Matches in SemOpenAlex for { <https://semopenalex.org/work/W2113268288> ?p ?o ?g. }
- W2113268288 endingPage "87" @default.
- W2113268288 startingPage "1" @default.
- W2113268288 abstract "(1) Luteinizing hormone (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. Secretion is probably also pulsatile during the preovulatory surge of LH. (2) The secretion of LH is affected by the ovarian steroids, oestradiol and progesterone, both of which act principally to reduce the frequency of the pulses. During the luteal phase the two steroids act synergistically to exert this effect, and during anoestrus oestradiol acts independently of progesterone. Androstenedione secreted by the ovary apparently has no role in the control of LH secretion. (3) The amplitude of the pulses may also be affected by the steroids but there are conflicting reports on these effects, some showing that amplitude is lowered by the presence of oestrogen and others showing increases in amplitude in the presence of oestrogen and progesterone. (4) The secretion of LH pulses is affected by photoperiod, social environment and nutrition. Under the influence of decreasing day-length, oestradiol alone cannot reduce the frequency of pulses and the ewe experiences oestrous cycles. When day-length is increasing, the hypothalamus becomes more responsive to oestradiol which reduces the frequency of the pulses. (5) A hypothetical pheromone secreted by rams can increase the frequency of the LH pulses in anoestrous ewes and thereby induce ovulation, possibly by inhibiting the negative feedback exerted by oestradiol. (6) The relationships between nutrition and reproduction are poorly understood, but it seems likely that the effects of nutrition are mediated partly through the hypothalamus and its control of the secretion of LH pulses. (7) The pulses of LH secreted by the anterior pituitary gland are evoked by pulses of GnRH secreted by the hypothalamus. The location of the centre controlling the GnRH pulses and the neurotransmitter involved are not known." @default.
- W2113268288 created "2016-06-24" @default.
- W2113268288 creator A5079208561 @default.
- W2113268288 date "1984-02-01" @default.
- W2113268288 modified "2023-10-17" @default.
- W2113268288 title "FACTORS AFFECTING THE SECRETION OF LUTEINIZING HORMONE IN THE EWE" @default.
- W2113268288 cites W102783742 @default.
- W2113268288 cites W1539562977 @default.
- W2113268288 cites W1736071032 @default.
- W2113268288 cites W1819794898 @default.
- W2113268288 cites W1854865760 @default.
- W2113268288 cites W1861546400 @default.
- W2113268288 cites W1886973282 @default.
- W2113268288 cites W1940299196 @default.
- W2113268288 cites W1963523681 @default.
- W2113268288 cites W1963698755 @default.
- W2113268288 cites W1963772145 @default.
- W2113268288 cites W1963970015 @default.
- W2113268288 cites W1964336043 @default.
- W2113268288 cites W1964784878 @default.
- W2113268288 cites W1964816895 @default.
- W2113268288 cites W1965286557 @default.
- W2113268288 cites W1965546416 @default.
- W2113268288 cites W1966169469 @default.
- W2113268288 cites W1966289543 @default.
- W2113268288 cites W1966784992 @default.
- W2113268288 cites W1967040730 @default.
- W2113268288 cites W1967697093 @default.
- W2113268288 cites W1967865251 @default.
- W2113268288 cites W1967947173 @default.
- W2113268288 cites W1968381849 @default.
- W2113268288 cites W1969341401 @default.
- W2113268288 cites W1969424793 @default.
- W2113268288 cites W1969480265 @default.
- W2113268288 cites W1969931140 @default.
- W2113268288 cites W1970455982 @default.
- W2113268288 cites W1970980002 @default.
- W2113268288 cites W1971774392 @default.
- W2113268288 cites W1971812656 @default.
- W2113268288 cites W1971984317 @default.
- W2113268288 cites W1972456243 @default.
- W2113268288 cites W1972990997 @default.
- W2113268288 cites W1973136490 @default.
- W2113268288 cites W1974037835 @default.
- W2113268288 cites W1975223912 @default.
- W2113268288 cites W1975760760 @default.
- W2113268288 cites W1976079891 @default.
- W2113268288 cites W1976264874 @default.
- W2113268288 cites W1976556233 @default.
- W2113268288 cites W1976627684 @default.
- W2113268288 cites W1977654369 @default.
- W2113268288 cites W1978084400 @default.
- W2113268288 cites W1978308275 @default.
- W2113268288 cites W1978485664 @default.
- W2113268288 cites W1978528790 @default.
- W2113268288 cites W1978574139 @default.
- W2113268288 cites W1978698129 @default.
- W2113268288 cites W1979777675 @default.
- W2113268288 cites W1980074653 @default.
- W2113268288 cites W1980500318 @default.
- W2113268288 cites W1981053901 @default.
- W2113268288 cites W1981064972 @default.
- W2113268288 cites W1982276551 @default.
- W2113268288 cites W1982508091 @default.
- W2113268288 cites W1982724252 @default.
- W2113268288 cites W1983007571 @default.
- W2113268288 cites W1983830286 @default.
- W2113268288 cites W1983958771 @default.
- W2113268288 cites W1985399588 @default.
- W2113268288 cites W1986187758 @default.
- W2113268288 cites W1986637008 @default.
- W2113268288 cites W1986660193 @default.
- W2113268288 cites W1986710366 @default.
- W2113268288 cites W1986735629 @default.
- W2113268288 cites W1987044397 @default.
- W2113268288 cites W1987278044 @default.
- W2113268288 cites W1988143748 @default.
- W2113268288 cites W1988427901 @default.
- W2113268288 cites W1989132953 @default.
- W2113268288 cites W1989606049 @default.
- W2113268288 cites W1989876740 @default.
- W2113268288 cites W1990280547 @default.
- W2113268288 cites W1991222552 @default.
- W2113268288 cites W1991461679 @default.
- W2113268288 cites W1991597219 @default.
- W2113268288 cites W1991619614 @default.
- W2113268288 cites W1992077550 @default.
- W2113268288 cites W1992132507 @default.
- W2113268288 cites W1992462878 @default.
- W2113268288 cites W1992809760 @default.
- W2113268288 cites W1993286466 @default.
- W2113268288 cites W1993539467 @default.
- W2113268288 cites W1994609339 @default.
- W2113268288 cites W1995050627 @default.
- W2113268288 cites W1995184606 @default.
- W2113268288 cites W1996046925 @default.
- W2113268288 cites W1996592687 @default.
- W2113268288 cites W1997431628 @default.