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.
This provides for the transfer of antibodies in the colostrum to the kids. Kids from immunized does, who received a CD&T booster 3 to 6 weeks before kidding, should get their first CD&T vaccination at 10 to 12 weeks of age, with a booster 3-4 weeks later and a second booster 3-4 weeks after that.he C and D component vaccinates goats against a disease called enterotoxemia, caused by the bacteria Clostridium perfringens type C or D. Goats are very susceptible to this disease, whereas sheep, once vaccinated, are more resistant. The T is to vaccinate against tetanus, caused by the bacteria Clostridium tetani.