Từ điển thú y vần L | L-Carnitine A vitamin of the B complex present in meat extracts and needed for fat oxidation. In human medicine it is claimed to improve exercise tolerance and so might have a potential use in racehorses. L-Forms of Bacteria Those which can survive without a true cell wall. L-forms of staphylococci and streptococci have been recovered from cases of mastitis. They are completely resistant to antibiotics such as penicillin which interfere with bacterial cell-wall formation. Labial Relating to the lips. Labile Unstable. Thermo-labile unstable in the presence of heat. Labium Labium is the Latin word for lip or lip-shaped organ. Laboratory Animals Animals bred specifically for scientific purposes it is illegal to use non-purpose-bred animals for scientific research. Their welfare and the conditions in which they are kept are strictly controlled by the Animals Scientific Procedures Act 1986 as amended 1998 by far the largest number of such animals are mice and rats. Laboratory Tests Laboratory tests are widely used as an aid to diagnosis but should always be interpreted in the light of the signs presented by the animal. Many tests involve examination of samples of the blood or its cells haematology or plasma or serum. Other tests are based on urine pus peritoneal or pleural fluid. Occasionally samples of tissues are taken for examination biopsy . Tests may be used to determine the various biochemical constituents of the sample or to detect the presence of bacteria viruses fungi mycoplasma or parasites. Samples usually serum may be used to detect the presence of antibodies to various infective agents. In cattle milk is increasingly used both to determine biological levels and to determine the herd exposure levels to infections such as bovine viral diarrhoea BVD and enzootic bovine leukosis EBL . Milk samples may also be used to determine the levels of bacteria present in the herd. Labour see PARTURITION Labrador Retriever A popular medium-sized breed of dog with black .
