Frequency of Defecation and Urination by Japanese Black Cattle in a Daytime Grazing System Utilizing a Bahiagrass (Paspalum notatum Flugge) Pasture

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  • HIRATA Masahiko
    Grassland and Animal Production Division, Faculty of Agriculture, Miyazaki University:(Present address)Division of Grassland Science, Faculty of Agriculture, Miyazaki University
  • HIGASHIYAMA Masakazu
    Grassland and Animal Production Division, Faculty of Agriculture, Miyazaki University:(Present address)Mountainous Region Branch, National Grassland Research Institute
  • FUKUYAMA Kiichi
    Grassland and Animal Production Division, Faculty of Agriculture, Miyazaki University:Sumiyoshi Livestock Farm, Faculty of Agriculture, Miyazaki University

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  • バヒアグラス (Paspalum notatum Flugge) 草地を利用した昼間放牧システムにおける黒毛和種牛の排糞・排尿頻度.

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Abstract

This study analyzed the frequency of defecation and urination by Japanese Black Cattle in a daytime grazing system utilizing a bahiagrass (Paspalum notatum Flugge) pasture to obtain some information about the factors influencing the frequency and examine the possibility of developing empirical, deterministic models for predicting the frequency. The number of defecations and urinations was respectively 8-22 and 2-16 times/head/d (mean=15.4 and 8.5) in individual animals, and 11.0-17.2 and 5.5-12.0 times/head/d (mean=15.1 and 8.2) for the herd. The defecation frequency for the herd was positively correlated with feed DM intake and fecal DM output. A broken-line function employing the intake or fecal output as a predictor explained 53-71% of the variation in the frequency. The urination frequency for the herd was positively correlated with feed DM intake, fecal output as FW and fecal water output. A straight-line function using these variables as a predictor explained 23-29% of the variation in the frequency. The correlation between the defecation and urination frequencies was low or non-significant. The frequency of defecation and urination may be empirically predicted with acceptable errors from some variables commonly dealt with in models of grazing systems.

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