| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
1 Department of Dairy Science, University of Wisconsin, Madison 53706
2 Interbull Centre, Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, S-570 07 Uppsala, Sweden
The International Bull Evaluation Service Centre has routinely calculated international dairy sire evaluations since 1994. Production systems vary between countries and between herds within a country, and these differences can cause significant genotype x environment interactions.First-lactation records of Holstein cows calving from January 1, 1990 through December 31, 1997,were used in this study. Countries that provided data for this study included Australia, Austria, Belgium, Canada,Czech Republic, Estonia, Finland, Germany, Hungary,Ireland, Israel, Italy, The Netherlands, New Zealand, South Africa, Switzerland, and the United States. Country means were calculated for 13 variables related to climate, herd management, and genetic background.These variables were considered as possible causes of genotype by environment interaction. Highestpeak yields were found in Israel and the United States at 31.4 and 30.5 kg, respectively. New Zealand and Estonia had the lowest daily peak yields at 17.1 and 18.9 kg,respectively. This was consistent with genetic differences between these countries, because Israel had the highest average predicted transmitting abilities (PTA)milk among sires, while Estonia had the lowest PTAmilk. Persistency of lactation, defined as milk yield at 240 d postpartum divided by milk yield at 60 d postpartum,was highest in the Czech Republic and Estonia at 1.34, and lowest in Israel at 1.05. Herd size also varied substantially between countries, ranging from 2.3 first-lactation cows per herd-year in Finland to 62 per herd-year in Hungary. In summary, tremendous variation exists between the leading dairy countries in management,genetic, and climatic factors.
Key Words: international evaluation • genotype x environment interaction • production systems
Submitted on April 2, 2001
Accepted on July 11, 2001
This article has been cited by other articles:
|
|
 |
|
  H. Hammami, B. Rekik, H. Soyeurt, C. Bastin, J. Stoll, and N. Gengler Genotype x Environment Interaction for Milk Yield in Holsteins Using Luxembourg and Tunisian Populations J Dairy Sci, September 1, 2008; 91(9): 3661 - 3671. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
K. Togashi and C. Y. Lin Efficiency of Different Selection Criteria for Persistency and Lactation Milk Yield J Dairy Sci, May 1, 2004; 87(5): 1528 - 1535. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. P. L. Calus and R. F. Veerkamp Estimation of Environmental Sensitivity of Genetic Merit for Milk Production Traits Using a Random Regression Model J Dairy Sci, November 1, 2003; 86(11): 3756 - 3764. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
E. Raffrenato, R. W. Blake, P. A. Oltenacu, J. Carvalheira, and G. Licitra Genotype by Environment Interaction for Yield and Somatic Cell Score with Alternative Environmental Definitions J Dairy Sci, July 1, 2003; 86(7): 2470 - 2479. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
N. R. Zwald, K. A. Weigel, W. F. Fikse, and R. Rekaya Identification of Factors That Cause Genotype by Environment Interaction Between Herds of Holstein Cattle in Seventeen Countries J Dairy Sci, March 1, 2003; 86(3): 1009 - 1018. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
N. R. Zwald, K. A. Weigel, W. F. Fikse, and R. Rekaya Application of a Multiple-Trait Herd Cluster Model for Genetic Evaluation of Dairy Sires from Seventeen Countries J Dairy Sci, January 1, 2003; 86(1): 376 - 382. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Jamrozik, L. R. Schaeffer, and K. A. Weigel Estimates of Genetic Parameters for Single- and Multiple-Country Test-Day Models J Dairy Sci, November 1, 2002; 85(11): 3131 - 3141. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
