Author:
Duynisveld J. L.,Charmley E.
Abstract
Data from 372 bulls on performance testing were used to compare predictions of intake and gain with observed performance when the forage-to-concentrate ratio (F:C) in the ration ranged from 57:43 to 45:55. Predictions were derived from the National Research Council (NRC 1996) and the Agricultural and Food Research Council (AFRC 1993) models. Increasing the F:C resulted in a decline in dry matter intake as a percent of body weight, but did not influence observed average daily gain (ADG). The NRC (1996) model increasingly under-predicted ADG as forage inclusion in the ration increased, whereas AFRC (1993) was a better predictor of daily gain as F:C increased. Contrary to predictions, inclusion levels of silage can be increased in totally mixed rations without compromising animal performance. Key words: Forage-to-concentrate ratio, bulls, performance, model
Publisher
Canadian Science Publishing
Subject
Animal Science and Zoology,Food Animals
Cited by
2 articles.
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