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Codified Morphological Stage for Predicting Digestibility of Italian Ryegrass during the Spring Cycle

Maria Eugenia Valentea, Giorgio Borreanib, Pier Giorgio Peirettia and Ernesto Tabaccob

a Centro di Studio per l'Alimentazione degli Animali in Produzione Zootecnica, CNR, Torino, Italy
b Dep. Agronomia, Selvicoltura e Gestione del Territorio, Univ. of Turin, via Leonardo da Vinci 44, 10095 Grugliasco, Turin, Italy. The work is attributable in equal part to the authors



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  		Fig. 1 Organic matter digestibility (OMD) in Italian ryegrass as a function of growing degree days

 


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  		Fig. 2 Organic matter digestibility (OMD) in Italian ryegrass as a function of age in days from 1 January

 


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  		Fig. 3 Organic matter digestibility (OMD) in Italian ryegrass as a function of codified stage

 


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  		Fig. 4 Organic matter digestibility (OMD) in Italian ryegrass cultivars as a function of (a) age in days, and (b) codified morphological stage of 2-yr data set (1994–1995),

 


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  		Fig. 5 Evaluation of the model to predict organic matter digestibility (OMD) from codified stage by regressing field observations on predictions

 




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