| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
1 Department of Production Animal Medicine, The Norwegian School of Veterinary Science, N-0033 Oslo, Norway
2 TINE Norwegian Dairies, N-1431 Å s, Norway
Corresponding author: J. P. Valde; e-mail: jpvalde{at}online.no.
Data from the Norwegian dairy herd recording system were used to evaluate herd level criteria for good and poor udder health in dairy cows. All dairy herds with at least 10 cow-years were included (n = 12,780). The association between bulk milk somatic cell count (BMSCC) and clinical mastitis rate (CM) was weak (R2 = 0.002), indicating that studies based on BMSCC provide different information regarding udder health than studies based on CM. The strongest correlations were found between average cow milk somatic cell count (CMSCC) and BMSCC and between percentage of individual cow milk sample >200,000 cells/mL and the variables BMSCC and CMSCC. A new variable called new infection rate (NEWINF) based on individual cow somatic cell count measurements and CM was evaluated. The NEWINF is influenced by the frequency of individual cow milk samplings, and, to compare herds, it is necessary to adjust for the frequency of cow milk samplings on each farm. The NEWINF was found to be a useful tool for describing overall udder health status at the farm level, as it combines both CM and somatic cell count.
Key Words: udder health • new infection rate of mastitis • somatic cell count • clinical mastitis
Abbreviation key: ADJ-NEWINF = adjusted new infection rate of mastitis, BMSCC = bulk milk somatic cell count, CM = clinical mastitis rate, CMSCC = weighted mean cow milk (composite) somatic cell count, DELIVERY% = percentage delivered milk, DHRS = dairy herd recording system, M-DURATION = mean duration of mastitis, NEWINF = new infection rate of mastitis, N-SAMPLING = number of milk samplings, PORTION200 = percentage of individual cow milk samples >200,000 cells/mL
This article has been cited by other articles:
|
|
 |
|
  H. M. Rutigliano, F. S. Lima, R. L. A. Cerri, L. F. Greco, J. M. Vilela, V. Magalhaes, F. T. Silvestre, W. W. Thatcher, and J. E. P. Santos Effects of Method of Presynchronization and Source of Selenium on Uterine Health and Reproduction in Dairy Cows J Dairy Sci, September 1, 2008; 91(9): 3323 - 3336. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. L. Stevenson, J. A. Rodrigues, F. A. Braga, S. Bitente, J. C. Dalton, J. E. P. Santos, and R. C. Chebel Effect of Breeding Protocols and Reproductive Tract Score on Reproductive Performance of Dairy Heifers and Economic Outcome of Breeding Programs J Dairy Sci, September 1, 2008; 91(9): 3424 - 3438. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. L. Stevenson, J. C. Dalton, J. E. P. Santos, R. Sartori, A. Ahmadzadeh, and R. C. Chebel Effect of Synchronization Protocols on Follicular Development and Estradiol and Progesterone Concentrations of Dairy Heifers J Dairy Sci, August 1, 2008; 91(8): 3045 - 3056. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
E. Silva, R. A. Sterry, D. Kolb, M. C. Wiltbank, and P. M. Fricke Effect of Pretreatment with Prostaglandin F2{alpha} Before Resynchronization of Ovulation on Fertility of Lactating Dairy Cows J Dairy Sci, December 1, 2007; 90(12): 5509 - 5517. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. J. Lievaart, H. W. Barkema, W. D. J. Kremer, J. van den Broek, J. H. M. Verheijden, and J. A. P. Heesterbeek Effect of Herd Characteristics, Management Practices, and Season on Different Categories of the Herd Somatic Cell Count J Dairy Sci, September 1, 2007; 90(9): 4137 - 4144. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. J. Lievaart, W. D. J. Kremer, and H. W. Barkema Short Communication: Comparison of Bulk Milk, Yield-Corrected, and Average Somatic Cell Counts as Parameters to Summarize the Subclinical Mastitis Situation in a Dairy Herd J Dairy Sci, September 1, 2007; 90(9): 4145 - 4148. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
K. N. Galvao, M. F. Sa Filho, and J. E. P. Santos Reducing the Interval from Presynchronization to Initiation of Timed Artificial Insemination Improves Fertility in Dairy Cows J Dairy Sci, September 1, 2007; 90(9): 4212 - 4218. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. P. Valde, M. L. Lystad, E. Simensen, and O. Osteras Comparison of Feeding Management and Body Condition of Dairy Cows in Herds with Low and High Mastitis Rates J Dairy Sci, September 1, 2007; 90(9): 4317 - 4324. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
R. C. Chebel, J. E. P. Santos, R. L. A. Cerri, H. M. Rutigliano, and R. G. S. Bruno Reproduction in dairy cows following progesterone insert presynchronization and resynchronization protocols. J Dairy Sci, November 1, 2006; 89(11): 4205 - 4219. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L. Gygax and D. Nosal Short communication: contribution of vibration and noise during milking to the somatic cell count of milk. J Dairy Sci, July 1, 2006; 89(7): 2499 - 2502. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. S. Stevenson, J. R. Pursley, H. A. Garverick, P. M. Fricke, D. J. Kesler, J. S. Ottobre, and M. C. Wiltbank Treatment of cycling and noncycling lactating dairy cows with progesterone during Ovsynch. J Dairy Sci, July 1, 2006; 89(7): 2567 - 2578. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
O. Osteras, L. Solverod, and O. Reksen Milk culture results in a large Norwegian survey--effects of season, parity, days in milk, resistance, and clustering. J Dairy Sci, March 1, 2006; 89(3): 1010 - 1023. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
