Undetected failure of passive transfer (FPT) of immunoglobulin is a major determinant of mortality in newborn alpaca cria, and early detection with proactive management can reduce mortality rates in cases of suspect FPT. The goal of this prospective observational study was to evaluate maternal serum IgG levels as a predictor for subsequent cria FPT (IgG 2000 mg/dl (n = 13). Analysis of variance within maternal groups revealed significant differences in cria birth IgG levels, whereby the highest levels were observed when dam IgG measured 1000-1499 mg/dl, followed by 1500-2000 mg/dl and cria had the lowest birth IgG levels from dams exhibiting IgG levels > 2000 mg/dl (640 mg/dl, 554 mg/dl and 545 mg/dl respectively). Although there were cria with birth IgG
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