U.S. flagAn official website of the United States government
                    Here's how you know **Official websites use .gov**
                            
                            A **.gov** website belongs to an official government organization in the United States.
 **Secure .gov websites use HTTPS**
                            
                            A **lock** (                            
                              A locked padlock                                                      
                            
                            ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Menu Agricultural Research Service
						
                    U.S. DEPARTMENT OF AGRICULTURE
 close



Research
                Research Home
                            National Programs
                            Research Projects
                            Scientific Manuscripts
                            International Engagement
                            Scientific Software/Models
                            Databases and Datasets
                            Office of Scientific Quality Review
            Media
                News & Features
                            Multimedia
                            Briefing Room
                            Down on the Farm
                            Press Room
                            Science in Your Shopping Cart
                            Scientific Discoveries
                            Tellus
                            Under the Microscope
            About ARS
                About ARS Home
                            Staff Directory
                            Labs and Research Centers (Map)
                            Headquarter Offices
                            Organizational Chart
                            Employee Services (REE Employees Only)
                            Office of Outreach, Diversity, and Equal Opportunity
            Work With Us
                Work With Us Home
                            ARS Vacancies at USAJOBS
                            Careers at ARS Information
                            Scientific Collaborations
                            Extramural Agreements
                            1890 Faculty Research Sabbatical ProgramSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Research Publications at this Location





- ARS National Programs
- Search for a scientific manuscript
- Search for a research project
- ARS Software
- Programs and Projects
- Collaborations
- Subjects of Investigation
- Publications

Title:   Author  item
                                            Vanraden, Paulitem
                                            Powell, Rex
  Submitted to: Interbull Annual Meeting Proceedings
                                    Publication Type: Proceedings
                                    Publication Acceptance Date: 5/26/2002
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary: Longevity is an indicator of overall health of the cow and overall satisfaction of the owner, but the trait is defined and analyzed differently among countries. Some simple changes in the measure of daughter contribution and heritability could improve accuracy of proposed international evaluations for longevity. Longevity evaluations from 11 countries (Canada, Denmark, France, Germany, Israel, Italy, New Zealand, Sweden, Switzerland, The Netherlands, and the United States) were examined, and relationships with other traits on each country's scale were documented. Relationships of longevity with somatic cell score (mastitis resistance) and with conformation traits were fairly uniform across countries. Relationships of longevity with yield traits varied. More uniform trait and parameter definitions could increase relationships among and value of potential international longevity evaluations. Improved definitions of daughter contribution and heritability were suggested for different types of statistical analysis currently in use. A goal is that national and international reliability (accuracy) reflect true reliability for all evaluations. Further research on national and international evaluations should have high priority because most national economic indexes assign high value to longevity.
                                Technical Abstract: Longevity is an indicator of overall health of the cow and overall satisfaction of the owner, but the trait is defined and analyzed differently among countries. Longevity evaluations from 11 countries (Canada, Denmark, France, Germany, Israel, Italy, New Zealand, Sweden, Switzerland, The Netherlands, and the United States) were examined, and correlations with other traits on each country's scale were obtained. Correlations of longevity with somatic cell score and conformation traits were fairly uniform across countries. Correlations with yield traits varied for countries that reported functional longevity and for those that reported true longevity. Some correlations of yield with functional longevity were higher than correlations of yield with true longevity. More uniform trait and parameter definitions could increase correlations among and value of potential international longevity evaluations. Improved definitions of effective daughter contribution and heritability were suggested for different types of statistical analysis currently in use. Estimates of genetic correlations and standard deviations may be sensitive to incorrect values because fewer bulls have evaluations with high reliability. A goal is that national and international reliability reflect true reliability for all evaluations. Further research on national and international evaluations should have high priority because most national indexes assign high economic value to longevity.


Return to top


Connect with ARS Sign up


ARS Home
                            USDA.gov
                            Plain Writing
                            Policies & Links
                            Civil Rights Statements
                            FOIA
                            Accessibility Statement
                            Privacy Policy
                            Non-Discrimination Statement
                            Quality of Information
                            USA.gov
                            WhiteHouse.gov