Analysis of a Japanese Black Cattle Rearing System Utilizing a Bahiagrass (Paspalum notatum Flugge) Pasture : 1. Variations in the factors considered to affect animal production

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  • HIGASHIYAMA Masakazu
    Grassland and Animal Production Division, Faculty of Agriculture, Miyazaki University
  • HIRATA Masahiko
    Grassland and Animal Production Division, Faculty of Agriculture, Miyazaki University

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  • バヒアグラス (Paspalum notatum Flugge)放牧草地を利用した黒毛和種育成牛飼養システムの解析 : 1. 家畜生産に影響を及ぼすと考えられる要因の変動
  • Analysis of a Japanese Black Cattle Rea

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Abstract

In a Japanese Black Cattle rearing system utilizing a bahiagrass pasture in coastal Miyazaki, various factors considered to affect animal production were measured for 3 years, and their variations with the year, season and progressive grazing were examined. The air temperatures increased from May to July / August, and decreased from August/September to October. The solar radiation and rainfall showed different seasonal variations with the years. The intake of supplementary feed varied almost similarly to the level of supplementary feeding. The sward height and herbage mass tended to increase from May to July/August and decrease thereafter, except for some sudden drops by the mowings. As a paddock was progressively grazed, the sward height and herbage mass sometimes increased, though they mostly decreased. The sward bulk density showed different seasonal variations with the years. The dry matter digestibility of bahiagrass leaves and pasture decreased from May to August and leveled off thereafter. The animal liveweight, except for some drops with changes in herd composition, always increased. The herbage allowance, except for the first year, showed similar seasonal variations to the herbage mass. The percentage grazing time showed different seasonal variations with the years. The biting rate and the number of bites tended to decrease from May to July / August and increase thereafter. The dry matter digestibility of hand-plucked herbage showed similar seasonal variations to the pasture digestibility. For clarifying the mechanisms of such factor variabilities and characterizing the system, an analysis of the relationships between the factors was considered to be important.

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