“…Citrulline is a non-essential amino acid considered a biomarker for enterocyte mass, epithelial cell damage, and absorptive function [ 41 , 42 ]. The administration of citrulline to pregnant ewes and cows improves embryo survival [ 43 ] and tends to increase the number of antral follicles in the ovaries of ewes [ 44 ]. Furthermore, citrulline has several functions: protein synthesis, intestinal homeostasis, nitrogen balance, growth and development, anti-oxidation, muscle performance, intestinal functions, renal function, exercise performance, blood pressure, vasodilation, and anti-inflammatory action [ 45 , 46 , 47 , 48 ].…”