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Serum concentrations of progesterone (ng/mL) were collected across time in Criollo x Saanen-Alpine yearling goats (n = 16, 8/group). Experimental groups consider glutamate (GLUT) and control (CONT) under natural photoperiodic conditions during the anestrous season (March to April) in northern Mexico (26°LN). Note: Whereas the onset of both blood sampling and treatments are indicated, a line denoting the prevailing photoperiod during the experimental period is also included.
