Reproductive Response of Beef Cows to Exogenous Progestogen, Estrogen and Gonadotropins at Various Stages Postpartum

Jg, Brown; Dw, Peterson; Wd, Foote

doi:10.2527/jas1972.352362x

Cited by 16 publications

(8 citation statements)

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“…These pregnancy rates were attained in cows in which 81% were anestrous at the beginning of the trial, which indicated that 1 mg of EB 24 to 30 h after IVP4 removal induced a fertile estrus in postpartum anestrous cows. These findings support those of Ulberg and Lindley (1960), Saiduddin et al (1968), Brown et al (1972), and Fike et al (1997), who reported that progesterone treatment followed 24 to 72 h later by an injection of estradiol successfully induced a fertile estrus in heifers and cows.…”

Section: Pregnancy Ratessupporting

confidence: 89%

“…Beef cattle treated with exogenous progesterone for 9 d followed by an estradiol injection 48 h later were reported to have excellent estrous synchrony regardless of whether they were anestrous or had started estrous cycles (Ulberg and Lindley, 1960;Brown et al, 1972). Fike et al (1997) and Johnson et al (1997) reported an increase in number of postpartum cows and yearling heifers showing estrous behavior when given an estradiol injection 24 to 30 h after a 7-d IVP4 treatment.…”

Section: Estrous Behaviormentioning

confidence: 99%

“…A single injection of estradiol-17b during the postpartum period hastened the onset of estrus and ovulation but reduced conception rates (Saiduddin et al, 1968). However, when an injection of estradiol was given to heifers and cows 24 to 72 h after the end of a 9-to-14-d progesterone treatment, estrous behavior and ovulation were induced without decreasing pregnancy rates (Ulberg and Lindley, 1960;Saiduddin et al, 1968;Brown et al, 1972). Recently, it was reported that in cows (Fike et al, 1997) and heifers (Johnson et al, 1997) treated with an intravaginal progesterone insert ( IVP4) for 7 d plus an injection of estradiol benzoate ( EB) 24 to 30 h after IVP4 removal, the EB increased the number of females exhibiting estrous behavior, compared with females not treated or treated with IVP4 only.…”

Section: Introductionmentioning

confidence: 99%

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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 F2alpha.

Lammoglia-Villagómez

Short

Bellows

et al. 1998

Journal of Animal Science

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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 PGF2alpha (Lutalyse) on d 6. At 24 to 30 h after IVP4 removal, females were randomly assigned to be injected subcutaneously with EB at the following doses: heifers 0, .2, .38, or .75 mg and cows 0, .25, .5, or 1 mg. Furthermore, seven heifers and seven cows from each dose group were bled every 4 h for 76 h starting at EB injection. Serum was collected and assayed for LH and estradiol-17beta (E2). Observations for signs of estrus were made twice daily for 21 d after removal of IVP4, and females were artificially inseminated 8 to 20 h after detection of estrus. The percentage of females showing estrous behavior was increased by EB (P < .04); the greatest response was at .38 mg in heifers (86%) and 1 mg in cows (100%). Dose x time interaction affected (P < .01) E2 concentrations in heifers and cows; the animals that received the higher doses of EB had greater E2 concentrations in a shorter time than those that received the smaller doses. The percentage of cows and heifers with an acute preovulatory LH release (peak LH) was affected by dose, with a linear (P < .01) and a quadratic (P < .01) response. Highest concentrations of LH during peak LH were affected by dose with a linear (P < .01) response in heifers and linear (P < .01) and quadratic (P < .08) responses in cows. Heifers receiving .38 mg and cows receiving .5 and 1 mg of EB had the highest peak LH. Time to LH peak had a linear (P < .03) response in heifers and had linear (P < .04) and quadratic (P < .05) responses in cows. Pregnancy rate was affected (P < .02) in heifers by whether or not they were anestrous before IVP4 treatment (those with estrous cycles = 52% vs those that were anestrous = 22%) and in cows by dose of EB (P < .01; 8, 23, 21, and 67% for 0, .25, .5, and 1 mg, respectively). In conclusion, in females treated with IVP4 and PGF2alpha to induce and synchronize estrus, an injection of EB increased concentrations of E2 and LH and increased number of animals showing estrus. Also, EB increased pregnancy rates in cows. Optimal responses were at .38 mg EB for heifers and at 1 mg EB for cows.

