Two cows of the same age from one bull were sold to different farms. One of the cows began to give more milk after a while

Two cows of the same age from one bull were sold to different farms. One of the cows began to give more milk after a while compared to the other. At the same time, the fat content of milk did not change and remained almost the same for both cows. Explain what it is connected with.

This is due to modification variability. On the farm, where the cow gave more milk, conditions were better, such as: feed, care.

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