EFFECTS OF YEARLING WEIGHT SELECTION IN SHORTHORN BEEF CATTLE ON AGE-OF-DAM ADJUSTMENT FACTORS | Zendy

John Olthoff | Zendy; G. H. Crow | Zendy; G. W. RAHNEFELD | Zendy

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EFFECTS OF YEARLING WEIGHT SELECTION IN SHORTHORN BEEF CATTLE ON AGE-OF-DAM ADJUSTMENT FACTORS

Author(s) -

John Olthoff,

G. H. Crow,

G. W. RAHNEFELD

Publication year - 1990

Publication title -

canadian journal of animal science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.377

H-Index - 64

eISSN - 1918-1825

pISSN - 0008-3984

DOI - 10.4141/cjas90-116

Subject(s) - breed , beef cattle , shorthorn , zoology , biology , selection (genetic algorithm) , control line , weaning , birth weight , body weight , endocrinology , genetics , pregnancy , transmission line , artificial intelligence , computer science , electrical engineering , engineering

Lines within a breed which differ in their level of performance may require different age-of-dam adjustment factors in the same way that different breeds do. Age-of-dam adjustments calculated from a control and a yearling weight selection line indicated lower values in the selected line for calf birth weight, weaning weight and yearling weight for 2- and 4-yr-old dams. Trends for adjustment factors in each line over time were generally not significant but tended to diverge. Age-of-dam adjustment factors within a breed may need to be reevaluated at intervals as levels of performance change. Key words: Beef cattle, age of dam adjustment, selection, yearling weight

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