tailieunhanh - Báo cáo khoa học: "Variation in the Level of Grain Defect Light Flecks and Spots on Cattle Hides"

Tuyển tập các báo cáo nghiên cứu về bệnh thú y được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành thú y đề tài: Variation in the Level of Grain Defect Light Flecks and Spots on Cattle Hides. | Acta vet. scand. 2001 42 91-98. Variation in the Level of Grain Defect Light Flecks and Spots on Cattle Hides By O. Nafstad and H. Gr0nst0l Department of Large Animal Clinical Sciences Norwegian School of Veterinary Science Oslo Norway. Nafstad O Gronstol H Variation in the level of grain defect light flecks and spots on cattle hides. Acta vet. scand. 2001 42 91-98. - The occurrence of hide damage light flecks and spots was determined on tanned hides from 28 herds during a period of 8 to 12 months. Light flecks and spots are described as small areas of grain loss up to 3 mm in diameter that are seen on dyed crust cattle leather. Damage was found on of all hides. The neck and shoulders were the anatomical region with the highest prevalence of damage. Sixty-eight per cent of all hides had light flecks and spots in this region. The forelimbs and dewlap were the anatomical region with the second highest occurrence with a prevalence of . This distribution corresponded to the known distribution of lice in cattle. No significant differences were observed in age sex prevalence of lice in the herd assessed in March or infestations with different lice species. The frequency of light flecks and spots varied significantly during the year. The frequency was highest in the late winter and early spring decreased significantly during the summer and was lowest in the autumn. This variation supported the importance of lice in the development of light flecks and spots and suggested a relatively long healing period for the damages induced by lice. leather damage lice. Introduction Several ectoparasites can be responsible for damage of cattle hides Tancouse 1986 . Some of the damage is very specific such as grub damage caused by warble fly larvae but most ectoparasite damage is more nonspecific. In recent years light flecks and spots have been considered the main damage caused by ectoparasites. Webster Bugby 1990 found a significant association between both biting lice .

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