EFFECT OF PREOVULATORY FOLLICLE DIAMETER ON LUTEAL PROFILES AND PREGNANCY RATE IN CROSSBRED COWS
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Date
2016-12
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SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA
Abstract
ABSTRACT:
The aim of the research was to evaluate the effect of pre-ovulatory follicle
diameter on luteal profiles and conception rate in crossbred cows. Anestrus cows
(20) were divided randomly into two groups and assigned to Group I (Ovsynch;
n=10) and Group II (Ovsynch+CIDR; n=10). Cows of Group III (normal cycling;
n=10) served as natural control. The estrus induction efficiency was measured in
terms of onset of estrus post PGF2α administration, estrus response, duration of estrus and estrus intensity. Highest estrus response was observed in Group II (100 per cent) followed by Group I (90 per cent) respectively. Early onset of estrus after
PGF2α was observed in Group II (52.2±1.31 h) compared to Group I (58.1±0.50 h
cows. Estrus duration was observed to be 25.1±0.93 h, 24.8±0.85 h and 26.2±1.05 h
in different groups of cows respectively. Classifying the POF’s into different size
categories revealed that 70 per cent cows had POF diameter of 10–12 mm (mean
11.1±0.12), 20 per cent cows had POF diameter of >12–14 mm (mean 12.9±0.25)
and only 10 per cent cows had POF diameter of >14 mm (mean 14.8±0.33). The
post ovulatory luteal diameter increased significantly (P<0.05) with increase in POF
diameter. The plasma progesterone concentration on day 7 post AI increased
significantly (P<0.05) with increase in POF diameter. The pregnancy rate was
observed to be significantly highest (100.0 per cent) when the follicle diameter was
in the range of >12 to 14 mm compared to that of 10 to 12mm (61.9 per cent) or that
of >14 mm (66.6 per cent). The post ovulatory luteal diameter (mm) and plasma
progesterone concentration on day 7 post AI (ng/ml) increased significantly with
increase in pre-ovulatory follicle diameter. However the pregnancy rate was
significantly highest when the pre-ovulatory follicle diameter was >12 to 14 mm
compared to that of 10 to 12 mm diameter and >14 mm diameter. It may be
concluded that the pre-ovulatory follicle diameter may be used as an indicator for
predicting post-ovulatory luteal diameter, progesterone concentration on day 7 post
AI and subsequent pregnancy rate.
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