When late pregnant ewes supplemented with Nannochloropsis, their lambs’ blood levels of TNF-α and stillbirth (47.6 ± 1.7 pg/ml and 10%) were significantly (P < 0.05) lower than those in the control groups (68.3 ± 3.2 pg/ml and 30%) respectively, while their WBCs, Hb, RBc count, birth weight, and body temperature were significantly (P < 0.05) higher. The gene discussed is GSTM1; the disease is Stillbirth.