Corpus Luteum Sensitivity to PGF2α Administration in the Martina Franca Jenny

Carluccio, Augusto; Tosi, Umberto; Contri, Alberto; Amicis, Ippolito De; Veronesi, M.C.

doi:10.1007/s11259-006-0033-9

Cited by 17 publications

(15 citation statements)

References 5 publications

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“…The recorded results regarding the growth rate of preovulatory follicle to reach a maximum diameter was compatible with other reports [6, 18]. The day of follicular deviation of the dominant follicle (DF), its growth rate, maximum diameter, day of maximum diameter deviation day were similar to findings of previous studies for native Egyptian Jennies [26], but greater values were reported for mammoth (41.3 ± 1.3 mm [6] Catalonian [15], standard [18] and Martina Franca [20] Jennies). Estradiol is a candidate for involvement in the mechanism that causes follicle deviation in mares [27].…”

Section: Discussionsupporting

confidence: 90%

Ovarian Follicular Dynamics during the Estrous Cycle in Jennies in Upper Egypt

Derar

Hussein

2011

Veterinary Medicine International

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The objective of the current study was to describe follicular dynamics in Egyptian Jennies throughout the estrous cycle. In this experiment, 8 estrus cycles in 8 cyclic Jennies were studied from February to June using ultrasonography. The result revealed that one follicular wave per cycle was recorded throughout the studied period. Dominant follicle (DF) was firstly detected at −0.80 ± 0.84 day in Jennies. The growth rate of DF was 2.32 ± 0.18 mm/day. Left ovulations were nonsignificantly (P = .07) more than right ovulations (55.6% versus 44.6%). The CL was firstly detected at D 2.58 ± 1.2, developed in a rate of 1.19 ± 0.07 mm/day, reached a maximum diameter of 30.77 ± 1.28 mm at D 13.0 ± 0.70, and started to regress on D 17.05 ± 0.64 with a mean regression rate of 1.75 ± 0.17 mm d−1. Results of the present study indicated that Jennies had one follicular wave per cycle. The Day of the cycle has a significant effect on the number of different classes of the ovarian follicles, but not large ones. Ultrasonographic characteristics of the preovulatory follicles could be useful to predict ovulation. CL developed and regressed in a slow rate.

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Section: Discussionsupporting

confidence: 90%

Ovarian Follicular Dynamics during the Estrous Cycle in Jennies in Upper Egypt

Derar

Hussein

2011

Veterinary Medicine International

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“…The second estrus was observed 32.2±1.58 days after parturition with an interestrus interval period of 25.0±1.73 days between the first and second cycles. The follicle size at the time of the first recognized sign of the second estrus was 24.00±2.07 mm (20-26 mm), which was comparable to First observed estrus time 7.50±2.06 [6][7][8][9][10] that of the first estrus (Table 1). The behavioral estrus lasted 6.0±1.00 days and 5.6±1.67 days in the first and the second cycles, respectively.…”

Section: Resultssupporting

confidence: 67%

“…Like in other species, a linear relation between ovarian structures and plasma progesterone concentrations is present in jennies 8,14 . Carluccio et al 10 noted that the plasma P4 concentration dropped to 1 ng/ml during the estrus. In the present study, the ultrasonographic findings of the ovarian structures were supported with the plasma P4, E2 and 20a-OH-P4 values.…”

Section: Discussionmentioning

confidence: 99%

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Uterine Involution, Follicle Development and Concentrations of Plasma Progesterone, 20α-OH-Progesterone and Total Estrogen Levels During the Postpartum Period in Anatolian Donkeys

Kalender¹,

Aslan²,

Schwarzenberger³

et al. 2012

Kafkas Univ Vet Fak Derg

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In this study, it is aimed to determine the length of estrus cycle, size of the preovulatory follicle, and ovulation time during the postpartum period (pp) in Anatolian jennies and to measure steroid hormone levels during the same period. Five healthy Jennies at late-stage of gestation were included in the study. During the post partum period, plasma progesterone (P4), total estrogen (E2) and 20α-OH-progesterone (20α-OH-P4) levels were studied by RIA. Ovarian activity and uterus involution were determined by rectal palpation and ultrasound examinations. The first postpartum behavioral estrus occurred as early as 6 days pp. Follicles were reached to a preovulatoric size of 30 to 35 mm during the 2 nd day of estrus, during which plasma P4, E2 and 20α-OH-P4 concentrations were 0.9±0.40 ng/ml, 6.82±4.64 ng/ml and 0.98±0.21 ng/ml, respectively. The first ovulation occurred 10-15 days after parturition. During the first postpartum cycle, plasma P4 reached to a maximum concentration 14 days after ovulation. The second estrus was observed 32.2±1.58 days postpartum period (pp). The estrus behaviour lasted 6.0±1.00 days and 5.6±1.67 days in the first and second cycles, respectively. The uterus borders were detected by rectal palpation as early as 3 and 4 days postpartum period (pp). The uterus was totally palpable 6-9 days after parturition. Importantly, a high correlation was determined between the P4 and 20α-OH-P4 concentrations.

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“…A single high-dose bolus can be administered to induce luteolysis. Natural rather than synthetic PGF2a analogs are usually used in mares and jennies and at lower doses than those needed for ruminants (5 vs. 25 mg), given the greater sensitivity of their luteal cells to prostaglandins [11][12][13]. However, luteolysis has been little studied in the jenny [37], and understanding CL physiology and morphology after induced luteolysis is important if reproductive technologies are to be successfully used in this species.…”

Section: Introductionmentioning

confidence: 99%