The estimation of the intake of grazing sheep I. Establishment of faecal nitrogen regressions

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Abstract
1. Regression equations for the ratio of organic matter (O.M.) feed intake to O.M. faecal output on faecal N%, and the N% in the O.M. intake on faecal N% were established over a 52-week period by feeding caged Corriedale wethers on pasture cut from a Wimmera rye-grass (Lolium rigidum Gaud.), subterranean clover (Trifolium subterraneum) sward in a Mediterranean-type environment.2. The regression equations and their application to grazing sheep together with the relation between O.M. intake and faecal N, are discussed.