between control and treated groups
while the mean litter weight born was non-significant. Thus early
pregnancy diagnosis can be done at by progesterone + estrogen
treatment that not only shortens the length of estrous cycle, if
the animals fail to conceive, but also improves the conception
rate.
Key
words: progesterone, estrogen, oxytocin, estrous cycle length,
pregnancy, Black Bengal goats
|
|
