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A survey was conducted to determine the faunal composition and seasonal fluctuation of the population size of cattle ticks (Ixodides) and stomoxyine, tabanid and simulid flies which attack forest grazing cattle. Two or three Japanese Black cows were grazed on about 3 ha Japanese chestnut oak (<I>Quercus acutissima</I> Carruth) woodland (alt. 1, 000m) located in Morotsuka, Miyazaki Prefecture during May to November of 1997 and 1998.<BR>All the ticks were collected by dragging a flannel cloth (0.7×1m) over a pasture and the ticks were identified as unfed larvae of <I>Haemaphysalis longicornis</I>, most of which were found outside the grazed woodland in October, 1997. A few adult ticks of <I>Haemaphysalis longicornis</I> and <I>Ixodes ovatus</I> were also collected from the cows. Unfed larvae of <I>Haemaphysalis longicornis</I> were mainly collected in the ground vegetation of grazed woodland in 1998, and the number of engorged adult <I>Ixodes ovatus</I> was significantly larger in May than in other months (P<0.05) . Each year the population of Ixodides showed a tendency to increase. Stomoxyine flies consisted of <I>Haematobia irritans</I> and <I>Stomoxys calcitrans</I> showing a population peak in August, when <I>Haematobia irritans</I> was more dominant than <I>Stomoxys calcitrans</I>. A few tabanid flies consisted of the predominant species, <I>Tabanus chrysurus</I> and <I>T. humilis</I>, which were found throughout the grazing period with a peak in July, indicating that the peak was associated with air temperature (over 20°C) . The largest population in May was the <I>Simulium takahasii</I>, the predominant species of simulid flies (P <0.05) . Tabanid and simulid flies were observed widely over the grazing period compared to stomoxyine flies, which revealed biting and sucking forms. The serum total protein content, white blood cells, red blood cells (RBC) and Hematocrit in the cows were almost within the range of normal values, moreover there was no RBC infected with <I>Theileria sergenti</I>.<BR>In conclusion, the forest grazing cows had little hematological problems. The number of Ixodides was increased with grazing and the cows were attacked by pestfly, suggesting that nothing was wrong with the grazed woodland of this study for animal production.
- 日本暖地畜産学会の論文
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