volume 43 issue 4 (december 2009) : 293-294
EFFECT OF ILIREN AND NORGESTOMET ON SYNCHRONIZATION OF OESTRUS IN COWS*
1Department of Animal Physiology, College of Veterinary Science,
Assam Agricultural University, Khanapara, Guwahati-781 022, India.
ABSTRACT
Fifteen healthy cyclic indigenous cows of Assam at first and/or second lactation were randomly
divided into three groups viz. I, II and III, each comprising of five cows. Group I cows were kept
as untreated control. The cows under group II and III were treated with “Iliren” (a PGF2 analogue)
and “Crestar” (3 mg Norgestomet, 5 mg Estradiol valerate) respectively. All experimental animals
of group II exhibited oestrus between 96 and 108 hrs with a mean of 99.00 ± 3.00 hrs following
treatment while 4 cows under group III, responded to treatment. Mean interval between withdrawal
of Crestar ear implant and exhibition of oestrus was 29.80 ± 0.91 hrs with a range from 24 to 48
hrs. The physical symptoms of oestrus were similar in hormonally treated and control animals.
Duration of oestrus was found to be significantly higher (p
divided into three groups viz. I, II and III, each comprising of five cows. Group I cows were kept
as untreated control. The cows under group II and III were treated with “Iliren” (a PGF2 analogue)
and “Crestar” (3 mg Norgestomet, 5 mg Estradiol valerate) respectively. All experimental animals
of group II exhibited oestrus between 96 and 108 hrs with a mean of 99.00 ± 3.00 hrs following
treatment while 4 cows under group III, responded to treatment. Mean interval between withdrawal
of Crestar ear implant and exhibition of oestrus was 29.80 ± 0.91 hrs with a range from 24 to 48
hrs. The physical symptoms of oestrus were similar in hormonally treated and control animals.
Duration of oestrus was found to be significantly higher (p
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Indian Journal of Animal Research
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