OESTRUS BEHAVIOUR IN NATURAL AND INDUCED OESTRUM IN DAIRY CATTLE BY PGF2α WITH GnRH AND hCG
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Date
2015
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Abstract
Thirty two apparently healthy, parous, cyclic crossbred cows were utilized for this
study. All the selected animals were randomly divided into 4 groups comprising of 8 animals
in each group namely control (Group l), PGF2α (Group-II), PGF2α+GnRH (Group-III), and
PGF2α+hG (Group-IV). Cows were artificially inseminated twice at an interval of 24 hours in
observed estrum. The time taken for the onset of oestrus was 70.50 ± 3.27, 68.00 ± 3.17
and68.25±2.21hrs in Group (II), Group (III) and Group (IV), respectively. The Duration of
oestrus in Group (I), Group (II), Group (III) and Group (IV) were 20.50 ± 0.41, 21.00 ± 0.47,
19.50 ± 0.33 and 19.25 ± 0.56 hours . The synchronized cows exhibited 8.33, 58.33 and
33.33 per cent of week, normal and intense oestrus, The administration of PGF2α causes rapid
regression of corpus luteum and brought down the blood progesterone level within 24 hours
after injection.
Description
TNV_IJSET_2015_4(1)243-247
Keywords
Veterinary Science