| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
Department of Animal Science, Michigan State University, East Lansing 48824 and Department of Dairy Science, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster 44691
ABSTRACT
Methionine hydroxy analog has been proposed to stimulate hepatic lipoprotein synthesis and incorporation of plasma fatty acids into plasma triglyceride. Seven cows were fed diets containing 0 or 30 g analog/d starting 14 d prepartum. At approximately 30 and 60 d postpartum, cows were continuously infused intravenously with 1-[14C] palmitic acid for 160 min to achieve steady-state labeling of plasma fatty acid and triglyceride. Turnover of fatty acid and transfer quotients for triglyceride and CO2 were 3.3 and 2.7 mmol min–1; 13.0 and 10.0%; and 8.0 and 5.0%, for control and analog, respectively. Proportion of fatty acid turnover incorporated into triglyceride and CO2 were 14.0 and 15.0%; and 21.0 and 18.0, respectively, for control and analog. Analog increased 14C recovered in milk fat (52 vs. 36%). Plasma concentration of fatty acids, percent oxidized to CO2, and percent of CO2 from fatty acids decreased with increasing lactation days. Milk fat percent and yield, fatty acid turnover, and oxidation were positively correlated with concentration of plasma fatty acids, whereas fatty acid incorporated into plasma triglyceride was negatively correlated with fatty acid concentration. The data suggest that hepatic triglyceride secretion is not increased in early lactation; further, no effects of analog on lipid metabolism were detected.
1 Salaries and research support provided by state and federal funds appropriated to The Ohio State University, Ohio Agricultural Research and Development Center, and by Monsanto Co., St. Louis, MO. Manuscript Number 106-88.
2 Department of Animal Science, Michigan State University, East Lansing 48824.
3 Present address: Young's, Inc., Roaring Springs, PA 16673.
4 Department of Dairy Science, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster, OH 44691.
This article has been cited by other articles:
|
|
 |
|
  M. D. Hanigan, C. C. Palliser, and P. Gregorini Altering the representation of hormones and adding consideration of gestational metabolism in a metabolic cow model reduced prediction errors J Dairy Sci, October 1, 2009; 92(10): 5043 - 5056. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
B. N. Ametaj, D. G. V. Emmanuel, Q. Zebeli, and S. M. Dunn Feeding high proportions of barley grain in a total mixed ration perturbs diurnal patterns of plasma metabolites in lactating dairy cows J Dairy Sci, March 1, 2009; 92(3): 1084 - 1091. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
V. R. Osborne, N. E. Odongo, J. P. Cant, K. C. Swanson, and B. W. McBride Effects of supplementing glycerol and soybean oil in drinking water on feed and water intake, energy balance, and production performance of periparturient dairy cows J Dairy Sci, February 1, 2009; 92(2): 698 - 707. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L. A. Winkelman, T. H. Elsasser, and C. K. Reynolds Limit-Feeding a High-Energy Diet to Meet Energy Requirements in the Dry Period Alters Plasma Metabolite Concentrations but Does Not Affect Intake or Milk Production in Early Lactation J Dairy Sci, March 1, 2008; 91(3): 1067 - 1079. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Guo, R. R. Peters, and R. A. Kohn Effect of a Transition Diet on Production Performance and Metabolism in Periparturient Dairy Cows J Dairy Sci, November 1, 2007; 90(11): 5247 - 5258. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 S. Hachenberg, C. Weinkauf, S. Hiss, and H. Sauerwein Evaluation of classification modes potentially suitable to identify metabolic stress in healthy dairy cows during the peripartal period J Anim Sci, August 1, 2007; 85(8): 1923 - 1932. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
