Prediction of feed intake in growing beef cattle fed tropical forages

Prediction of feed intake in growing beef cattle fed tropical forages Conference Paper

17th Australian Rangeland Society Biennial Conference

  • Author(s): Luciano A. González, Carlos Ramírez-Restrepo, David Coate, Ed Charmley
  • Published: 2012
  • Publisher: Australian Rangeland Society

Abstract: Prediction of feed intake in beef enterprises is important for feed budgeting, productivity, profitability and environmental outcomes (e.g. carbon and methane accounting). The objective of this study was to develop empirical prediction models for feed intake of growing beef cattle fed a range of tropical forages. Data were gathered from previous metabolism and pen trials (76 treatment diets) having live weight (LW), dry matter intake (DMI) and diet characteristics including in vivo DM digestibility (IVDMD), nitrogen (N), neutral (NDF) and acid (ADF) detergent fibre. Prediction equations of DMI were derived using mixed-effects linear regression models with LW and diet characteristic as independent variables and location of trial as a random factor. The models were later validated with an independent dataset from published literature related to tropical grazing trials. Results indicated that DMI could be predicted with similar accuracy using LW and any one measure of diet characteristic (R2 from 73 to 81%) with the highest R2 from the equation based on LW and ADF. However, validation against an independent dataset from grazing trials indicated that DMI was more accurately predicted from LW and IVDMD (R2 = 75%), LW and N (R2 = 71%), LW and NDF (R2 = 61%), and least with LW and ADF (R2 = 24%). The lower accuracy of the models to predict DMI from grazing trial may be due to diet selection and method used to measure it. The present models may be used with results from faecal NIRS as input to predict DMI more accurately.

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Luciano A. González, Carlos Ramírez-Restrepo, David Coate, Ed Charmley, 2012, Prediction of feed intake in growing beef cattle fed tropical forages, Conference Paper, viewed 15 August 2022, https://www.nintione.com.au/?p=3666.

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