The oestrous cycle of the Damaraland mole‐rat revisited: evidence for induced ovulation

Duration of the oestrous cycle and changes in plasma hormone concentrations measured after an induced ovulation in scimitar-horned oryx (Oryx dammah)

Journal of Zoology ◽

10.1111/j.1469-7998.1996.tb05384.x ◽

1996 ◽

Vol 238 (1) ◽

pp. 137-148 ◽

Cited By ~ 6

Author(s):

J. M. Bowen ◽

G. K. Barrell

Keyword(s):

Oestrous Cycle ◽

Induced Ovulation ◽

Plasma Hormone

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Studies on the Oestrous Cycle of Camel (Camelus dromedarius)

Journal of Agricultural and Marine Sciences [JAMS] ◽

10.24200/jams.vol4iss1pp43-46 ◽

1999 ◽

Vol 4 (1) ◽

pp. 43

Author(s):

M.M. Alfuraiji

Keyword(s):

Corpus Luteum ◽

Oestrous Cycle ◽

Camelus Dromedarius ◽

Natural Cycle ◽

Blood Samples ◽

Induced Ovulation ◽

Follicular Wave ◽

Wave Cycle ◽

Arabian Camel

The aim of this study was to investigate the oestrous cycle of the Arabian camel. Eight female camels (Majaheem) were used. Daily blood samples were collected for 60 days to measure Oestradiol - 178 (E2) and progesterone (P4) levels using radioimmunoassays. The duration of the follicular wave cycle ranged from 25-30 days and the length of oestrous from 5-7 days. P, levels were low (<3.2 nmol/l) throughout the cycle, while E2 levels were high during oestrous. The corpus luteum was therefore not present during the natural cycle suggesting that Arabian camels experienced induced ovulation.

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SUPEROVULATION TREATMENT OF ADULT MICE: THEIR SUBSEQUENT NATURAL FERTILITY AND RESPONSE TO FURTHER TREATMENT

Journal of Endocrinology ◽

10.1677/joe.0.0210147 ◽

1960 ◽

Vol 21 (2) ◽

pp. 147-154 ◽

Cited By ~ 21

Author(s):

R. G. EDWARDS ◽

RUTH E. FOWLER

Keyword(s):

Embryonic Development ◽

Reproductive Behaviour ◽

Chorionic Gonadotrophin ◽

Human Chorionic Gonadotrophin ◽

Oestrous Cycle ◽

Natural Fertility ◽

Corpora Lutea ◽

Positive Correlation ◽

Induced Ovulation ◽

Adult Mice

SUMMARY The effects of an injection of pregnant mares' serum (PMS), human chorionic gonadotrophin (HCG), or of superovulation treatment with both of these gonadotrophins on subsequent reproductive behaviour of adult mice and on their response to a second superovulation treatment given shortly afterwards have been studied. An injection of PMS had induced ovulation, but not superovulation, in dioestrous mice autopsied 24 hr later. The injection also induced oestrus and superovulation in many mice (c. 30%) 60–62 hr later, a positive correlation being found between mating and ovulation in these mice. The resumption of the natural oestrous cycle after an injection of PMS was delayed in some of the mice. HCG had induced ovulation in mice in metoestrus-II and dioestrus autopsied 24 hr later. Most mice quickly resumed their natural oestrous cycle after the injection of HCG. If mice were not paired with males after the full superovulation treatment with PMS and HCG, they resumed their natural oestrous cycle within 3–6 days. Ovulation, fertilization and pregnancy during or after this natural oestrus were quite normal. These mice were also capable of further induced oestrus and superovulation when given a second course 1–3 days after the first treatment, though the number of mice that ovulated was lower, and the variability between mice in the number of eggs ovulated was higher, if the second treatment was given 1–2 days after the first. The corpora lutea formed in mice that mated after a superovulation treatment were fully active. A second treatment induced superovulation in most mice, but failed to induce oestrus in the majority of them, especially when given during mid-pseudopregnancy. Fertilization and embryonic development were quite normal in the few mice that mated.

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