Pulsatile release of luteinising hormone during the luteal phase in lactating and weaned sows.

Pulsatile release of luteinising hormone during the luteal phase in lactating and weaned sows. Research Abstract Details 

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Pulsatile release of luteinising hormone during the luteal phase in lactating and weaned sows. Abstract Text:

P Langendijk,S J Dieleman,R Gerritsen,W Hazeleger,M-L Mainsant,N M Soede,B Kemp,P Langendijk,S J Dieleman,R Gerritsen,W Hazeleger,M-L Mainsant,N M Soede,B Kemp,P Langendijk,S J Dieleman,R Gerritsen,W Hazeleger,M-L Mainsant,N M Soede,B Kemp,

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.

Pulsatile release of luteinising hormone during the luteal phase in lactating and weaned sows. Publishing Authors By Initials

P Langendijk,SJ Dieleman,R Gerritsen,W Hazeleger,ML Mainsant,NM Soede,B Kemp,P Langendijk,SJ Dieleman,R Gerritsen,W Hazeleger,ML Mainsant,NM Soede,B Kemp,P Langendijk,SJ Dieleman,R Gerritsen,W Hazeleger,ML Mainsant,NM Soede,B Kemp,

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Pulsatile release of luteinising hormone during the luteal phase in lactating and weaned sows. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Reproduction, fertility, and development

VOLUME: 19

Page Numbers: 961-6

Journal Abbreviation: Reprod. Fertil. Dev.

ISSN: 1031-3613

DAY: 13

MONTH: 12

YEAR: 2007

Pulsatile release of luteinising hormone during the luteal phase in lactating and weaned sows. Information

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LANGUAGE: eng

NlmUniqueID: 8907465

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Grant and Affiliation Information for Pulsatile release of luteinising hormone during the luteal phase in lactating and weaned sows.

AFFILIATION: South Australian Research and Development Institute, Roseworthy Campus, Roseworthy, SA 5371, Australia.

Country: Australia

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MEDLINETA: Reprod Fertil Dev

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