| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
1 Department of Animal Science, Cornell University, Ithaca, NY 14853-4801
2 Monsanto Corporation, Dairy Business, St. Louis, MO 63198
The commercial response to bovine somatotropin was examined in northeast dairy herds from 1990 to 1998 (4-yr preapproval and 4-yr postapproval). With DHI records and Monsanto customer files, a control group (never purchased Posilac) and a bovine somatotropin (bST) group (used on at least 50% of cows) were identified. A total of 340 herds were involved and, over the 8-yr period, there were over 80,000 cows, 200,000 lactations, and 2 million test days. Herd management comparisons demonstrated the response to bST was relatively constant each year of the postapproval period. Assuming 100% of cows were supplemented, response to bST over a 305-d lactation equaled 894 kg of milk, 27 kg of milk fat, and 31 kg of milk protein. Comparisons of lactation curves were used to identify where the bST response occurred in the lactation cycle. Analysis demonstrated the responses in milk, milk fat, and protein yield were minimal in the early phase of lactation, and then gradually increased until reaching a plateau over the last half of the lactation cycle. Persistency of lactation was also improved by bST, indicating the opportunity exists to extend lactation with combined use of bST and altered reproductive management. Average age and days in milk did not differ between control and bST herds. Thus, stayability and herd-life of animals were not altered by bST treatment. Somatic cell count (SCC) linear scores were minimally affected in herds utilizing bST and the pattern of SCC over the lactation cycle was unaffected. Overall bST improved lactation yield and persistency consistently over the 4-yr postapproval period with no effects on cow stayability and herd-life.
Key Words: bovine somatotropin • milk • milk components • stayability
Submitted on February 22, 1999
Accepted on June 7, 1999
This article has been cited by other articles:
|
|
 |
|
  J. L. Capper, E. Castaneda-Gutierrez, R. A. Cady, and D. E. Bauman The environmental impact of recombinant bovine somatotropin (rbST) use in dairy production PNAS, July 15, 2008; 105(28): 9668 - 9673. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. Carriquiry, W. J. Weber, and B. A. Crooker Administration of Bovine Somatotropin in Early Lactation: A Meta-Analysis of Production Responses by Multiparous Holstein Cows J Dairy Sci, July 1, 2008; 91(7): 2641 - 2652. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
R. S. Settivari, J. N. Spain, M. R. Ellersieck, J. C. Byatt, R. J. Collier, and D. E. Spiers Relationship of Thermal Status to Productivity in Heat-Stressed Dairy Cows Given Recombinant Bovine Somatotropin J Dairy Sci, March 1, 2007; 90(3): 1265 - 1280. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
F. D. Jousan, L. A. de Castro e Paula, J. Block, and P. J. Hansen Fertility of Lactating Dairy Cows Administered Recombinant Bovine Somatotropin During Heat Stress J Dairy Sci, January 1, 2007; 90(1): 341 - 351. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. Al-Seaf, J. F. Keown, and L. D. Van Vleck Genetic Parameters for Yield Traits of Cows Treated or Not Treated with Bovine Somatotropin J Dairy Sci, January 1, 2007; 90(1): 501 - 506. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
T. R. Bilby, A. Sozzi, M. M. Lopez, F. T. Silvestre, A. D. Ealy, C. R. Staples, and W. W. Thatcher Pregnancy, Bovine Somatotropin, and Dietary n-3 Fatty Acids in Lactating Dairy Cows: I. Ovarian, Conceptus, and Growth Hormone-Insulin-Like Growth Factor System Responses. J Dairy Sci, September 1, 2006; 89(9): 3360 - 3374. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 D. L. Hadsell, D. T. Torres, N. A. Lawrence, J. George, A. F. Parlow, A. V. Lee, and M. L. Fiorotto Overexpression of Des(1-3) Insulin-Like Growth Factor 1 in the Mammary Glands of Transgenic Mice Delays the Loss of Milk Production with Prolonged Lactation Biol Reprod, December 1, 2005; 73(6): 1116 - 1125. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. S. Stevenson and A. P. Phatak Inseminations at Estrus Induced by Presynchronization Before Application of Synchronized Estrus and Ovulation J Dairy Sci, January 1, 2005; 88(1): 399 - 405. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. L. Magliaro, R. S. Kensinger, S. A. Ford, M. L. O'Connor, L. D. Muller, and R. Graboski Induced Lactation in Nonpregnant Cows: Profitability and Response to Bovine Somatotropin J Dairy Sci, October 1, 2004; 87(10): 3290 - 3297. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
E. L. Annen, R. J. Collier, M. A. McGuire, and J. L. Vicini Effects of Dry Period Length on Milk Yield and Mammary Epithelial Cells J Dairy Sci, July 1, 2004; 87(13_suppl): E66 - 76. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. E. P. Santos, S. O. Juchem, R. L. A. Cerri, K. N. Galvao, R. C. Chebel, W. W. Thatcher, C. S. Dei, and C. R. Bilby Effect of bST and Reproductive Management on Reproductive Performance of Holstein Dairy Cows J Dairy Sci, April 1, 2004; 87(4): 868 - 881. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Bormann, G. R. Wiggans, T. Druet, and N. Gengler Within-Herd Effects of Age at Test Day and Lactation Stage on Test-Day Yields J Dairy Sci, November 1, 2003; 86(11): 3765 - 3774. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 A. V. Capuco, S. E. Ellis, S. A. Hale, E. Long, R. A. Erdman, X. Zhao, and M. J. Paape Lactation persistency: Insights from mammary cell proliferation studies J Anim Sci, March 1, 2003; 81(suppl_3): 18 - 31. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 S. Blott, J.-J. Kim, S. Moisio, A. Schmidt-Kuntzel, A. Cornet, P. Berzi, N. Cambisano, C. Ford, B. Grisart, D. Johnson, et al. Molecular Dissection of a Quantitative Trait Locus: A Phenylalanine-to-Tyrosine Substitution in the Transmembrane Domain of the Bovine Growth Hormone Receptor Is Associated With a Major Effect on Milk Yield and Composition Genetics, January 1, 2003; 163(1): 253 - 266. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
