Energy and Matter Flows in Bahiagrass Pasture : V. Excreting behavior of Holstein heifers

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  • バヒアグラス放牧草地におけるエネルギーと物質の流れ : V. 乳用育成牛群の排泄行動に関する2,3の観察
  • バヒアグラス放牧草地におけるエネルギーと物質の流れ-5-乳用育成牛群の排泄行動に関する2,3の観察
  • バヒアグラス ホウボク ソウチ ニ オケル エネルギー ト ブッシツ ノ ナガ

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Abstract

Some observations were made on the excreting behavior of Holstein heifers on bahiagrass (Paspalum notatum Flugge) pasture in relation to nutrient recycling, at Miyazaki Animal Industry Experiment Station, Takaharu, Miyazaki. A resting place (about 60m^2) with shading trees was provided in adjacent area to the bahiagrass pasture (1760m^2) to shelter the herd (21-24 heads) in hot days. The pasture was grazed eight times in 1983 and the numbers of defecations and urinations on the pasture and on the resting place were counted separetely through 24 hrs for 5th (26-29, JuD, 7th (23-25, Sep.) and 8th (26-28, Oct.) grazings. The results obtained are summarized as follows : 1) The air temperature in the 5th grazing exceeded 27℃ through almost all of the daytime, and that in the 7th grazing exceeded 27℃ for 5 hours (10 to 15 h). But, the air temperature in the 8th grazing did not exceed 23. 5℃ even at maximum. 2) The numbers of defecations (No./head/day) were 6.5, 8.3 and 7.7 for 5th, 7th and 8th grazings, respectively. The number of urinations (No./head/day) varied with seasons, showing 18.3, 16.8 and 10.7 for the 5th, 7th and 8th grazings, respectively. 3) Percentages of defecations on the pasture (number of defecations on the pasture/total number of defecations) in the 5th and 7th grazings were 74 and 71%, while that in the 8th grazing was 89%. 4) Percentages of urinations on the pasture were only about 50% in the 5th and 7th grazings, though 89% was recorded in the 8th grazing. 5) About 68-76% of defecations and 80% of urinations occurred in the daytime (from sunrise to sunset). 6) The results suggest that existence of a resting place tends to disturb the nutrient recycling by decreasing the excreta deposited on the pasture, especially during the periods of high air temperature in the daytime.

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