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Average daily gain: Difference between revisions
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[[Category:Growth Traits]] | |||
Average daily gain (ADG) is a measurement of the average daily body weight change of an animal over a specified period of time. Average daily gain is calculated as follows: | Average daily gain (ADG) is a measurement of the average daily body weight change of an animal over a specified period of time. Average daily gain is calculated as follows: | ||
ADG (average daily gain) | ADG (average daily gain) | ||
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Initial and final weight data can be obtained as combinations of weights from specific testing periods (such as from feed intake tests), or from combinations of [[Birth Weight|birth]], [[Weaning Weight|weaning]], [[Yearling Weight|yearling]], [[Mature Height and Weight |mature]], or [[Slaughter Weight |harvest]] weights. | Initial and final weight data can be obtained as combinations of weights from specific testing periods (such as from feed intake tests), or from combinations of [[Birth Weight|birth]], [[Weaning Weight|weaning]], [[Yearling Weight|yearling]], [[Mature Height and Weight |mature]], or [[Slaughter Weight |harvest]] weights. | ||
==Genetic evaluation== | |||
Several organizations publish [[Expected Progeny Difference| EPDs]] for average daily gain. In all cases in North America, this is the average daily gain prediction for the period from weaning to yearling. It is simply calculated as, | |||
<center> | |||
<math> | |||
ADG=\frac{Yearling\,Wt\,EPD-Weaning\,Wt\,EPD}{160 days} | |||
</math> | |||
</center> | |||
It is important to note that in many North American genetic evaluations, including those of private organizations, the [[Yearling Weight | yearling weight EPD]] is calculated from a multiple-trait analysis that includes models for weaning weight and post-weaning 160-day gain. While not published as post-weaning gain EPDs, the few organizations that publish ADG EPDs produce them using the post-weaning 160-day gain EPDs from this multiple-trait analysis. | |||
Latest revision as of 13:38, 13 April 2021
Average daily gain (ADG) is a measurement of the average daily body weight change of an animal over a specified period of time. Average daily gain is calculated as follows: ADG (average daily gain) = (Final weight – Initial weight) / Days on test
It can also be expressed as a ratio as follows: ADGR (average daily gain ratio) = (ADG / Breed-test group average ADG) x 100
Initial and final weight data can be obtained as combinations of weights from specific testing periods (such as from feed intake tests), or from combinations of birth, weaning, yearling, mature, or harvest weights.
Genetic evaluation
Several organizations publish EPDs for average daily gain. In all cases in North America, this is the average daily gain prediction for the period from weaning to yearling. It is simply calculated as,
It is important to note that in many North American genetic evaluations, including those of private organizations, the yearling weight EPD is calculated from a multiple-trait analysis that includes models for weaning weight and post-weaning 160-day gain. While not published as post-weaning gain EPDs, the few organizations that publish ADG EPDs produce them using the post-weaning 160-day gain EPDs from this multiple-trait analysis.
