Sensory and behavioural control of gonadotrophin secretion during suckling-mediated anovulation in cows
نویسندگان
چکیده
منابع مشابه
Correspondence of Gonadotropin-Releasing Hormone and Luteinizing Hormone Secretion during Suckling in Postpartum Cows
The hypothalamus in the lower part of the brain contains neurons that produce a small peptide, gonadotropinreleasing hormone (GnRH, LHRH), that regulates luteinizing hormone (LH) secretion by the anterior pituitary gland. Important functions of LH include induction of ovulation in preovulatory follicles during estrus and the luteinization of granulosa cells lining those collapsed follicles to f...
متن کاملEffect of suckling and ovariectomy on the control of luteinizing hormone secretion during the postpartum period in beef cows.
Twenty-two mature pluriparous beef cows were randomly assigned to one of six treatments in a 2 X 3 factorial experiment in order to study the role of suckling and ovarian factors on control of the tonic and episodic release of luteinizing hormone (LH). Twelve cows remained intact (INT) and 10 were ovariectomized (OVX) within 4 days following the day of parturition (Day 0). The suckling intensit...
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چکیده ندارد.
15 صفحه اولEffect of ovariectomy on tonic gonadotrophin secretion in cyclic and post-partum dairy cows.
Blood collections were taken every 20 min over 12 h on 6 occasions within 1 month before and after gonadectomy of 5 cyclic and 5 post-partum dairy cows and again on one occasion 3--5 months thereafter. By 4 days after ovariectomy of the cyclic cows (i.e. 4 days after oestrus) average plasma LH values and the frequency and amplitude of pulsatile LH release had increased about 3-fold. In the cows...
متن کاملDisorders of gonadotrophin secretion.
In recent years, particularly since the advent ofradioimmunoassay, the regulation of pituitary gonadotrophin secretion has been extensively studied in man and in animals (Greep et al., 1976). I shall not comprehensively catalogue the different diseases and syndrome complexes associated with disordered gonadotrophin secretion. These are systematically covered in several textbooks and reviews (Lo...
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ژورنال
عنوان ژورنال: Bioscientifica Proceedings
سال: 2019
ISSN: 2515-0227
DOI: 10.1530/biosciprocs.3.035