Journal ArticleDOI
Stimulation of seasonally anovular merino ewes by rams. I. Time from introduction of the rams to the preovulatory LH surge and ovulation
TLDR
Two experiments were performed on seasonally anovular Merino ewes to determine the intervals between time of introduction of rams, the preovulatory surge of LH and the first ovulation, and probit analysis shows that 50% of teased eWes ovulated within 41 h of being exposed to rams.About:
This article is published in Animal Reproduction Science.The article was published on 1979-05-01. It has received 116 citations till now.read more
Citations
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Journal ArticleDOI
Pineal Melatonin Secretion Drives the Reproductive Response to Daylength in the Ewe
TL;DR: It is concluded that the pineal mediates the reproductive response of the ewe to inductive photoperiods through its daily rhythm of melatonin secretion.
Journal ArticleDOI
The physiological responses of anovulatory ewes to the introduction of rams: a review.
TL;DR: Ewes of many breeds can be stimulated to ovulate by the reintroduction of rams and appear to be effected both through a delay in the onset of the LH surge and through a direct action of progesterone on the ovary.
Journal ArticleDOI
Factors affecting the secretion of luteinizing hormone in the ewe.
TL;DR: LH is secreted as discrete pulses throughout all stages of the reproductive cycle of the ewe, including pre‐pubertal, seasonal and lactational anoestrus, and the luteal and follicular phases of the oestrous cycle.
Journal ArticleDOI
Circannual cycles of luteinizing hormone and prolactin secretion in ewes during prolonged exposure to a fixed photoperiod: Evidence for an endogenous reproductive rhythm
TL;DR: The existence of an endogenous circannual rhythm of reproductive neuroendocrine function in ewes is documented and period of these cycles differed from 365 days.
Journal ArticleDOI
Increased plasma lh levels in seasonally anovular merino ewes following the introduction of rams
TL;DR: There is apparently a relationship between the pattern of LH secretion after introducing the rams, and the ovulatory response that can be expected, according to radioimmunoassay of plasma samples.
References
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Journal ArticleDOI
The preparation of 131i-labelled human growth hormone of high specific radioactivity
TL;DR: The loss of immunological reactivity at high specific radioactivities or at high levels of chemical substitution with STAI/sup 127/!iodine is demonstrated.
Journal ArticleDOI
Solid-phase radioimmunoassay in antibody-coated tubes.
K. J. Catt,Geoffrey W. Tregear +1 more
TL;DR: The adsorption of antibody to polymeric surfaces has been used to develop a new method of solid-phase radioimmunoassay that is simple, rapid, inexpensive, and suitable for automation.
Journal ArticleDOI
Probit Analysis: A Statistical Treatment of the Sigmoid Response Curve.
Journal ArticleDOI
Radioimmunoassay for Ovine Luteinizing Hormone. Secretion of Luteinizing Hormone During Estrus and Following Estrogen Administration in the Sheep
TL;DR: The sheep does not appear to produce a placental gonadotrophin comparable to human chorionic gonadOTrophin in regard to immunological crossreaction with pituitary LH, and plasma levels of LH rose sharply 4–16 hr after the onset of estrus.
Journal ArticleDOI
Pulsatile Release of LH and Secretion of Ovarian Steroidsin Sheep During the Luteal Phase of the Estrous Cycle
TL;DR: Findings indicate that the follicle, and possibly the stroma, respond rapidly to episodic fluctuations in the concentration of LH and are probably involved in the negative feedback loop between the ovary and the hypothalamic pituitary system.
Related Papers (5)
Increased plasma lh levels in seasonally anovular merino ewes following the introduction of rams
Stimulation of seasonally anovular merino ewes by rams. II. Premature regression of ram-induced corpora lutea
C.M. Oldham,Graeme Martin +1 more