STUDIES ON ESTROUS BEHAVIOUR AND ESTROUS CYCLE RELATED ENDOCRINE PROFILE OF GADDI GOATS
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Date
2015-11-30
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CSKHPKV, Palampur
Abstract
ABSTRACT
Ten adult dry and non-pregnant Gaddi does were used in the present study for estrous
behaviour and estrous cycle related endocrine profile. The study was conducted during
short days under natural photoperiod from October, 2014 to February, 2015. All the does
were induced by PG (Iall group), four of which were investigated in the subsequent
spontaneous estrous cycle (S group). Information on the later set of goats during induced
estrus (from the Iall group) was also used and categorized in a third group (I) to draw a
comparison of estrous behaviour characteristics and endocrinology parameters between S,
I and Iall. The endocrinology determinants were evaluated in peripheral blood plasma
collected from estrus onset and every 3 hours thereafter till termination of estrus; in
addition, day 7 and day 14 blood samples were also evaluated. A comparison of estrous
behaviour characteristics was also made between confined (C) versus grazing (G)
conditions. The average time interval from PG administration to estrous onset was
76.1±3.8 hours. Standing to be mounted, biting of estrus female, sniffing of vulva and tail
flagging were most frequent signs characterizing onset of estrus, irrespective of PG
injection or housing conditions. Unlike G condition, where all estrous signs peaked at 3 to
3.5 hours after estrous onset, all the other estrous behaviour signs attained peak frequency
at 6 to 12.5 hours post estrous onset in S, I and Iall groups and C condition. Overall, estrous
expression was better in S estrus and in C condition compared to their respective
corresponding groups. There was no significant difference in estrous duration, estrous
onset to ovulation and follicular diameter of S versus I versus Iall groups (28.4±1.4 versus
32.0±5.3 versus 30.6±4.1 h, 23.9±2.1 versus 28.5±2.7 versus 24.0±5.6 h and 9.8±0.6
versus 9.3±0.5 versus 9.5±0.5 mm, respectively). Double ovulation was present in one goat
of the I group. There was no significant difference in ultrasonography assisted ovulatory
and other associated endocrine determinants between the S, I and Iall groups. Estradiol17β,
LH peak concentration, their timings from estrous onset, estradiol- 17β peak to
ovulation interval and LH peak to ovulation interval did not differ significantly in all the
three groups. The day 7 and day 14 plasma progesterone concentrations did not differ and
the average values ranged from 6.5±1.1 to 7.2±1.9 ng/ml at day 7 and 10.9±2.6 to 12.4±2.1
ng/ml at day 14 in S, I and Iall groups. Genital discharge fern pattern differed with stage of
estrus. Typical fern pattern coincided with peak frequency of estrous behaviour signs
except under G condition, where the peak per se occurred much early. Induction of estrus
did not affect ovulatory and endocrine characteristics.
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