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Articles by R.A Zinn
Total Records ( 1 ) for R.A Zinn
  N.Torrentera and R.A Zinn
  The objective of this study was to evaluate commercial feedlot growth performance factors that contribute to the variation in DP of bulls and heifers. Feedlot growth-performance data involving 878 pens of bulls and 784 pens of heifers were used to develop models for predicting Dressing Percentage (DP, 100* hot carcass weight/ final slaughter weight). Dressing percentage was similar for bulls and heifers, averaging 61.7?0.9%. Final Slaughter Weight (FSW, kg) explained 92% of the variation in Empty Body Weight (EBW, kg=15.941+0.877FSW; r =0.921) and 89% of the variation in hot carcass weight (HCW, kg=27.827+0.554FSW; r = 0.893). However, FSW, alone, explained much less (r = 0.10) of the variation in DP. Digestive tract fill averaged 11.4% with a range of 7.8 to 15.6%. Dressing percentage of bulls and heifers was inversely associated with DMI (DP = 68.061 -.874 DMI, kg; r = 0.32). Initial weight of cattle when entering the feedlot (IW, kg) was a better single predictor of DP than DMI, explaining 46% of the variation. However, IW was also a good predictor of DMI (r = 0.66): DMI = 4.6346 +.01422 IW. Based on stepwise regression analysis, factors that best described variation in DP were IW, FSW and DMI: DP =62.277-0.0131 IW+ 0.00920 FSW-0.212 DMI (r = 0.49). However, because of the close association between IW and DMI (lack 2 of independence), the contribution of DMI to the prediction was small. Removing DMI from the equation, the model becomes: DP = 61.857-0.148 IW + 0.00759 FSW (r = 0.48). We conclude that the effect of gender on DP 2 is small and nonappreciable. Initial weight and FSW are useful linear predictors of DP, explaining 48% of the variation. Dressing percentage decreases with increasing IW. For a given IW, DP increases with increasing FSW.
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