LH secretion around induced ovulation during early and late diestrus and its effect on the appearance of short estrous cycles in cyclic dairy heifers

Rantala, Mari H.; Taponen, Juhani

doi:10.1016/j.theriogenology.2014.10.012

Cited by 3 publications

(3 citation statements)

References 33 publications

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“…The blood plasma levels of estradiol measured during the estrous cycle are represented in The peak values of estradiol in the present study were higher than that of previously reported in Brahman, Angus and Senepol cows (Alvarez et al, 2000). Rantala and Taponen (2015) reported that estradiol reached to peak value (8.2±1.8pg/ml) on Day 20 in Dairy cows. Glencross and Pope (1981) cited that plasma estradiol-17β concentration was low at the start of luteal regression (2.2 ±0.5 pg/ml), increased to 3.8 ±0.6 pg/ml on next day and reached 6.6 ±0.9 pg/ml when the concentration of progesterone in the blood had fallen to a minimum in the Holstein heifers.…”

Section: Mean Estradiol Levels In 2-wave and 3-wave Estrous Cyclecontrasting

confidence: 76%

Studies on Ovarian Follicular Dynamics and Steroid Profiles in Sahiwal Cattle

Dodiyar

Brar

Singh

et al. 2021

IJAR

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Background: Understanding of ovarian follicular dynamics and endocrine regulation is essential to design and use interventions to optimize reproductive efficiency. Bos indicus and Bos taurus cows have some differences in their follicular dynamics and ovarian steroidal hormones. The present study was planned to understand follicular dynamics vis-a-vis ovarian steroids profiles in Sahiwal cattle. Methods: The study was conducted in normal cyclic, pluriparous, non-lactating Sahiwal cows (n=7). Trans-rectal ultrasonography was performed to record the location, size, number of follicles and size of corpus luteum (CL) from the beginning, till the end of experiment. The dataset was used to characterize the follicular wave emergence, growth, regression, time of selection and ovulation of the dominant follicle in each cow. Result: Three Sahiwal cows showed two wave and four cows showed three wave estrous cycles with mean interovulatory length of 20.33±0.33 and 22.50±0.28 days, respectively. No significant difference was recorded in the maximum diameter of corpus luteum, P4 and E2 plasma levels between 2-wave and 3-wave estrous cycles. The peak progesterone values of 6.00±0.91 and 6.2±1.2 ng/ml and peak estradiol values of 15.83±0.60 and 14.31±0.44 ng/ml were recorded in 2-wave and 3-wave estrous cycle, respectively. The results showed that Sahiwal cows had 2-wave and 3-wave estrous cycle and the 3-wave estrous cycle had comparatively longer inter-ovulatory period and smaller maximum diameter of second wave dominant follicle than 2-wave estrous cycle.

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Section: Mean Estradiol Levels In 2-wave and 3-wave Estrous Cyclecontrasting

confidence: 76%

Studies on Ovarian Follicular Dynamics and Steroid Profiles in Sahiwal Cattle

Dodiyar

Brar

Singh

et al. 2021

IJAR

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“…; Ginther et al . ; Rantala & Taponen ), being similar to the heifers in the 5‐day treatment, but greater than the size observed in the 4‐day treatment. Other studies have reported larger follicular diameter in dairy heifers at CIDR insert removal (11.7 mm; Mellieon et al .…”

Section: Discussionmentioning

confidence: 54%

“…It is well documented that in cattle the timing of ovulation is influenced by the size of the preovulatory follicle (Sirois & Fortune 1988). Previous studies in dairy heifers submitted to ovulation synchronization protocols have shown a diameter of the ovulatory follicle between 13 and 14 mm (Sirois & Fortune 1988;Taponen et al 1999;Nord eus et al 2012;Ginther et al 2013;Rantala & Taponen 2015), being similar to the heifers in the 5-day treatment, but greater than the size observed in the 4-day treatment. Other studies have reported larger follicular diameter in dairy heifers at CIDR insert removal (11.7 mm; Mellieon et al 2012) and at ovulation (16.6 AE 0.9 mm Taponen et al 1999) compared to the values reported here.…”

Section: Discussionmentioning

confidence: 88%

Comparison of follicular development, timing of ovulation and serum progesterone, estradiol and luteinizing hormone concentrations in dairy heifers treated with 4‐ or 5‐day CoSynch + CIDR protocols

Fishman‐Holland

Stoskute

Ferrer

et al. 2019

Veterinary Medicine & Sci

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The use of 4‐day CoSynch + Controlled internal drug release (CIDR) + timed artificial insemination (TAI) in dairy heifers has resulted in adequate pregnancy rates compared with the 5‐day CoSynch + CIDR + TAI protocol. The objective of this study was to compare follicular growth, timing of ovulation and serum progesterone (P4), estradiol (E2) and luteinizing hormone (LH) concentrations in dairy heifers treated with modified 4‐ or 5‐day CoSynch + CIDR protocols (CIDR for 4 or 5 days, PGF2α at CIDR removal and GnRH + TAI 72 h later). Twelve cycling Holstein heifers were randomly assigned to either the 4‐ or 5‐day Co‐Synch+CIDR (n = 6/treatment) to receive an intravaginal insert CIDR® containing 1.38 g of P4 for 4 or 5 days, respectively. At CIDR removal, 25 mg of PGF2α was injected IM; 72 h after CIDR removal, heifers received 100 μg of GnRH IM and timed artificial insemination (TAI). Follicular growth and timing of ovulation were assessed using transrectal ultrasonography. Blood samples were collected at the time of CIDR insertion and at frequent time points after CIDR removal for determination of P4 (at TAI), E2 (every 12 h) and LH (every 6 h during the first and second day and every 2 h on the third day). Heifers in the 4‐day group had smaller follicles from CIDR insert removal to ovulation compared with heifers in the 5‐day treatment. Five of six heifers (83.3%) in the 4‐day treatment ovulated at 90–96 h post CIDR insert removal, whereas most heifers in the 5‐day treatment (4/6; 66.6%) ovulated at 84–90 h post CIDR insert withdrawal. Heifers in the 5‐day treatment reached greater peak LH concentration between 48 and 72 h after CIDR insert removal and lesser E2 concentration at TAI than heifers in the 4‐day treatment. In conclusion, heifers in the 4‐day treatment had smaller follicular diameter at 0, 30, 36, 42 and 48 h after CIDR insert removal, longer interval from CIDR insert removal to ovulation, greater E2 concentrations at TAI, and lesser peak LH concentration than heifers in the 5‐day treatment. These results represent a baseline for further studies to determine if prolonging the interval to TAI by 6 h in the 4‐day CoSynch+CIDR would improve pregnancy risk.

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Circulating progesterone concentrations and preovulatory follicle diameters affecting ovulatory response in crossbred dairy heifers, following a 7-day progesterone-based synchronization protocol

Kornmatitsuk

2021

Trop Anim Health Prod

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LH secretion around induced ovulation during early and late diestrus and its effect on the appearance of short estrous cycles in cyclic dairy heifers

Cited by 3 publications

References 33 publications

Studies on Ovarian Follicular Dynamics and Steroid Profiles in Sahiwal Cattle

Studies on Ovarian Follicular Dynamics and Steroid Profiles in Sahiwal Cattle

Comparison of follicular development, timing of ovulation and serum progesterone, estradiol and luteinizing hormone concentrations in dairy heifers treated with 4‐ or 5‐day CoSynch + CIDR protocols

Circulating progesterone concentrations and preovulatory follicle diameters affecting ovulatory response in crossbred dairy heifers, following a 7-day progesterone-based synchronization protocol

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