| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
1 Department of Animal Sciences, The University of Arizona, Tucson 85721
2 Department of Animal Science, Cornell University, Ithaca, NY 14853
Corresponding author: Lance H. Baumgard; e-mail: baumgard{at}ag.arizona.edu.
Mixed conjugated linoleic acid (CLA) isomers decrease milk fat synthesis during established lactation, but their ability to cause milk fat depression (MFD) immediately postpartum remains unclear. Multiparous Holstein cows (n = 19) were randomly assigned to 1 of 4 doses of rumen-protected (RP) CLA supplements (0, 200, 400, and 600 g/d); each dose provided equal amounts of fatty acids by replacing and balancing treatments with an RP supplement of palm fatty acid distallate. Doses provided a total of 468 g fatty acids/d and 0, 62, 125, or 187 g of mixed CLA isomers/d, respectively. The CLA supplement contained a variety of CLA isomers: 5.4% trans-8, cis-10; 6.3% cis-9, trans-11; 7.9% trans-10, cis-12; and 8.2% cis-11, trans-13 CLA. Each group received treatments from approximately –10 to 21 d relative to calving. To improve palatability and ensure complete consumption, doses were mixed with equal amounts of steam-flaked corn and dried molasses; one-half the supplement was fed at 0600 h, and the remaining supplement was fed at 1800 h. Milk yield and individual feed intake were recorded daily, and milk samples were obtained from each cow every 2nd day (at both milkings) starting on d 1 postpartum. There were no differences in dry matter intake (17.1 kg/d), milk yield (34.2 kg/d), protein content (3.74%), lactose content (4.61%), or yield of milk protein or lactose. The CLA supplementation decreased overall milk fat content in a dose-responsive manner (4.57, 3.97, 3.32, and 3.10, respectively), and milk fat yield displayed the same progressive decline. The dose-dependent decrease in milk fat content was evident during wk 1 and became highly significant during wk 2 and 3. The milk fat yield response pattern was similar, and by d 21, the highest RP-CLA supplement decreased milk fat content and yield by 49 and 56%, respectively. These data clearly indicate RP-CLA can markedly (40 to 50%) induce MFD immediately postpartum without negatively affecting other production parameters.
Key Words: conjugated linoleic acid • milk fat • transition period • dairy cow
Abbreviation key: CLA = conjugated linoleic acid, EBAL = energy balance, MFD = milk fat depression, NEBAL = negative EBAL, RP = rumen-protected
This article has been cited by other articles:
|
|
 |
|
  M. Carriquiry, W. J. Weber, C. R. Dahlen, G. C. Lamb, L. H. Baumgard, and B. A. Crooker Fatty acid composition of milk from multiparous Holstein cows treated with bovine somatotropin and fed n-3 fatty acids in early lactation J Dairy Sci, October 1, 2009; 92(10): 4865 - 4875. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
G. Shwartz, M. L. Rhoads, M. J. VanBaale, R. P. Rhoads, and L. H. Baumgard Effects of a supplemental yeast culture on heat-stressed lactating Holstein cows J Dairy Sci, March 1, 2009; 92(3): 935 - 942. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
R. Gervais and P. Y. Chouinard Effects of Intravenous Infusion of Conjugated Diene 18:3 Isomers on Milk Fat Synthesis in Lactating Dairy Cows J Dairy Sci, September 1, 2008; 91(9): 3568 - 3578. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 D. E. Bauman, J. W. Perfield II, K. J. Harvatine, and L. H. Baumgard Regulation of Fat Synthesis by Conjugated Linoleic Acid: Lactation and the Ruminant Model J. Nutr., February 1, 2008; 138(2): 403 - 409. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. K. Kay, T. R. Mackle, D. E. Bauman, N. A. Thomson, and L. H. Baumgard Effects of a Supplement Containing Trans-10, Cis-12 Conjugated Linoleic Acid on Bioenergetic and Milk Production Parameters in Grazing Dairy Cows Offered Ad Libitum or Restricted Pasture J Dairy Sci, February 1, 2007; 90(2): 721 - 730. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L. J. Odens, R. Burgos, M. Innocenti, M. J. VanBaale, and L. H. Baumgard Effects of Varying Doses of Supplemental Conjugated Linoleic Acid on Production and Energetic Variables During the Transition Period J Dairy Sci, January 1, 2007; 90(1): 293 - 305. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. J. de Veth, E. Castaneda-Gutierrez, D. A. Dwyer, A. M. Pfeiffer, D. E. Putnam, and D. E. Bauman Response to Conjugated Linoleic Acid in Dairy Cows Differing in Energy and Protein Status J Dairy Sci, December 1, 2006; 89(12): 4620 - 4631. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. K. Kay, W. J. Weber, C. E. Moore, D. E. Bauman, L. B. Hansen, H. Chester-Jones, B. A. Crooker, and L. H. Baumgard Effects of Week of Lactation and Genetic Selection for Milk Yield on Milk Fatty Acid Composition in Holstein Cows J Dairy Sci, November 1, 2005; 88(11): 3886 - 3893. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. J. VanBaale, D. R. Ledwith, J. M. Thompson, R. Burgos, R. J. Collier, and L. H. Baumgard Effect of Increased Milking Frequency in Early Lactation With or Without Recombinant Bovine Somatotropin J Dairy Sci, November 1, 2005; 88(11): 3905 - 3912. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. J. de Veth, S. K. Gulati, N. D. Luchini, and D. E. Bauman Comparison of Calcium Salts and Formaldehyde-Protected Conjugated Linoleic Acid in Inducing Milk Fat Depression J Dairy Sci, May 1, 2005; 88(5): 1685 - 1693. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. E. Moore, J. K. Kay, R. J. Collier, M. J. VanBaale, and L. H. Baumgard Effect of Supplemental Conjugated Linoleic Acids on Heat-Stressed Brown Swiss and Holstein Cows J Dairy Sci, May 1, 2005; 88(5): 1732 - 1740. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
E. Castaneda-Gutierrez, T. R. Overton, W. R. Butler, and D. E. Bauman Dietary Supplements of Two Doses of Calcium Salts of Conjugated Linoleic Acid During the Transition Period and Early Lactation J Dairy Sci, March 1, 2005; 88(3): 1078 - 1089. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
