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Titolo:
Prolactin and insulin levels in lactating sows in relation to nursing frequency
Autore:
Spinka, M; Illmann, G; Stetkova, Z; Krejci, P; Tomanek, M; Sedlak, L; Lidicky, J;
Indirizzi:
Res Inst Anim Prod, Grp Ethol, CZ-10400 Prague, Czech Republic Res Inst Anim Prod Prague Czech Republic CZ-10400 Prague, Czech Republic Acad Sci Czech Republ, Inst Anim Physiol & Genet, CZ-10400 Prague, Czech Republic Acad Sci Czech Republ Prague Czech Republic CZ-10400 gue, Czech Republic Biopharm AS, Dept Endocrinol, CZ-25449 Jilove U Prahy, Czech Republic Biopharm AS Jilove U Prahy Czech Republic CZ-25449 Prahy, Czech Republic
Titolo Testata:
DOMESTIC ANIMAL ENDOCRINOLOGY
fascicolo: 1, volume: 17, anno: 1999,
pagine: 53 - 64
SICI:
0739-7240(199907)17:1<53:PAILIL>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
FIRST-LITTER SOWS; BODY-WEIGHT LOSS; PLASMA PROLACTIN; PRIMIPAROUS SOWS; MILK-PRODUCTION; REPRODUCTIVE HORMONES; PORCINE PROLACTIN; TEAT STIMULATION; LARGE-WHITE; PERFORMANCE;
Keywords:
sows; lactation; insulin; prolactin; nursing; maternal behavior; milk production;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Spinka, M Res Inst Anim Prod, Grp Ethol, CZ-10400 Prague, Czech Republic Res Inst Anim Prod Prague Czech Republic CZ-10400 ech Republic
Citazione:
M. Spinka et al., "Prolactin and insulin levels in lactating sows in relation to nursing frequency", DOM ANIM EN, 17(1), 1999, pp. 53-64

Abstract

It has been established that sows up- or down-regulate their milk production as the frequency of nursings is changed. The amount of udder massage by piglets might also influence milk production. To investigate whether these effects are associated with changes in prolactin or insulin levels, we enforced five sows each to nurse either every 35 min (MIN35) or every 70 min (MIN70) over a 26- to 28-hr period. Milk production was measured during the first 24 hr of this period. During the last three to four nursings, blood was collected every 5 min. Plasma prolactin levels increased after milk ejection (P < 0.05), whereas insulin levels increased only briefly in MIN70 sows. Sows nursing every 35 min had lower basal (P < 0.001) and maximal (P < 0.05) concentrations of insulin than MIN70 sows. There were no differences between the two groups in prolactin levels. Nursings with a postejection udder massage longer than 90 s tended to induce a higher increase in prolactin (P < 0.1) than nursings with a shorter massage. When the effects of imposednursing frequency were removed, there was an across-sows positive residualcorrelation between average prolactin levels (P < 0.05) and the duration of post-ejection udder massage during the preceding 24 hr. We conclude that when milk production of a sow is changed by altering the nursing frequency within natural limits, the necessary alteration in catabolic state of energy metabolism may be associated with altered insulin levels. The duration ofudder massage in a single nursing might have only a slight immediate impact on prolactin levels, but: may influence prolactin levels more substantially if increased for a period of 24 hr. (C) 1999 Elsevier Science Inc. All rights reserved.

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Documento generato il 02/12/20 alle ore 15:06:39