褐毛和種繁殖資源拡大に関する研究 : 繁殖農家意思決定の視点より

Japanese Brown Cattle are facing with a crisis of survival mainly due to Beef Liberalization. However, the calf price tends to raise, recently. Breeding farmer must make a effort for increase in cow numbers. It is necessary for the farm to keep steady income and leave good female calf in the farm. The purpose of this paper is to determine calf market price factors of Japanese Brown Cattle and effect of different reproduction roots on calf characteristics formation. Multi-variate analysis are used to analyze it on the viewpoint of Breeding farmer's decision making. Obtained results are shown as below. 1) Weight, age of birth in the market, and mother's point are significant factors for the price formation. And also, mother and father's registration level influence the price formation pattern. Usually, it is said that calf price level produced in pasteurizing is low, compared to that in housing. But, the result shows there is no difference between them. In addition, pasteurizing are able to reduce production cost to 38% of that in housing. Therefore, pasteurizing is better system than housing for calf production. 2) Mother registration level is an important factor rather than father's to produce her children. But father's registration level influences formation of grand child's characteristics. 3) Optimal term about Japanese Brown Calf which should be supplyed to market is shorter than Japanese Black Calf. It is about nine months in the case of female, eight months in male and early supply of calf, whose father or mother belongs to low level registration, compared to calf that in a higher registration, In order to make Japanese Brown Cattle survive, it is important for farmers to make a detailed supply planing in short term and to keep female calf whose father is registered at higher level in long term.