Abstract
The experiments were undertaken to investigate the influence of growing seasons on nutritive value of orchardgrass, perennial ryegrass and timothy in Sorachi district. Forage and feces density were determined by MONTOGOMERY'S method to get relationships between digestibility and physical form. The results are summarized as follows: 1. Digestible organic matter and cell contents of aftermath in summer (summer grasses) were lower than those of first cutting grasses in spring (spring grasses) and of aftermath of last cutting of the year in autumn (autumn grasses). Cell walls, acid detergent fiiber, acid detergent lignin and silicic acid contents of summer grasses were higher than spring and autumn grasses. 2. Significant correlation was obtained between digestible dry matter (DDM) and digestible amount of cell walls on summer grasses, but little correlations between them on spring and autumn grasses. 3. Significant negative correlation was observed between the contents of cell walls in aftermath and its density, and same correlation was observed in feces. DDM of grasses had significant effect on feces density.
