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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

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Record number 358735
Title Pulsatile release of luteinising hormone during the luteal phase in lactating and weaned sows
Author(s) Langendijk, P.; Dieleman, S.J.; Gerritsen, R.; Hazeleger, W.; Mainsant, M.L.; Soede, N.M.; Kemp, B.
Source Reproduction Fertility and Development 19 (2007)8. - ISSN 1031-3613 - p. 961 - 966.
Department(s) Adaptation Physiology
Publication type Refereed Article in a scientific journal
Publication year 2007
Keyword(s) early-pregnancy - lh - secretion - pigs - progesterone - prolactin - gilts - time
Abstract The present paper describes luteal phase luteinising hormone (LH) in sows that ovulated due to a limited nursing regimen (LN). The LN regimen was imposed either at Day 14 or at Day 21 of lactation. At ovulation, lactation was terminated (n = 8) or sows remained lactating throughout early pregnancy (n = 8). Blood samples were collected every 15 min for 8 h during the day, around Day 11 after ovulation. In addition, lactating sows were bled during the night, when piglets were allowed to suckle. The LH pattern was typical for the luteal phase, with one to five pulses per 8 h. The LH characteristics (frequency, base, average, pulse area) did not differ between lactating and weaned sows, except for the amplitude of LH pulses, which was higher in weaned sows compared with lactating sows (1.22 ± 0.15 v. 0.76 ± 0.11 ng mL¿1, respectively; P <0.05). In lactating sows, average LH, basal LH and the frequency of LH pulses were significantly lower during the night, when piglets were allowed to suckle. The sage of lactation at which LN was imposed did not influence LH. In conclusion, it is unlikely that the small difference in LH explains the considerable difference between lactating and weaned sows in progesterone at Day 12 of pregnancy (24.1 ± 1.3 v. 43.3 ± 4.0 ng mL¿1, respectively; P <0.01). Moreover, the difference in progesterone already exists during the early luteal phase (Day 0¿10), when secretion of the corpora lutea is still independent of LH.
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