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Section: Pregnancy Ratessupporting

confidence: 89%

Section: Estrous Behaviormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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 F2alpha.

Lammoglia-Villagómez

Short

Bellows

et al. 1998

Journal of Animal Science

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“…Treatment with estradiol increased the cumulative proportion of cows ovulating by d 35 of the experimental period by 29 percentage points. Similar observations have been reported by Saiduddin et al (1968) and Brown et al (1972), who showed that a single injection of estradiol, alone or 48 h after administration of a progestogen, was more effective in reducing the interval to estrus and ovulation if given during mid-postpartum. Treatment of cows on d 10 to 17 postpartum with one or two estradiol implants similar to those used in the present experiment failed to alter the time of the first rise in progesterone following parturition (Peters, 1984).…”

Section: Resultssupporting

confidence: 88%

Ovulation in Postpartum Beef Cows Treated with Estradiol

Garcia-Winder

Lewis

Inskeep

1988

Journal of Animal Science

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The effect of implants of estradiol on initiation of ovarian cycles postpartum was studied in 201 anestrous beef cows. Cows from four farms were used over a 2-yr period in a 2 x 3 factorial arrangement of treatments with estradiol implants and stage postpartum as main effects. Cows were assigned at random within date of calving within farm to receive an ear implant containing estradiol-17 beta (24 mg) for 21 d or to serve as controls. Stages postpartum at implantation were divided into less than or equal to 25, 26 to 39, and greater than or equal to 40 d, three stages that should reflect potential changes in hypothalmic-hypophysial sensitivity to estradiol. Blood samples for determination of progesterone were obtained and rectal examinations of the ovaries performed at implant insertion, 14 d after insertion, at implant removal (d 21), and 14 d after removal (d 35) to assess ovulatory response to treatment. Circulating concentrations of estradiol on d 14 of treatment averaged 3.2 +/- 1.0 and 23.1 +/- 4.7 pg/ml for control and estradiol-treated cows, respectively. Compared with control cows, treatment with estradiol initiated after d 26 postpartum increased the proportion of cows that ovulated during the experimental period. No differences were seen in the average days postpartum when cows were first determined to have ovulated.

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“…Progestagen treatment, often with oestrogen, can also induce oestrus and ovulation in cattle after calving (Foote & Hunter, 1964;Brown, Peterson & Foote, 1972;Britt, Morrow, Kittok & Seguin, 1974;Lavoie & Moody, 1974). Silastic implants have proved to be an easier method of application of progesterone than repeated injections (Wishart & Young, 1974) and intravaginal progesterone-releasing devices are even more convenient for maintaining blood progesterone levels without the need for repeated injections or surgical interference (Roche, 1976b).…”

Section: Introductionmentioning

confidence: 99%

Effect of a progesterone-releasing intravaginal device on the milk progesterone levels, vaginal flora, milk yield and fertility of cyclic and non-cyclic dairy cows

Bulman¹,

McKibbin²,

Appleyard³

et al. 1978

Reproduction

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A progesterone-releasing intravaginal device (PRID) was inserted for 14 days into 10 lactating dairy cows at least 50 days after calving. Synchronization of oestrus was good and 5 of the cows conceived to a double insemination 48 and 72 h after PRID removal. In 9 cows vaginal infection was present when the PRID was removed but resolved spontaneously. The level of progesterone in the milk and the milk yield were similar to those in the 10 control animals. PRID treatment of 9 cows whose ovaries had remained inactive for at least 50 days after calving was followed by ovulation, as judged by the milk progesterone profile, in 8 animals after removal of the device.

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Reproductive Response of Beef Cows to Exogenous Progestogen, Estrogen and Gonadotropins at Various Stages Postpartum

Cited by 16 publications

References 0 publications

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 F2alpha.

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 F2alpha.

Ovulation in Postpartum Beef Cows Treated with Estradiol

Effect of a progesterone-releasing intravaginal device on the milk progesterone levels, vaginal flora, milk yield and fertility of cyclic and non-cyclic dairy cows

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