tailieunhanh - Báo cáo khoa học: "Morphology of the Leather Defect Light Flecks and Spots"

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: Morphology of the Leather Defect Light Flecks and Spots. | Acta vet. scand. 2001 42 107-112. Morphology of the Leather Defect Light Flecks and Spots By O. Nafstad1 H. Wisloff2 and H. Gr0nst0l1 department of Large Animal Clinical Sciences Norwegian School of Veterinary Science 8146 Dep 0033 Oslo Norway. 2National Veterinary Institute 8156 Dep 0033 Oslo Norway. Nafstad O Wisloff H Gronstol H Morphology of the leather defect light flecks and spots. Acta vet. scand. 2001 42 107-112. - The skin histology and the scanning electron microscope morphology of the hide defect light flecks and spots after tanning were studied in 11 steers infested with biting lice Damalinia bovis . Nine steers from herds free of lice were used as controls. Skin biopsies from 6 of the animals in the lice infested group showed mild to moderate hyperkeratosis and moderate perivascular to diffuse dermatitis with infiltration of mainly mononuclear cells and some eosinophilic granulocytes. The steers were slaughtered at an age of18 to 23 months. Light flecks and spots occurred on all examined hides from the infested group after tanning. No examined hides from the control group demonstrated similar damage. Both light microscopic examination of sections of tanned hide with light flecks and spots and scanning electron microscopy of the same defects showed superficial grain loss and craters with a irregular fibre base encircled by smooth and intact grain. The association between louse infestation at an early age and damage of hides following slaughter 6 to 15 months later suggested that louse infestations lead to a prolonged or lifelong weakening in the dermis. This weakening may cause superficial grain loss during the tanning process. leather light flecks and spots biting lice morphology. Introduction The leather defect light flecks and spots is defined as areas of grain loss up to 3 mm in diameter. This damage is closely associated with lice Webster Bugby 1990 Bugby et al. 1990 Nafstad Gr0nst0l 2001a Nafstad Gr0nst0l 2001b . Other authors have

TÀI LIỆU LIÊN QUAN
TỪ KHÓA LIÊN QUAN
crossorigin="anonymous">
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.