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.
Vitamin A (retinol) in normally calving cows (control) and cows with stillbirth (stillbirth). a,b: Significant difference between the two groups (P<0.05). In the box plot, the horizontal line represents the median, and the whiskers indicate the lowest and highest data points that are within 1.5 the interquartile range.
