Ovarian follicular development in mink (Mustela vison)

Douglas, D. A.; Pierson, R. A.; Murphy, Bruce D.

doi:10.1530/jrf.0.1000583

Cited by 17 publications

(6 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Notably, an increase in P4 also was detected just prior to breeding in most profiles. This suggests that follicular luteinization may occur prior to the initiation of the LH surge in red pandas, as described in canids and mink (Concannon, Hansel, & McEntee, ; Douglas, Pierson, & Murphy, ). Concannon et al () reported that dogs exhibit increased progesterone secretion 60–70 hr prior to ovulation, which is similar to the pattern observed in this study.…”

Section: Discussionmentioning

confidence: 79%

Integrating trans‐abdominal ultrasonography with fecal steroid metabolite monitoring to accurately diagnose pregnancy and predict the timing of parturition in the red panda (Ailurus fulgens styani)

et al. 2017

View full text Add to dashboard Cite

Red pandas (Ailurus fulgens styani) exhibit a variable gestation length and may experience a pseudopregnancy indistinguishable from true pregnancy; therefore, it is not possible to deduce an individual's true pregnancy status and parturition date based on breeding dates or fecal progesterone excretion patterns alone. The goal of this study was to evaluate the use of transabdominal ultrasonography for pregnancy diagnosis in red pandas. Two to three females were monitored over 4 consecutive years, generating a total of seven profiles (four pregnancies, two pseudopregnancies, and one lost pregnancy). Fecal samples were collected and assayed for progesterone (P4) and estrogen conjugate (EC) to characterize patterns associated with breeding activity and parturition events. Animals were trained for voluntary transabdominal ultrasound and examinations were performed weekly. Breeding behaviors and fecal EC data suggest that the estrus cycle of this species is 11-12 days in length. Fecal steroid metabolite analyses also revealed that neither P4 nor EC concentrations were suitable indicators of pregnancy in this species; however, a secondary increase in P4 occurred 69-71 days prior to parturition in all pregnant females, presumably coinciding with embryo implantation. Using ultrasonography, embryos were detected as early as 62 days post-breeding/50 days pre-partum and serial measurements of uterine lumen diameter were documented throughout four pregnancies. Advances in reproductive diagnostics, such as the implementation of ultrasonography, may facilitate improved husbandry of pregnant females and allow for the accurate prediction of parturition.

show abstract

Section: Discussionmentioning

confidence: 79%

Integrating trans‐abdominal ultrasonography with fecal steroid metabolite monitoring to accurately diagnose pregnancy and predict the timing of parturition in the red panda (Ailurus fulgens styani)

et al. 2017

View full text Add to dashboard Cite

show abstract

“…1989; Lagerkvist et al. 1992; Douglas et al. 1994), but its existence needs further studies in ferrets.…”

Section: Discussionmentioning

confidence: 99%

Reproductive Features and Faecal Progesterone Metabolite Profile in Female Ferrets

Prohaczik

Kulcsár

Glávits³

et al. 2011

Reprod Domestic Animals

View full text Add to dashboard Cite

Elevated post-partum progesterone metabolite (P(4) -met) levels have been recently postulated to occur in lactating lynxes. The aims of this study were to monitor reproductive features in female ferrets, changes in the faecal P(4) -met concentrations throughout the breeding season and ovarian activity in post-partum lactating and non-lactating (NL) female ferrets. Our results indicate that coinciding with the results described in the lynx, elevated faecal P4-met concentrations occur in lactating ferrets, furthermore, that the duration of elevated secretion of P(4) seems to be dependent on the duration of lactation (P4-met at delivery, n=47: <500 ng/g; 5-7 days after delivery, during lactation, n=47: ≥ 500-800 ng/g; in females weaned at delivery, n=4: baseline levels). Three days after ovariohysterectomy of lactating females, P(4) -met concentrations decreased to baseline levels. In lactating females, the ovarian stroma is more active than that in NL ones implicating that the ovary is at least in part responsible for the elevated P4-met concentrations. Ovaries of lactating females contained many luteinized cells either as luteinized granulose cells in the wall of late pre-antral/early antral follicles or as corpus luteum (CL)-like structures. Early resumption of the entire ovarian activity (developed follicles and oestrus) occurs in NL post-partum females, while final follicular development is blocked (follicles stalls at antral stage) in the lactating ones (however, occasionally lactational oestrus may occur). We suppose that the elevated faecal P4-met during lactation together with suckling and other hormonal effects may contribute to prevention of early returning to oestrus in nursing female ferrets.

show abstract

“…(1995) proposed that the multiple distinct oestruses observed in wild U. arctos are the result of discrete, successive waves of follicular development, and that the interval between coitus represents the time needed for the subsequent wave of follicles to mature following ovulation of the previous wave. Therefore, the 7‐day threshold was chosen because this is the minimal inter‐oestrus interval duration documented in mink Mustela vison (Douglas et al ., 1994), the carnivore most closely related to bears for which these mechanisms of ovarian physiology are well established.…”

Section: Evidence Of Circannual Gonadal Rhythmsmentioning

confidence: 99%

Evolution of reproductive seasonality in bears

2007

View full text Add to dashboard Cite

1. Of the eight species of Ursidae, six are currently at risk of extinction and the remainder face significant risks to their future survival. One of the greatest threats to bears is humanimposed environmental alteration (e.g. global warming, chemical pollutants, deforestation). An examination of the reproductive biology and phylogeny of the Ursidae reveals reproductive seasonality as a probable adaptation to adverse environmental conditions. 2. Seven of the eight extant species exhibit distinct mating and birth seasons, with the most ancient species evolving facultative seasonality as an adaptation to the increasingly seasonal climate of the Pliocene. The remainder of the extant species evolved during the Pleistocene glaciations, under conditions of severe seasonal food restriction. Under these conditions, an obligate mode of seasonality emerged and persists to the present. 3. Knowledge of the natural history of seasonal reproduction in the ursids and how it evolved in response to global climatic change provides a context for understanding the ramifications of current environmental change on the reproduction of these important species.

show abstract

Ovarian follicular development in mink (Mustela vison)

Abstract: Ovarian follicular dynamics were studied during the breeding season, before and after ovulation in mink. Nulliparous female mink were stimulated to ovulate with an injection of 4 \g=m\g GnRH. Ovaries from three animals were collected on days 0, 2, 3, 4, 5, 6

Cited by 17 publications

References 3 publications

Integrating trans‐abdominal ultrasonography with fecal steroid metabolite monitoring to accurately diagnose pregnancy and predict the timing of parturition in the red panda (Ailurus fulgens styani)

Integrating trans‐abdominal ultrasonography with fecal steroid metabolite monitoring to accurately diagnose pregnancy and predict the timing of parturition in the red panda (Ailurus fulgens styani)

Reproductive Features and Faecal Progesterone Metabolite Profile in Female Ferrets

Evolution of reproductive seasonality in bears

Contact Info

Product

Resources

About