Luteinizing hormone and progesterone concentrations in serum of heifers administered a short half-life prostaglandin (PGF2α) or long half-life prostaglandin analogue (fenprostalene) on days six or eleven of the estrous cycle

Stotts, J. A.; Stumpf, T. T.; Day, M. L.; Wolfe, M.; Wolfe, Pamela; Kittok, R. J.; Nielsen, Marie Vejrup; Deutscher, Gene H.; Kinder, J. E.

doi:10.1016/0093-691x(87)90257-3

Cited by 4 publications

(2 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During this period, mean concentrations of LH increase linearly [33,34], with an increase in frequency [34] and amplitude of LH pulses [35]. The preovulatory surge of gonadotropins occurs 50-70 h after treatment of cows with prostaglandin F 2 a (PGF 2 ,) [36,37] or after the initiation of sequential E 2 implantation in ovariectomized cows [32]. The distribution of intrapituitary gonadotropin isoforms has not been evaluated during the follicular phase of the bovine estrous cycle, when concentrations of E 2 and LH are dramatically increased.…”

Section: Introductionmentioning

confidence: 99%

Effects of 17β-Estradiol on Distribution of Pituitary Isoforms of Luteinizing Hormone and Follicle-Stimulating Hormone during the Follicular Phase of the Bovine Estrous Cycle1

Kojima

Cupp

Stumpf

et al. 1995

Biology of Reproduction

View full text Add to dashboard Cite

The objective of this study was to examine the influence of 17 beta-estradiol (E2) on distribution of LH and FSH isoforms during the follicular phase of the bovine estrous cycle prior to the preovulatory surges of LH and FSH. On Day 16 of the estrous cycle (Day 0 = estrus), intact controls (CONT; n = 4) were treated with prostaglandin F2 alpha (PGF2 alpha) to induce luteal regression and initiation of the follicular phase. Other cows were also treated with PGF2 alpha and either ovariectomized (OVX; n = 5) or ovariectomized and given E2 implants (OVXE; n = 6) to mimic the pattern of increasing E2 concentrations during the follicular phase of the estrous cycle. Pituitaries were collected 40 h after treatment with PGF 2 alpha or ovariectomy (0 h). Aliquots of pituitary extracts were chromatofocused on pH 10.5-4.0 gradients. The LH resolved into thirteen isoforms (designated A-L and S, beginning with the most basic form) while FSH resolved into nine isoforms (designated I-IX, beginning with the most basic form). The percentage of LH as isoform F (elution pH = 9.32 +/- 0.01) was greater (p < 0.05) in the OVX group (48.5%) than in the OVXE group (45.0%). LH isoforms I (elution pH = 6.98 +/- 0.01) and J (elution pH = 6.48 +/- 0.01) were more abundant (p < 0.05) in cows from the OVXE (2.3 and 5.8%, respectively) than the OVX group (1.4 and 3.7%, respectively). Distribution of LH isoforms in cows from the three groups did not differ (p > 0.10).(ABSTRACT TRUNCATED AT 250 WORDS)

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of 17β-Estradiol on Distribution of Pituitary Isoforms of Luteinizing Hormone and Follicle-Stimulating Hormone during the Follicular Phase of the Bovine Estrous Cycle1

Kojima

Cupp

Stumpf

et al. 1995

Biology of Reproduction

View full text Add to dashboard Cite

show abstract

“…The luteolytic effect of PGF2α in cattle was described by several workers in the early 1970s. In dairy cattle, several studies confirmed the capability of PGF2α and its synthetic analogues like alfaprostol (Randel, 1988), clorprostenol (Cooper and Rowson, 1975), fenprostalene (Stotts et al, 1987) and luprostiol (Plata et al, 1990) to initiate the regression of mature CL in the ovary, thus provoking and synchronizing estrus of animals. Though the estrus synchronization appeared in the world since 45 years (Baruselli et al, 2013) but there is still considerable limitation.…”

Section: Introductionmentioning

confidence: 90%

Monitoring the Sonographic Ovarian Dynamics and Pregnancy Rate in Cyclic Murrah Buffalo Cows Synchronized with Prostaglandin F2α

Harun‐Or‐Rashid

Phulia

Hasan

et al. 2020

J Anim Reprod Biotechnol

View full text Add to dashboard Cite

The objective of this research work was to know ovarian dynamics and pregnancy rate of cyclic Murrah buffalo cows with induced estrus by administration of prostaglandin F2α (PGF2α) and timed artificial insemination (TAI) with frozen thawed semen. A total of 31 female buffaloes were selected for the study. The buffalos having matured CL observed by ultrasonography were given one intra muscular injection of cloprostenol 500 μg and TAI was performed using frozen thawed semen of Indian Murrah buffalo bull. Results showed that 90.32% (significantly, at p < 0.05) cows explore the sign of heat after injection of PG and 67.85% (significantly, at p < 0.05) cows were become pregnant out of 28 inseminated (TAI) cows. In the 28 inseminated (TAI) cows, average number of smaller and larger size of follicles were non-significantly (p > 0.05) higher at day 3 post PG injection, but the medium size of follicles was nonsignificantly (p > 0.05) higher at PG injection. At day 3 post PG injection the diameter of follicles was significantly (p < 0.05) higher, but the diameter of CL was significantly (p < 0.01) lower compared at PG injection. At PG injection the diameter of largest follicle was non-significantly differences (p > 0.05) in between pregnant and non-pregnant cows. But at day 3 post PG injection it was significantly (p < 0.01) higher in pregnant cows compared to non-pregnant cows. The number of small, medium, and large follicles at PG injection and at day 3 post PG injection were non-significantly (p > 0.05) difference in between pregnant and non-pregnant buffalo cows. Finally, it is concluded that the CL was effectively regresses and induced the sign of heat in buffalo cows and after AI the cows were become pregnant with significant rate. The study will help to the veterinarian and researcher to know the efficacy of PG injection and AI for reproductive efficiency in buffalo cows.

show abstract

Estrus induction with prostaglandin F2α, cloprostenol or fenprostalene during the normal estrous cycle, superovulation and after embryo collection

1990

View full text Add to dashboard Cite

Luteinizing hormone and progesterone concentrations in serum of heifers administered a short half-life prostaglandin (PGF2α) or long half-life prostaglandin analogue (fenprostalene) on days six or eleven of the estrous cycle

Cited by 4 publications

References 8 publications

Effects of 17β-Estradiol on Distribution of Pituitary Isoforms of Luteinizing Hormone and Follicle-Stimulating Hormone during the Follicular Phase of the Bovine Estrous Cycle1

Effects of 17β-Estradiol on Distribution of Pituitary Isoforms of Luteinizing Hormone and Follicle-Stimulating Hormone during the Follicular Phase of the Bovine Estrous Cycle1

Monitoring the Sonographic Ovarian Dynamics and Pregnancy Rate in Cyclic Murrah Buffalo Cows Synchronized with Prostaglandin F2α

Estrus induction with prostaglandin F2α, cloprostenol or fenprostalene during the normal estrous cycle, superovulation and after embryo collection

Contact Info

Product

Resources

About