In geography and fluvial geomorphology, a thalweg or talweg (/ËtÉËlvÉÉ¡/) is the line of lowest elevation within a valley or watercourse. Under international law, thalwegs can acquire special significance because disputed river borders are often deemed to run along the river's thalweg. 1 Etymology.
However, when they are 3 to 4 months old, they become susceptible to the disease, so all calves should be vaccinated for blackleg by 4 months of age. A revaccination 3 to 6 weeks later according to product label directions is necessary to provide the best protec-tion.lackleg seldom affects cattle older than 2 years of age, most likely due to immunity induced by vaccines or natural exposure. However, sporadic cases do occur in cattle older than 2 years and are often associated with the reuse of needles for multiple injections.
(http://www.wddty.com) A vaccine for meningitis B is not going to be added to the 26 vaccinations that a UK child will receive within the first 13 months of life.The UK's vaccine regulators do not believe there is enough evidence to suggest that the Bexsero vaccine is effective.weet. Follow @HealthRanger. (http://www.wddty.com) A vaccine for meningitis B is not going to be added to the 26 vaccinations that a UK child will receive within the first 13 months of life. The UK's vaccine regulators do not believe there is enough evidence to suggest that the Bexsero vaccine is effective.