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Predicting feed intake in confined beef cows.

Megan A Gross¹, Amanda L Holder², Alexi N Moehlenpah¹

¹Department of Animal and Food Sciences, Oklahoma State University, Stillwater, OK 74078, USA.

Translational Animal Science

|February 22, 2024

Summary

Existing beef cow feed intake prediction equations were evaluated using recent data. New models were developed, accounting for 68% of intake variation, offering improved accuracy for nonlactating and lactating beef cows.

Keywords:

beef cow dry matter intake prediction equations

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Area of Science:

Animal Science
Ruminant Nutrition
Beef Cattle Production

Background:

Accurate prediction of feed intake is crucial for efficient beef cow management.
Existing equations, such as those from NRC (1987, 1996), have limitations in predicting dry matter intake (DMI) in beef cows.
Previous models were developed using data predating 2002 and may not reflect current production systems.

Purpose of the Study:

To validate the accuracy of existing feed intake prediction equations using recent data (post-2002).
To develop and propose alternative, more accurate prediction models for beef cow feed intake.

Main Methods:

Evaluated six established feed intake prediction equations (NRC 1987, NRC 1996, Hibberd and Thrift 1992).
Compiled a dataset of 53 nonlactating and 32 lactating cow treatment means from studies published since 2002.
Developed new empirical models using regression analysis, incorporating shrunk body weight (SBW) and diet net energy for maintenance (NEm).

Main Results:

The NRC (1996) equation underestimated feed intake for nonlactating cows (average deviation 2.4 kg/d) and lactating cows (average deviation 3.0 kg/d).
Both nonlactating and lactating equations showed significant deviations in slope and intercept compared to observed data.
The best-fit empirical model developed in this study explained 68% of the variation in daily feed intake.

Conclusions:

Existing feed intake prediction equations require updating to accurately reflect current beef cow production.
The newly developed empirical models show promise for improved DMI prediction in beef cows.
Further validation of the proposed equations with independent datasets is recommended.