Đang chuẩn bị liên kết để tải về tài liệu:
Báo cáo khoa học: "Differences in the serum immunoglobulin concentrations between dairy and beef calves from birth to 14 days of age"

Tuyển tập các báo cáo nghiên cứu khoa học quốc tế về bệnh thú y đề tài: Differences in the serum immunoglobulin concentrations between dairy and beef calves from birth to 14 days of age | J. Vet. Sci. 2003 4 3 257-260 JOURNAL OF Veterinary Science Differences in the serum immunoglobulin concentrations between dairy and beef calves from birth to 14 days of age Guk-Hyun Suh Tai-Young Hur Dong-Soo Son Chang-yong Choe Young-Hun Jung Byeong-suk Ahn Chai-Yong Lee1 and Chung-Gil Lee1 National Livestock Research Institute RDA Cheonan 330-800 Korea College of Veterinary Medicine Chonnam National University Kwangju 500-757 Korea The changes in serum levels of immunoglobulins G M and A of dairy and beef calves of well-managed herds were monitored from birth to 14 days post partum using single radial immunodiffusion. Serum levels of all three immunoglobulin classes reached its peak at 24 hours in both groups of calves after birth at which time there were very high levels of each immunoglobulin present. The mean IgM and IgA levels of the two groups became same at 6 days and 8 days of age respectively but the mean IgG level of beef calves was approximately twice that of dairy calves throughout the experiment. Key words beef calf dairy calf serum immunoglobulins Introduction During the first two weeks of life calves are at highest risk for death and especially during the first week. Septicemic and enteric diseases are most common in this period. The failure of passive transfer of colostral immunoglobulins Ig is a major determinant of septicemic disease during this period 7 15 . It also modulates the occurrence of mortality and severity of enteric and respiratory diseases in early life of calves 18 . The major Ig in colostrum is IgG but there are also significant amounts of IgM and IgA 4 . Following ingestion by the newborn calves a significant proportion of these Igs ingested in the colostrum is absorbed across the epithelial cells of the small intestine during the first few hours of life and transported via the lymphatic system to the blood 3 . Igs in the blood are further varyingly distributed to extravascular fluids and to body secretions depending upon its .