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Evaluation of Norgestomet, a synthetic progestogen, for inducing oestrus and subsequent fertility in heifers and post-partum anoestrus cows

Evaluation of Norgestomet, a synthetic progestogen, for inducing oestrus and subsequent fertility in heifers and post-partum anoestrus cows

Indian Veterinary Journal 78(10): 961-962

ISSN/ISBN: 0019-6479

Ten anoestrus Jersey and Jersey x Red Sindhi cows (n=5) and heifers (n=5) were used in the study. The ear implants containing 3 mg norgestomet (Crestar) were inserted near the base of ear and were kept in position for 9 days. A single intramuscular injection of 3 mg norgestomet and 5 mg estradiol valerate was given on the day of implant insertion. The animals were examined and inseminated at 72 and 96 h after withdrawal of implant. Pregnancy was confirmed 60 days post-insemination by rectal palpation. All the animals were detected in oestrus following rectal examination with only 4 animals exhibiting behavioural oestrus. The overall first insemination conception rate was 40%, with more cows (3/5) than heifers (1/5) conceiving.

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Accession: 003757558

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