| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
* Nutritional Physiology, Department of Animal Science, Iowa State University, Ames 50011
Department of Animal Science and Industry, Kansas State University, Manhattan 66506
Animal Breeding and Genetics, Department of Animal Science, Iowa State University, Ames 50011
3 Corresponding author: dcbeitz{at}iastate.edu
Interest in changing the milk fatty acid profile is growing. However, little is known about the genetic variability of milk fatty acids in the US Holstein population. Therefore, genetic parameters for milk fatty acids were estimated using a single-trait, mixed, linear animal model on 592 individual milk samples from 233 daughters of 53 sires in a cow herd genetically representative of the US Holstein population. Heritability (h2) and repeatability (r) estimates ± standard errors for yields of individual fatty acids ranged from 0.00 ± 0.08 (C4:0) to 0.43 ± 0.13 (C12:0) for heritabilities and from 0.21 ± 0.05 (C18:1) to 0.43 ± 0.05 (C12:0) for repeatabilities. Saturated (h2 = 0.23 ± 0.12; r = 0.36 ± 0.05) and de novo synthesized fatty acids (C6:0 to C14:0; h2 = 0.30 ± 0.13; r = 0.40 ± 0.05) had numerically higher estimates than did monounsaturated (h2 = 0.09 ± 0.09; r = 0.22 ± 0.05) and polyunsaturated fatty acids (h2 = 0.08 ± 0.09; r = 0.27 ± 0.05). For relative proportions of individual fatty acids, the greatest heritability and repeatability estimates were obtained for C8:0 (h2 = 0.18 ± 0.12; r = 0.36 ± 0.05), C10:0 (h2 = 0.22 ± 0.13; r = 0.46 ± 0.05), C12:0 (h2 = 0.18 ± 0.12; r = 0.46 ± 0.05), C16:0 (h2 = 0.09 ± 0.12; r = 0.48 ± 0.05), C16:1 (h2 = 0.49 ± 0.13; r = 0.49 ± 0.05), and C18:0 (h2 = 0.24 ± 0.11; r = 0.39 ± 0.05). Our results suggest the existence of genetic variability of milk fatty acids, in particular of medium-and long-chain fatty acids (C8:0 to C18:0), which could be used to improve the nutritional and textural properties of milk fat by selective breeding.
Key Words: dairy cow • genetic variation • heritability • milk fatty acid
This article has been cited by other articles:
|
|
 |
|
  R. M. Demeter, G. C. B. Schopen, A. G. J. M. O. Lansink, M. P. M. Meuwissen, and J. A. M. van Arendonk Effects of milk fat composition, DGAT1, and SCD1 on fertility traits in Dutch Holstein cattle J Dairy Sci, November 1, 2009; 92(11): 5720 - 5729. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
W. M. Stoop, A. Schennink, M. H. P. W. Visker, E. Mullaart, J. A. M. van Arendonk, and H. Bovenhuis Genome-wide scan for bovine milk-fat composition. I. Quantitative trait loci for short- and medium-chain fatty acids J Dairy Sci, September 1, 2009; 92(9): 4664 - 4675. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. Schennink, W. M. Stoop, M. H. P. W. Visker, J. J. van der Poel, H. Bovenhuis, and J. A. M. van Arendonk Short communication: Genome-wide scan for bovine milk-fat composition. II. Quantitative trait loci for long-chain fatty acids J Dairy Sci, September 1, 2009; 92(9): 4676 - 4682. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L. F. De La Fuente, E. Barbosa, J. A. Carriedo, C. Gonzalo, R. Arenas, J. M. Fresno, and F. San Primitivo Factors influencing variation of fatty acid content in ovine milk J Dairy Sci, August 1, 2009; 92(8): 3791 - 3799. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. Mele, R. Dal Zotto, M. Cassandro, G. Conte, A. Serra, A. Buccioni, G. Bittante, and P. Secchiari Genetic parameters for conjugated linoleic acid, selected milk fatty acids, and milk fatty acid unsaturation of Italian Holstein-Friesian cows J Dairy Sci, January 1, 2009; 92(1): 392 - 400. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
