Plasma concentrations of gut peptides in dairy cattle increase after calving.

Plasma concentrations of gut peptides in dairy cattle increase after calving. Research Abstract Details 

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Plasma concentrations of gut peptides in dairy cattle increase after calving. Abstract Text:

A E Relling,C K Reynolds,

Effects of transition from late gestation to early lactation on plasma concentrations of glucose-dependent insulinotropic polypeptide (GIP), glucagon-like peptide 1-(7-36) amide (GLP-1), and cholecystokinin (CCK) have not been reported in cattle. The objective of the present study was to measure plasma concentrations of GLP-1, GIP, CCK, insulin, glucose, and nonesterified fatty acids in blood plasma obtained from the coccygeal vein of 32 Holstein cows at an average of 11 d before, and 5, 12, and 19 d after calving. Feed dry matter intake (DMI) averaged 14.4, 17.7, and 19.9 kg/d on d 5, 12, and 19 of lactation, respectively, as milk yield increased (30.6, 36.6, and 39.7 kg/d, respectively). Plasma concentrations of insulin and glucose were lower postpartum than prepartum, but did not differ among samples collected after calving. In contrast, plasma concentration of gut peptides increased linearly after calving, perhaps as a consequence of increased feed intake and nutrient absorption; however, the increases in plasma concentrations of GIP and GLP-1 as lactation progressed were not associated with increased DMI per se, and likely reflect the endocrine and metabolic adaptations of lacto-genesis. In contrast, increased concentration of CCK was related both to increasing days in milk and DMI. By 19 d postpartum, concentrations of GLP-1, GIP, and CCK increased by 2.3-, 1.8-, and 2.8-fold, respectively, compared with values at 11 d before calving. Although these peptides have direct and indirect effects that reduce appetite and DMI in other species (including increased insulin secretion), these may be glucose- or insulin-dependent functions, and insulin and glucose concentrations were reduced in early lactation.

Plasma concentrations of gut peptides in dairy cattle increase after calving. Publishing Authors By Initials

AE Relling,CK Reynolds,

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Plasma concentrations of gut peptides in dairy cattle increase after calving. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of dairy science

VOLUME: 90

Page Numbers: 325-30

Journal Abbreviation: J. Dairy Sci.

ISSN: 1525-3198

DAY: 21

MONTH: Jan

YEAR: 2007

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LANGUAGE: eng

NlmUniqueID: 2985126

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AFFILIATION: Department of Animal Sciences, The Ohio State University, OARDC, Wooster 44691-4096, USA.

Country: United States

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MEDLINETA: J Dairy Sci

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