Blood plasma concentrations of metabolic hormones and glucose during extended lactation in grazing cows or cows fed a total mixed ration

Delany, K. K., Macmillan, K. L., Grainger, C., Thomson, P. C., Blache, D., Nicholas, K. R. and Auldist, M. J. 2010, Blood plasma concentrations of metabolic hormones and glucose during extended lactation in grazing cows or cows fed a total mixed ration, Journal of dairy science, vol. 93, no. 12, pp. 5913-5920.

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Title Blood plasma concentrations of metabolic hormones and glucose during extended lactation in grazing cows or cows fed a total mixed ration
Author(s) Delany, K. K.
Macmillan, K. L.
Grainger, C.
Thomson, P. C.
Blache, D.
Nicholas, K. R.
Auldist, M. J.
Journal name Journal of dairy science
Volume number 93
Issue number 12
Start page 5913
End page 5920
Total pages 8
Publisher American Dairy Science Association
Place of publication New York, N.Y.
Publication date 2010-12
ISSN 1525-3198
0022-0302
Keyword(s) pasture
hormone
total mixed ration
energy
Summary An experiment was conducted to measure the effect of diet on circulating concentrations of metabolic hormones and metabolites in cows undergoing extended lactations. Two groups of 6 Holstein-Friesian cows managed for lactations of 670 d were used in the experiment. One group was fully fed on a total mixed ration (TMR), whereas the other group grazed fresh pasture supplemented with grain (P+G). On 7 occasions between 332 and 612 d in milk, concentrations of metabolic hormones and glucose were measured in the blood plasma of each cow. Cows fed TMR gained more weight and body condition than P+G cows, but did not produce more milk during the study period. Only 3 of the TMR cows continued to lactate until 612 d in milk compared with all 6 of the P+G cows. Blood plasma from cows fed TMR had higher concentrations of glucose, insulin, glucagon, insulin-like growth factor 1, and leptin, but lower concentrations of growth hormone, than that from P+G cows. These changes were consistent with the preferential deposition of energy into adipose tissue at the expense of milk production and presumably were induced by a diet that provided precursors for gluconeogenesis that were in excess of the requirements for maintenance and prevailing milk production. The mechanism responsible for some TMR cows putting on excess weight and reducing or ceasing milk production is uncertain, but this observation has important implications for the nutritional management of cows in extended lactation programs.
Language eng
Field of Research 060199 Biochemistry and Cell Biology not elsewhere classified
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
HERDC collection year 2010
Copyright notice ©2010, American Dairy Science association
Persistent URL http://hdl.handle.net/10536/DRO/DU:30035326

Document type: Journal Article
Collection: Centre for Biotechnology and Interdisciplinary Sciences (BioDeakin)
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