Trends in calving ages and calving intervals for dairy cattle breeds in the United States

Journal of Dairy Science

Volumn 89, Issue 1, 2006, Pages 365-370

  Hare, E ^a,b   Norman, H D ^a   Wright, J R ^a  

^a AGRICULTURAL RESEARCH SERVICE   (United States)

^b NONE   (United States)

Author keywords

Breed; Calving age; Calving interval; Parity

Indexed keywords

BOS TAURUS;

EID: 30844473084     PISSN: 00220302     EISSN: None     Source Type: Journal    
DOI: 10.3168/jds.S0022-0302(06)72102-6     Document Type: Article

References (13)

1. Animal Improvement Programs Laboratory. 2005. Genetic and phenotypic trends. Online. Available: http://aipl.arsusda.gov/dynamic/trend/current/trndx. html Accessed Apr. 20, 2005.
2. González-Recio, O., M. A. Pérez-Cabal, and R. Alenda. 2004. Economic value of female fertility and its relationship with profit in Spanish dairy cattle. J. Dairy Sci. 87:3053-3061.
3. Gröhn, Y. T., and P. J. Rajala-Schultz. 2000. Epidemiology of reproductive performance in dairy cows. Anim. Reprod. Sci. 60-61:605-614.
4. Lucy, M. C. 2001. Reproductive loss in high-producing dairy cattle: Where will it end? J. Dairy Sci. 84:1277-1293.
5. Murray, B. 2003. Balancing act - Research shows we are sacrificing fertility for production traits. Publ. 81-093. Ontario Ministry Agric. Food, Toronto, Canada.
6. Nederlands Rundvee Syndicaat. 2005. Jaarstatistieken 2004. Coöperatie Rundveeverbetering Delta, Arnhem, The Netherlands.
7. Nieuwhof, G. J., H. D. Norman, and F. N. Dickinson. 1989a. Phenotypic trends in herdlife of dairy cows in the United States. J. Dairy Sci. 72:726-736.
8. Nieuwhof, G. J., R. L. Powell, and H. D. Norman. 1989b. Ages at calving and calving interval for dairy cattle in the United States. J. Dairy Sci. 72:685-692.
9. USDA. 2002a. Dairy 2002. Part I: Reference of dairy health and management in the United States, 2002. Rep. N377.1202. National Animal Health Monitoring System, Animal and Plant Health Inspection Service, USDA, Fort Collins, CO.
10. USDA. 2002b. Dairy 2002. Part II: Changes in the United States dairy industry, 1991-2002. Rep. N399.0603. National Animal Health Monitoring System, Animal and Plant Health Inspection Service, USDA, Fort Collins, CO.
11. VanRaden, P. M., and E. J. H. Klaaskate. 1993. Genetic evaluation of length of productive life including predicted longevity of live cows. J. Dairy Sci. 76:2758-2764.
12. VanRaden, P. M., A. H. Sanders, M. E. Tooker, R. H. Miller, H. D. Norman, M. T. Kuhn, and G. R. Wiggans. 2004. Development of a national genetic evaluation for cow fertility. J. Dairy Sci. 87:2285-2292.
13. Wall, E., S. Brotherstone, J. A. Woolliams, G. Banos, and M. P. Coffey. 2003. Genetic evaluation of fertility using direct and correlated traits. J. Dairy Sci. 86:4093-4102.