The U. S. dairy cow industry produced milk from just over – million cows in 1924. Today, it relies on just under – million. And yet total milk production today is a little over – what it was in 1924. This is possible because the typical cow produces – as much milk, thanks to strategic breeding and changes in how –.

Cattle is being influenced by changes in the environment and improvement in managerial practices

Explanation:

Strategic breeding and changes in nutritional environment and improved managerial practices contribute to the fact that a little higher milk production in the Us today than in 1924 is done with less quantity of livestock (just below million cows). External environment stimulus to which animals respond interacts with their genotypes and determines the levels of performance.

answer; niosh, the national institute for occupational safety and health;