To find the mass of 95 cows, we multiply the average mass of one cow by the number of cows:
\[ \text{Total mass} = \text{Average mass per cow} \times \text{Number of cows} \]
Substituting the values we have:
\[ \text{Total mass} = 410 , \text{kg} \times 95 \]
Now we'll do the multiplication:
\[ 410 \times 95 = 38950 , \text{kg} \]
Next, we need to express 38950 in scientific notation. To do this, we can rewrite it as follows:
\[ 38950 = 3.895 \times 10^4 \]
Thus, the mass of 95 cows in scientific notation is:
\[ \boxed{3.895 \times 10^4} , \text{kg} \]