Relationships between ovarian blood flow and ovarian response to eCG-treatment of dairy cows

Honnens, Ä.; Niemann, Heiner; Herzog, Kathrin; Paul, Vijay; Meyer, H. H. D.; Bollwein, Heinrich

doi:10.1016/j.anireprosci.2008.05.077

Cited by 22 publications

(17 citation statements)

References 51 publications

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“…However, no difference was observed between the experimental groups, suggesting that the variation of indices apparently is not determined by the percentage of regressed CLs. In superovulated cows, a progressive decline in ovarian artery PI was observed during the luteal phase (Honnens et al, 2009), in opposition to what was observed in the present study. The difference may be explained by the fact that superovulation in cows is not related to the occurrence of CL regression as in the sheep.…”

Section: Discussioncontrasting

confidence: 99%

Early luteal development in Santa Inês ewes superovulated with reduced doses of porcine follicle‐stimulating hormone

Rodriguez

Maciel

Uscátegui

et al. 2018

Reprod Domestic Animals

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Contents The aim was to compare the early luteal development in ewes superovulated with different doses of pFSH. Twenty‐nine Santa Inês ewes received a progesterone device (CIDR®) for 8 days. Gonadotrophic treatment started on Day 6: G200 (control, n = 9, 200 mg); G133 (n = 10, 133 mg); and G100 (n = 10, 100 mg of pFSH). On Day 6, all females received eCG (300 IU). B‐mode and spectral Doppler ultrasonography were performed daily during the early luteal phase (Days 11–15) to monitor the development of corpora lutea (CLs; dimensions) and ovarian arteries indices. CLs were also classified as normal or prematurely regressed (PRCL) on Day 15 by videolaparoscopy. Ewes from G100 and G133 showed gradual increase in luteal diameter during the early luteal phase (p < 0.001), whereas G200 animals presented increase from Day 11 to Day 13, and then decrease on Days 14 and 15 (p < 0.001). The G200 females showed greater percentage of PRCL (45.20%) than those of the other groups (p < 0.001). The normal CLs number was greater in G100 than in G133 (p = 0.04), while the PRCL number was greater in G200 than in the other groups (p = 0.03). Resistive index (RI) was greater in G200 than in G100 (p = 0.02). RI was lower in Day 12 than Day 15 (p = 0.02). Pulsatility index (PI) was greater on Days 14 and 15 (p < 0.01). In conclusion, the lowest dose of pFSH (100 mg) can be considered sufficient for an efficient superovulatory response in sheep, producing better CLs development dynamic in early luteal phase and ovarian blood perfusion and smaller number of PRCL than the traditional (200 mg) pFSH dose.

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Section: Discussioncontrasting

confidence: 99%

Early luteal development in Santa Inês ewes superovulated with reduced doses of porcine follicle‐stimulating hormone

Rodriguez

Maciel

Uscátegui

et al. 2018

Reprod Domestic Animals

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“…An increase in uterine and ovarian blood supply is observed during superovulatory treatments of dairy cows and mares (Honnens et al, 2008(Honnens et al, , 2009Bartlewski et al, 2016), and ovarian blood flow volume in mares is related to the effectiveness of superovulation; a positive correlation exists between the uterine artery pulsatility index and the number of recovered embryos (Witt et al, 2012;Bartlewski et al, 2016). Color Doppler sonography provides a valuable tool for detecting and monitoring dynamic changes in the vascular network and blood flow in various reproductive organs and tissues, including ovarian antral follicles (Fleischer and Andreotti, 2005).…”

Section: Introductionmentioning

confidence: 99%

Relationship of antral follicular blood flow velocity to superovulatory responses in ewes

