To find out how many bottles of milk the cows produced on Friday, we need to calculate \( \frac{4}{5} \) of the amount produced on Thursday.
On Thursday, the cows produced 94 bottles of milk. We can calculate the amount for Friday as follows:
\[ \text{Amount produced on Friday} = \frac{4}{5} \times 94 \]
To perform this multiplication, we can first calculate:
\[ \frac{4 \times 94}{5} \]
Calculating \( 4 \times 94 \):
\[ 4 \times 94 = 376 \]
Now, we divide this by 5:
\[ \frac{376}{5} = 75.2 \]
Since 75.2 is a decimal, we can convert it to a mixed number. The whole number part is 75 and the fractional part is:
\[ 0.2 = \frac{2}{10} = \frac{1}{5} \]
Thus, \( 75.2 \) as a mixed number is:
\[ 75 \frac{1}{5} \]
Therefore, the cows produced \( 75.2 \) or as a fraction, \( \frac{376}{5} \) bottles of milk on Friday.
The answer, in the form of a whole or mixed number, is:
\[ \boxed{75 \frac{1}{5}} \]