Evaluation of traits associated with bucking bull performance and behavior

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Title: Evaluation of traits associated with bucking bull performance and behavior
Author: Romero, Natasha Elizabeth
Abstract: Video and industry data were used to assess the inter -relationships of aggression , delivery , coat color , year of birth , number of outs , buckoff percent and score in rodeo bulls . An evaluation of laterality based on observations of how the individual animals were loaded into chutes at 11 bull riding events showed 63 % left -handed delivery and 37 % right -handed delivery across all observations (n = 525 ) . There was a similar distribution for aggressiveness (based on whether or not the bull charged after the rider dismounted ) with 64 % of bulls being non -aggressive and 36 % of bulls being aggressive . Significant linear relationships existed between score and number of outs and score and buckoff percentage indicating that experience impacted performance . The correlation between number of outs and buckoff percentage was low to moderate (0 .06 to 0 .30 ) , depending upon the subset of data evaluated . The r -square value for the analysis of score among all bulls was 0 .14 ; however , the r -square value in the subset of bulls with known sires with more than one son was 0 .68 when sire was included in the model . Similar increases in r -square values were observed for 2006 average score , career average score , buckoff percentage , and career buckoff percentage , indicating important genetic influences on these traits and /or their component traits . Investigations into the relationship between performance and aggression may help bucking stock producers improve the selection criteria they use . The current trend within the industry is for several breeders to breed ?hot ? or flighty , nervous cattle to achieve higher performing offspring . Given that there was no association between aggression and score based on chi -square test , aggression may be removed from the criteria for using certain animals for breeding purposes . Based on results from this work , if bucking stock breeders want to make genetic changes in these traits , documentation of pedigree information is vital .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -3097
Date: 2009-05-15

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Evaluation of traits associated with bucking bull performance and behavior. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -3097 .

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