Artificial selection to obtain cows yielding higher milk output represents
Artificial selection to obtain cows yielding higher milk output represents
Stabilizing selection as it stabilizes this character in the population
Directional as it pushes the mean of the character in one direction
Disruptive as it splits the population into two one yielding higher output and the other lower output
Stabilizing followed by disruptive as it stabilizes the population to produce higher yielding cows
Solution
Artificial selection to obtain cow yielding higher milk output will shift the peak to one direction, hence, will be an example of Directional selection. In stabilizing selection, the organisms with the mean value of the trait are selected. In disruptive selection, both extremes get selected (more individuals acquire peripheral character value at both ends of the distribution curve).