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NE for Growing/Finishing Beef Cattle

Learn about the California Net Energy System and how it allows for accurate prediction of energy requirements for growing and finishing beef cattle. Understand the concepts of Net Energy for maintenance (NEm) and Net Energy for gain (NEg) and how they affect feed intake and energy utilization. Discover how to use NE values and feed intake to predict gain on a specific diet and determine the amount of feed required for a desired gain. Explore an example calculation using the NE System to estimate predicted average daily gain (ADG) and feed efficiency.

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NE for Growing/Finishing Beef Cattle

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  1. NE for Growing/Finishing Beef Cattle • California Net Energy System • Lofgreen & Garrett, 1968 • Net Energy for maintenance – NEm • Net Energy for gain – NEg • More useful than TDN • Allows more accurate prediction of energy

  2. NE for Growing/Finishing Beef Cattle • NEm – ability of feed to meet energy reqmt for maintenance • NEg – ability of feed to meet energy reqmt for gain • Maintenance energy must be met first • Then any additional energy can be used for gain

  3. NE for Growing/Finishing Beef Cattle • NE values of feeds + feed intake can be used to: • Predict gain on particular diet • Predict amount of feed required for particular gain (programmed feeding)

  4. NE for Growing/Finishing Beef Cattle • Two NE values for feeds • Feed energy is used more efficiently for maintenance than for gain • NEm values always higher than NEg

  5. Example – NE System • 715 lb yearling steers (1,300 lb finished) • From feed records, consuming 16 lb (7.26 kg) of diet which contains: • 2.09 Mcal/kg NEm • 1.42 Mcal/kg NEg

  6. Example – NE System • NEm required per day is based only on body weight (Table 9) = 5.89 Mcal/day

  7. Example – NE System Energy in feed requirement • 5.89 Mcal NEm/2.09 Mcal NEm/kg = 2.82 kg of diet needed for maintenance • Total intake is 7.26 kg • 7.26 kg – 2.82 kg = 4.44 kg remaining for gain • 4.44 kg x 1.42 Mcal/kg NEg = 6.30 Mcal available for gain Energy in feed

  8. Example – NE System • 6.30 Mcal available for gain • From Table 9 – need 6.94 Mcal to gain 3.99 lb/day

  9. Example – NE System • From Table 9 – need 6.94 Mcal to gain 3.99 lb/day • Extrapolate: • 3.99 lb/6.94 Mcal = x lb/6.30 Mcal • x = 3.62 lb/day Predicted ADG What we have available for gain

  10. Example – NE System • Feed efficiency • Expressed 2 ways: • lb feed/lb gain • 16 lb/3.62 lb = 4.4 or • lb gain/100 lb feed • 3.62 lb/0.16 lb = 22.6

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