tailieunhanh - Báo cáo khoa học: "The Effect of Eradication of Lice on the Occurrence of the Grain Defect Light Flecks and Spots on Cattle Hide"

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: The Effect of Eradication of Lice on the Occurrence of the Grain Defect Light Flecks and Spots on Cattle Hides. | Acta vet. scand. 2001 42 99-106. The Effect of Eradication of Lice on the Occurrence of the 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 The effect of eradication of lice on the occurrence of the grain defect light flecks and spots on cattle hides. Acta vet. scand. 2001 42 99-106. - The influence of an eradication programme for lice on the prevalence of light flecks and spots on cattle hides was studied in 33 dairy cattle herds during a period of two and a half years. Lice were eradicated from the main group of herds after 9 to 12 months and the quality of the hides before and after treatment was compared. Hides from slaughtered animals were collected during the study period tanned and examined with special emphasis on the occurrence of the grain damage light flecks and spots. The prevalence of hides without light flecks and spots increased from before treatment to after treatment. The prevalence of hides free from the damage increased significantly in all examined anatomical regions. The improvement in hide quality was most marked in the shoulders and neck region which corresponded to the major predilection site of cattle lice. The prevalence of hides with light flecks and spots started to decrease in the first period 2-40 days after eradication. The changes after treatment suggested that most healing process took place over a period of about 4 months. The eradication programme eliminated the seasonal variation in the prevalence of light flecks and spots which was present before treatment. cattle hide leather damage light flecks and spots eradication. Introduction Light flecks and spots were described and precisely defined for the first time by Webster Bugby 1990 . These investigators defined light flecks and spots as small areas of grain loss up to 3 mm in diameter that are seen on dyed crust bovine .

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