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פותח על ידי קלירמאש פתרונות בע"מ -
Vascular sources of amino acids for milk protein synthesis in goats at two stages of lactation
Year:
2002
Source of publication :
Journal of Dairy Science
Authors :
מבג'יש, סמיר
;
.
Volume :
85
Co-Authors:
Mabjeesh, S.J., Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, United Kingdom, Department of Animal Science, Faculty of Agricultural, Food and Environ. Quality Sciences, P. O. Box 12, Rehovot 76100, Israel
Kyle, C.E., Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, United Kingdom
MacRae, J.C., Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, United Kingdom
Hanigan, M.D., Dairy Research Group, Purina Mills Inc., St. Louis, MO 63144, United States
Bequette, B.J., Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, United Kingdom, Dept. of Animal and Avian Sciences, University of Maryland, College Park, MD 20742, United States
Facilitators :
From page:
919
To page:
929
(
Total pages:
11
)
Abstract:
An arteriovenous technique, combined with a 30-h i.v. infusion of [5- 13CH3]Met and [5,5,5-2H]Leu, was used to monitor mammary uptake of free amino acid (AA) and to estimate the proportion of casein synthesized from circulating peptides in goats in early and late lactation. At both stages, kinetics was performed on the last day of consecutive 5.5-d periods. The first period was an i.v. infusion of saline and the second an i.v. infusion of lysine (8.9 g/h) plus methionine (2 g/h). Net uptake of essential AA and protein yields were higher in early than in late lactation. Uptake of free Met, His, and Pro was less than, uptake of Tyr and Lys was equal to, and uptake of Arg, Leu, Val, and Ile was greater than milk protein synthesis. Peptide uptake, estimated from the difference in casein and plasma free AA enrichment, accounted for a larger fraction of casein-Met (17 vs. 8%) and casein-Leu (27 vs. 12%) in late than in early lactation. Small decreases in mammary blood flow, AA transport activity, and AA concentrations accounted for the lower uptake of AA in late compared with early lactation. Based on our studies of several AA, the utilization of circulating peptides for casein synthesis appears to be a general phenomenon.
Note:
Related Files :
Amino Acids
Animal
Animals
biosynthesis
Blood
Carbon
Female
goats
lactation
metabolism
עוד תגיות
תוכן קשור
More details
DOI :
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
25078
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:12
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Scientific Publication
Vascular sources of amino acids for milk protein synthesis in goats at two stages of lactation
85
Mabjeesh, S.J., Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, United Kingdom, Department of Animal Science, Faculty of Agricultural, Food and Environ. Quality Sciences, P. O. Box 12, Rehovot 76100, Israel
Kyle, C.E., Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, United Kingdom
MacRae, J.C., Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, United Kingdom
Hanigan, M.D., Dairy Research Group, Purina Mills Inc., St. Louis, MO 63144, United States
Bequette, B.J., Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, United Kingdom, Dept. of Animal and Avian Sciences, University of Maryland, College Park, MD 20742, United States
Vascular sources of amino acids for milk protein synthesis in goats at two stages of lactation
An arteriovenous technique, combined with a 30-h i.v. infusion of [5- 13CH3]Met and [5,5,5-2H]Leu, was used to monitor mammary uptake of free amino acid (AA) and to estimate the proportion of casein synthesized from circulating peptides in goats in early and late lactation. At both stages, kinetics was performed on the last day of consecutive 5.5-d periods. The first period was an i.v. infusion of saline and the second an i.v. infusion of lysine (8.9 g/h) plus methionine (2 g/h). Net uptake of essential AA and protein yields were higher in early than in late lactation. Uptake of free Met, His, and Pro was less than, uptake of Tyr and Lys was equal to, and uptake of Arg, Leu, Val, and Ile was greater than milk protein synthesis. Peptide uptake, estimated from the difference in casein and plasma free AA enrichment, accounted for a larger fraction of casein-Met (17 vs. 8%) and casein-Leu (27 vs. 12%) in late than in early lactation. Small decreases in mammary blood flow, AA transport activity, and AA concentrations accounted for the lower uptake of AA in late compared with early lactation. Based on our studies of several AA, the utilization of circulating peptides for casein synthesis appears to be a general phenomenon.
Scientific Publication
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