PMID: 11928925Apr 4, 2002Paper

Effect of oestrous synchronization with estradiol 17beta and progesterone on follicular wave dynamics in dairy heifers

Reproduction in Domestic Animals = Zuchthygiene
A Garcia, M Salaheddine

Abstract

An experiment was designed to evaluate the effects of estradiol-17beta (E17beta) on follicular wave dynamics and ovulatory response in Holstein heifers receiving either a progestogen ear-implant (Crestar; Intervet International b.v. Boxmeer, The Netherlands) or an intravaginal progesterone-releasing device [controlled internal drug release-bovine device (Eazibreed, CIDR-B; Bodinco BV, Alkmaar, The Netherlands)]. For comparison, another group of heifers was also synchronized using Crestar plus an injection of estradiol valerate (EV) and norgestomet as recommended by the pharmaceutical company. Twenty 20-22-month-old cycling Holstein heifers were allocated to one of the following treatment groups at random stages of the oestrous cycle: (I) simultaneous insertion of Crestar and intramuscular injection of 3 mg norgestomet and 5 mg EV (Crestar 9 + EV 9); (II) simultaneous insertion of Crestar and intramuscular injection of 5 mg E17beta (Crestar 9 + E17beta 9); (III) insertion of Crestar followed 2 days later by intramuscular injection of 5 mg E17beta (Crestar 9 + E17beta 7); or (IV) insertion of CIDR-B device followed 2 days later by intramuscular injection of 5 mg E17beta (CIDR 9 + E17beta 7). The CIDR-B or Crestar implants were re...Continue Reading

References

Dec 1, 1991·Biology of Reproduction·K L Macmillan, W W Thatcher
Mar 1, 1991·Journal of Reproduction and Fertility·J C KoO J Ginther
Mar 1, 1990·Journal of Animal Science·K G Odde
Mar 1, 1984·Theriogenology·R A Pierson, O J Ginther

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