Oliveira

Bartlewski

Jankowski

et al. 2017

Animal Reproduction Science

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The aim of this study was to examine the association between antral follicular blood flow velocity and the response of ewes to hormonal ovarian superstimulation. Ten Santa Inês ewes were subjected to a short- (7days; Group 1) or long-term (13days; Group 2) progesterone (CIDR; InterAg, Hamilton, New Zealand) priming, and a superovulatory treatment with porcine follicle-stimulating hormone (pFSH; Folltropin-V; Bioniche Animal Health, Belleville, ON, Canada), given twice daily for four consecutive days in decreasing doses and initiated four or ten days after CIDR insertion, respectively. Embryos were recovered surgically seven days after the last pFSH dose. From one day prior to until the end of the pFSH regimen (Days -1 to 3), all ewes underwent daily transrectal ultrasonography of ovaries. The number of high-velocity pixels (HVPs; 0.055-0.11m/s or upper 50% of recordable velocities) on Day 1 correlated directly with the number of corpora lutea (CL; r=0.92, P=0.0002) and of viable embryos (r=0.77, P=0.01). Correlations were also recorded between the number of HVPs on Day 3 and the recovery rate (r=-0.69, P=0.03), viability rate (r=-0.64, P=0.05), and percentage of degenerated embryos (r=0.65, P=0.04). The percentage of HVPs relative to the total area of ovarian cross section on Day 1 was correlated with the number of CL (r=0.95, P<0.001) and of viable embryos (r=0.85, P=0.002). This parameter on Day 3 was also correlated with the recovery rate (r=-0.69, P=0.03). The percentage of HVPs relative to the total Doppler area on Day 0 was correlated with the recovery rate (r=0.72, P=0.02). It can be concluded that sonographic assessment of high-velocity antral follicular blood flow has the makings of a useful non-invasive method to predict the outcome of the superovulatory treatment in ewes.

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“…Sheldon and Dobson (41) reported that 250 and 750 IU eCG administered on day 14 pp increased plasma estradiol concentration. Similarly, Honnens et al (16) reported that eCG added to estrus synchronization programs on day 10 in Holstein cows increased plasma estrogen hormone levels on day 13.…”

Section: Resultsmentioning

confidence: 88%

Effect of eCG applied to dairy cows in the postpartum period on ovarian activity and reproductive performance

Yenilmez¹,

Özdemir²

2020

Medycyna Weterynaryjna

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The aim of this study was to determine the effect of equine chorionic gonadotropin (eCG) applied in postpartum (pp) period on ovarian follicle development, serum estradiol concentration, serum progesterone concentration, the calving-to-first oestrus (calving-to-first insemination) interval, and conception at first insemination. The material of this study consisted of 20 cows on day 14 pp. Cows included in this study were randomly divided into two groups. Cows in the first group, were treated with eCG (500 IU Folligon; Intervet, Holland) for 14 days. No treatment was applied to the second group, and it was left as a control group, Ovarian follicle diameters were measured by ultrasonographic examination on days 14, 16, 18, 20 and 22 pp in all animals included in the study. Serum estradiol and progesterone were from blood samples taken on the same days. All animals included in the study were followed up until the first observable oestrus was detected, and they were inseminated 12 hours after the appearance of oestrus symptoms. A pregnancy examination was performed on the 45th day after insemination. In cows administered with eCG during postpartum period, an increase in ovarian follicle diameters compared to untreated cows and a decrease in the calving-to-first oestrus interval were determined. In contrast, serum estradiol and progesterone hormone levels did not differ between the two groups. Pregnancy rate in the experimental group was higher than that in the control group, but there was no statistical difference between them. As a result, it was concluded that eCG applied to dairy cows on day 14 pp did not affect serum estradiol and progesterone levels, but it affected the ovarian follicle diameter and the calving-to-first oestrus interval positively.

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Relationships between ovarian blood flow and ovarian response to eCG-treatment of dairy cows

Cited by 22 publications

References 51 publications

Early luteal development in Santa Inês ewes superovulated with reduced doses of porcine follicle‐stimulating hormone

Early luteal development in Santa Inês ewes superovulated with reduced doses of porcine follicle‐stimulating hormone

Relationship of antral follicular blood flow velocity to superovulatory responses in ewes

Effect of eCG applied to dairy cows in the postpartum period on ovarian activity and reproductive performance

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