| Whole-body fluxes and partitioning of amino acids to the mammary gland of cows fed fresh pasture at two levels of intake during early lactation. | |
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MedLine Citation:
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PMID: 12908887 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The utilisation of essential amino acids (EAA) by the mammary gland of lactating dairy cows fed fresh forages was studied to provide basic information useful in designing strategies to increase the production of milk protein from pasture-fed dairy cows. The relationship between the flux of EAA in the whole body and their uptake by the mammary gland was determined in four cows in early lactation (length of time in milk 44 (SD 14.5) d) producing 21 (SD 4.0) kg milk/d. The cows were maintained in metabolism stalls and fed fresh perennial ryegrass (Lolium perenne) and white clover (Trifolium repens) pasture ad libitum or restricted to 75 % ad libitum intake. The whole-body fluxes of amino acids (AA) were measured using an arterio-venous infusion of universally (13)C-labelled AA. Whole-body fluxes of fourteen AA were estimated. Isotope dilution indicated that mammary utilisation accounted for one-third of the whole-body flux of EAA, with individual AA ranging between 17 and 35 %. Isoleucine, leucine, valine and lysine were the EAA with the greatest partitioning towards the mammary gland (up to 36 % of the whole-body flux), which could reflect a potentially limiting effect on milk protein synthesis. In the case of AA with low partitioning to the mammary gland (for example, histidine), it is suggested that non-mammary tissues may have priority over the mammary gland and therefore the supply of this AA may also limit milk protein synthesis. |
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Authors:
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D Pacheco; M H Tavendale; G W Reynolds; T N Barry; J Lee; W C McNabb |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The British journal of nutrition Volume: 90 ISSN: 0007-1145 ISO Abbreviation: Br. J. Nutr. Publication Date: 2003 Aug |
Date Detail:
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Created Date: 2003-08-11 Completed Date: 2003-09-15 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0372547 Medline TA: Br J Nutr Country: England |
Other Details:
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Languages: eng Pagination: 271-81 Citation Subset: IM |
Affiliation:
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Nutrition and Behaviour, AgResearch Ltd, and Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Amino Acids
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blood,
metabolism* Animal Feed Animals Cattle / metabolism* Female Isoleucine / metabolism Lactation / metabolism* Leucine / metabolism Lysine / metabolism Mammary Glands, Animal / metabolism* Nitrogen / metabolism Poaceae Valine / metabolism |
| Chemical | |
Reg. No./Substance:
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0/Amino Acids; 56-87-1/Lysine; 61-90-5/Leucine; 7004-03-7/Valine; 73-32-5/Isoleucine; 7727-37-9/Nitrogen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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