Retention rate in cows and heifers of intravaginal silastic coils impregnated with progesterone

Calving rate of cows following insemination after a 12-day treatment with silastic coils impregnated with progesterone.

Farm trials were conducted to determine if the calving rate was different for control cows inseminated with frozen semen at estrus in comparison to cows treated with progesterone for 12 days and bred at the ensuing estrus. Intravaginal silastic coils impregnated with progesterone were used and an injection of 5 mg estradiol benzoate and 50 mg progesterone in corn oil was given at the time of in...

Control of estrus and progesterone levels in heifers given intravaginal progesterone coils and injections of progesterone and estrogen.

Fifty-three mature Hereford-cross heifers, which were between day 0 and 3 of the estrous cycle, each had silastic coils containing 2.1 g progesterone inserted into the vagina where they remained for 12 days. Animals were assigned to treatment groups and were injected with (1) 5 mg estradiol benzoate, (2) as (1) + 50 mg progesterone or (3) as (1) + 200 mg progesterone at the time of insertion of...

Comparison of two intravaginal progesterone releasing devices in lactating dairy cows: blood progesterone profile and field

Estrus synchronization and conception rate after a progesterone releasing intravaginal device (PRID) treatment from the early luteal phase in heifers.

The objective of the present study was to evaluate estrus synchronization and conception rate after progesterone releasing intravaginal device (PRID) treatment from the early luteal phase in the presence or absence of estradiol benzoate (EB) in heifers. Heifers (n=11) were assigned randomly to two treatments; insertion of a PRID containing 1.55 g progesterone with a capsule attached including 1...

Induced and Synchronized Estrus in Cattle: Dose Titration of Estradiol Benzoate in Peripubertal Heifers and Postpartum Cows After Treatment with an Intravaginal Progesterone-Releasing Insert and Prostaglandin F2a

Peripubertal beef heifers (n = 57) and postpartum multiparous cows (n = 52) were used to determine the optimal dose of estradiol benzoate (EB) to induce and synchronize estrus after treatment with intravaginal progesterone inserts (IVP4, EAZI-BREED CIDR) . All females received an IVP4 for 7 d (d 0 = insertion day) with a 25-mg injection of PGF2a (Lutalyse) on d 6. At 24 to 30 h after IVP4 re...