Now showing items 1-11 of 11

    • The All-Breed Animal Model 

      Cassell, Bennet G. (Virginia Cooperative Extension, 2009-05-01)
      The all-breed animal model is the genetic-evaluation system used to evaluate dairy animals in the United States.
    • Dairy Guidelines. Dairy Crossbreeding: Why and How 

      Cassell, Bennet G.; McAllister, Jack (Virginia Cooperative Extension, 2009-05-01)
      The primary genetic interest in crossbreeding is in whether animals with genes from different parent breeds perform better in combination than the average of their parent breeds.
    • Inbreeding 

      Cassell, Bennet G. (Virginia Cooperative Extension, 2009-05-01)
      Increased relationships are a natural consequence of using only a few sires in an AI breeding program. Inbreeding can be avoided, but not without sacrifice of progress toward improved productivity.
    • The Merit Indexes -- 2006 Version 

      Cassell, Bennet G. (Virginia Cooperative Extension, 2009-05-01)
      The Merit indexes are dairy sire selection tools published by USDA that combine genetic evaluations for production, health, fitness, and fertility traits. The indexes are designed to improve the lifetime economic performance ...
    • PTA's for cows : calculation and use 

      Cassell, Bennet G. (Virginia Cooperative Extension, 1994)
      Discusses female PTAs, factors affecting PTAs for individual cows, and how to use the estimates for within herd management.
    • Sire Evaluations for Health and Fitness Traits 

      Cassell, Bennet G. (Virginia Cooperative Extension, 2009-05-01)
      Documents genetic evaluation systems for specific traits, and also explains strategies to make economically sound genetic improvements in production, type, and fitness traits through use of a selection index to locate ...
    • The animal model 

      Cassell, Bennet G. (Virginia Cooperative Extension, 1992)
      The animal model is a system for genetic evaluations that estimates breeding values of bulls and cows at the same time.
    • Using heritability for genetic improvement 

      Cassell, Bennet G. (Virginia Cooperative Extension, 2001)
      This guideline highlights definitions and uses of heritability and lists estimates of heritability for several traits in dairy cattle breeding.
    • Using Heritability for Genetic Improvement 

      Cassell, Bennet G. (Virginia Cooperative Extension, 2009-05-01)
      This guideline highlights definitions and uses of heritability and lists estimates of heritability for several important traits in dairy cattle breeding.
    • Using sire evaluations to reduce calving difficulty 

      Cassell, Bennet G. (Virginia Cooperative Extension, 1992)
      Examines the role of the sire in calving difficulty and presents recommendations for choosing sires.
    • Young sires for herd improvement 

      Cassell, Bennet G. (Virginia Cooperative Extension, 1996)
      Discusses the choice between AI proven bulls and AI young sires, and which group offers the best opportunity for genetic progress.