Abstract
In order to clarify the effects of various conditions for management (scale of grassland, scale of dairy cattle number, and labor power) on the utilization of grassland and the yield, a typical analysis was executed by use of the parametric linear programing method. The place for investigation object was Toyotomi Town under the administration of Soya Branch Office of Hokkaido. The method of analysis was to divide the stereotypes of management for a planning model into the types of employed labor power utilization, domestic labor power utilization and machine union utilization, to establish twelve stereotypes for grassland utilization, and to calculate the optimam grassland utilization on each grassland scale. Results obtained are as follows: 1) Supposing that the labor power and the condition for equipment of labor means are constant, the grassland utilization becomes rough by the enlargement of grassland area and the yield of pasture utilization per ha (Nutrient quantity) decreases. Furthermore, there s a limit of intensiveness by the labor power in the type of domestic labor power utilization. Accordingly, the yield of pasture utilization per ha is lower than that in the type of employed labor power utilization, and it is shown that the rate of decrease according to the scale of grassland is large. 2) Supposing that the grassland area and the condition for equipment of labor means are constant, the grassland utilization becomes intensive by the increase of labor power, and the yield of pasture utilization per ha indicates a trend of slight increase. 3) From the above-mentioned facts, by the enlargement of grassland area per person, the grassland utilization is transferred from the intensive grassland utilization to the extensive grassland utilization. Accordingly, supposing that the quantity of pasture supply (utilized fresh grass quantity) per dairy cattle is constant, the scale of dairy cattle breeding number decreases relatively by the enlargement of grassland area. 4) From these results, it was estimated that the largest grassland area in the case of two family labor powers with three stereotypes is 40.0ha of grassland area (dairy cattle: 65 head; agricultural income: 6,000,000yen) for the type of employed labor power utilization, 20.0ha (35 head; 3,400,000yen) for the type of domestic labor power utilization, and 30.0ha (45 head; 4,000,000yen) for the type of machine union utilization. This conclusion could be introduced from the presumption of a constant self-supply rate of feed and adoption of the present systematized techniques, and the examination on the change of self-supply rate and the discussion in the case of introducing the improved systematized techniques remain as future problems.
