Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Forest diagram of meta−analysis of RPM on milk yield of dairy cows. The black solid line represents the average difference of the effect, the point on the left of the black solid line represents the decrease of the effect, the point on the right represents the increase of the effect, the grey square represents the effect value of each study group, and the black square represents the overall effect value.
