| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
1 Department of Animal Sciences, Animal Health Section, University of Vermont, Burlington 05401
Monthly bulk tank milk samples and veterinary records were analyzed for 1 yr on 15 Vermont dairy farms. Data were evaluated using ANOVA to compare effects of grazing management systems on milk quality and udder health. Systems evaluated were intensively managed rotational grazing, traditional continuous grazing, and confinement housing. Bulk tank samples were evaluated for standard plate count, bacterial type counts on tryptose-blood-esculin agar, and SCC. Veterinary records were evaluated for incidence of clinical mastitis, udder edema, and teat injuries. Within- and between-treatment group analyses were conducted by season, herd size, and udder sanitation systems. Mean standard plate counts were lower in rotationally grazed herds than counts of confined herds during the grazing season. Similarly, rotationally grazed herds with fewer than 60 cows had lower standard plate counts than confined herds of similar size. Mean bulk tank counts of streptococci other than Streptococcus agalactiae during the grazing season differed among treatments. The lowest counts occurred in rotationally grazed herds. Among herd using predip products recognized as efficacious, fewer streptococci other than S. agalactiae were isolated from bulk tank milk of rotationally grazed herds than confined herds. Rotationally grazed herds using postdips recognized as efficacious had lower SCC than those using unrecognized postdips. No udder health differences were observed among grazing treatments.
Key Words: grazing • bulk tank milk quality • udder health
Submitted on January 14, 1991
Accepted on June 28, 1991
This article has been cited by other articles:
|
|
 |
|
  R. W. McDowell, Z. Dou, J. D. Toth, B. J. Cade-Menun, P. J. A. Kleinman, K. Soder, and L. Saporito A Comparison of Phosphorus Speciation and Potential Bioavailability in Feed and Feces of Different Dairy Herds Using 31P Nuclear Magnetic Resonance Spectroscopy J. Environ. Qual., May 1, 2008; 37(3): 741 - 752. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 R. G. M. O. Riekerink, H. W. Barkema, and H. Stryhn The Effect of Season on Somatic Cell Count and the Incidence of Clinical Mastitis J Dairy Sci, April 1, 2007; 90(4): 1704 - 1715. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. P. Russelle, M. H. Entz, and A. J. Franzluebbers Reconsidering Integrated Crop-Livestock Systems in North America Agron. J., February 6, 2007; 99(2): 325 - 334. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. Gonzalo, J. A. Carriedo, E. Beneitez, M. T. Juarez, L. F. De La Fuente, and F. San Primitivo Short Communication: Bulk Tank Total Bacterial Count in Dairy Sheep: Factors of Variation and Relationship with Somatic Cell Count J Dairy Sci, February 1, 2006; 89(2): 549 - 552. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. A. Sanderson, K. J. Soder, L. D. Muller, K. D. Klement, R. H. Skinner, and S. C. Goslee Forage Mixture Productivity and Botanical Composition in Pastures Grazed by Dairy Cattle Agron. J., September 19, 2005; 97(5): 1465 - 1471. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. P. McCue Letter to the Editor: Management of Bacterial Burden in Cattle by TiO2 from Grazing J Dairy Sci, June 1, 2004; 87(6): 1579 - 1579. [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
