| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
1 Dairying Research Corporation Ltd., Private Bag 3123, Ruakura Research Centre, Hamilton, New Zealand
2 AgResearch, Private Bag 3123, Ruakura Research Centre, Hamilton, New Zealand
Twenty-four monozygous twinsets in late lactation (>210 d in milk) were used to examine the effects of feed restriction and milking frequency prior to drying off on milk yield and composition in a pastoral dairying system. Cows were assigned to one of four treatment groups for 26 d and were milked either twice or once daily and given either unrestricted or restricted access to feed. Dry matter intakes averaged 16 or 8 kg per cow per day, and diets comprised ryegrass and white clover pasture supplemented with 15% pasture silage.
Feed restriction and once daily milking reduced milk yield and increased concentrations of milk fat and protein. Somatic cell count was increased by feed restriction only. Production losses caused by feed restriction were nearly threefold higher than were those for once daily milking. Yields of components that were mammary synthesized and serum derived were reduced by feed restriction, in accordance with milk volume reduction. Plasma lactose concentration increased with once daily milking only and indicated enhanced permeability of mammary tight junctions. Both feed restriction and once daily milking compromised milk quality, but increased leakage of serum components into milk via mammary tight junctions was deemed to occur only for once daily milking.
Key Words: milk composition • once daily milking • tight junctions • late lactation
Submitted on July 13, 1998
Accepted on February 8, 1999
This article has been cited by other articles:
|
|
 |
|
  F. Abeni, M. G. Terzano, M. Speroni, L. Migliorati, M. Capelletti, F. Calza, L. Bianchi, and G. Pirlo Evaluation of Milk Enzymes and Electrolytes, Plasma Metabolites, and Oxidative Status in Twin Cows Milked in an Automatic Milking System or Twice Daily in a Conventional Milking Parlor J Dairy Sci, September 1, 2008; 91(9): 3372 - 3384. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
V. Castillo, X. Such, G. Caja, R. Casals, E. Albanell, and A. A. K. Salama Effect of Milking Interval on Milk Secretion and Mammary Tight Junction Permeability in Dairy Ewes J Dairy Sci, July 1, 2008; 91(7): 2610 - 2619. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Guinard-Flament, E. Delamaire, P. Lamberton, and J. L. Peyraud Adaptations of Mammary Uptake and Nutrient Use to Once-Daily Milking and Feed Restriction in Dairy Cows J Dairy Sci, November 1, 2007; 90(11): 5062 - 5072. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
G. Theodorou, A. Kominakis, E. Rogdakis, and I. Politis Factors Affecting the Plasmin-Plasminogen System in Milk Obtained from Three Greek Dairy Sheep Breeds with Major Differences in Milk Production Capacity J Dairy Sci, July 1, 2007; 90(7): 3263 - 3269. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. O. Odensten, B. Berglund, K. P. Waller, and K. Holtenius Metabolism and Udder Health at Dry-Off in Cows of Different Breeds and Production Levels J Dairy Sci, March 1, 2007; 90(3): 1417 - 1428. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Norgaard, A. Sorensen, M. T. Sorensen, J. B. Andersen, and K. Sejrsen Mammary Cell Turnover and Enzyme Activity in Dairy Cows: Effects of Milking Frequency and Diet Energy Density J Dairy Sci, March 1, 2005; 88(3): 975 - 982. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. A. K. Salama, X. Such, G. Caja, M. Rovai, R. Casals, E. Albanell, M. P. Marin, and A. Marti Effects of Once Versus Twice Daily Milking Throughout Lactation on Milk Yield and Milk Composition in Dairy Goats J Dairy Sci, May 1, 2003; 86(5): 1673 - 1680. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. W. Smith, L. O. Ely, W. M. Graves, and W. D. Gilson Effect of Milking Frequency on DHI Performance Measures J Dairy Sci, December 1, 2002; 85(12): 3526 - 3533. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
