Accessory corpora lutea, lutein cell origin, and the ovarian cycle in the Canadian porcupine

Mossman, Harland W.; Judas, Ilse

doi:10.1002/aja.1000850103

Cited by 41 publications

(18 citation statements)

References 18 publications

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“…Among these few known examples are the white-tailed deer (Mansell 1971) and some porcupines (Mossman & Judas 1949, Jori et al 2002. The closest living relatives to elephants, the Sirenia, have LUF that form accessory luteal structures during the reproductive cycle and pregnancy (Marsh et al 1984, Rodrigues et al 2008.…”

Section: Discussionmentioning

confidence: 99%

Luteogenesis during the estrous cycle in Asian elephants (Elephas maximus)

Niemuller¹,

Gray²,

Rich³

et al. 2010

Reproduction

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The occurrence of multiple corpora lutea (CLs) in the ovaries of the cycling and pregnant elephant, a monovulatory mammal, has driven scientific discussions during the past five decades. However, fundamental knowledge on luteogenesis is lacking. In this long-term study, CL formation and regression throughout the estrous cycle were monitored using transrectal 2D-and 3D ultrasonography in 33 captive Asian elephants. Serum or urinary progestagens (P m ) were measured to determine the reproductive cycle stage. In seven females, serum P m and LH concentrations were directly related to ovarian events. We have found two different modalities of luteal development: one for the accessory CL (acCL) and one for the ovulatory CL (ovCL). acCLs were derived from luteinization of larger, subordinate follicles after the first anovulatory LH peak. The dominant follicle produced the largest CL after the second (ovulatory) LH peak. The first luteal tissue formation became visible w10 days after the respective LH peak. After ovulation, it took 29.8G5.0 days for the acCLs to reach their maximum diameter, whereas the ovCL reached a significantly larger size (33.2G2.3 mm, P!0.0001) about 10-15 days later. All CLs were visible throughout the new follicular phase, with some of the larger ones still present in the subsequent luteal period. In this study, we have demonstrated that Asian elephants have evolved a novel method for luteal development and function, and by repeatedly forming two types of distinctly different CLs for every reproductive cycle, they have ensured that there will be sufficient luteal capacity for maintaining a 22-month pregnancy should conception occur.

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Section: Discussionmentioning

confidence: 99%

Luteogenesis during the estrous cycle in Asian elephants (Elephas maximus)

Niemuller¹,

Gray²,

Rich³

et al. 2010

Reproduction

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“…A characteristic feature of the hystricomorph ovary is the formation of accessory corpora lutea (cl) from luteinization of unovulated follicles. This has been described in the Canadian porcupine (Mossman & Judas, 1949), the mountain viscacha (Pearson, 1949), the coypu (Rowlands & Heap, 1966), the chinchilla (Weir, 1966), the acouchi (Rowlands, Tam & Kleiman, 1970;Weir, 1971a) and the agouti (Weir, 1971b). The pattern and degree of develop¬ ment of the accessory cl vary in the different species and may grow so large (e.g.…”

Section: Introductionmentioning

confidence: 93%

The Reproductive Organs of the Female Plains Viscacha, Lagostomus Maximus

Weir¹

1971

Reproduction

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“…The morphology of the CL has already been described in detail for many species [26][27][28][29][30][31]. Histologic and laparoscopic methods are used to determine the estrous cycle phase [32][33][34].…”

Section: Introductionmentioning

confidence: 99%