New Cornell University Study shows the effect of injectable trace mineral on health and production of lactating Holstein cows

The objective of this study by Cornell University was to evaluate the effect of subcutaneous supplementation of 300 mg of zinc, 50 mg of manganese, 25 mg of selenium, and 75 mg of copper (MULTIMIN^®® North America, Inc., Fort Collins, Co) at 230 days of gestation, 260 days of gestation, and 35 days postpartum, on health, milk production and reproduction of lactating Holstein cows. A randomized field trial was conducted on 3 large commercial dairy farms located near Ithaca, New York and 1416 cows were enrolled. Subcutaneous TMS significantly decreased linear Somatic Cell Count (SCC) scores as compared to control cows. The interaction of parity (1, 2, > 2) and treatment group (Control vs. TMS) was significant; the effect of treatment on linear score increased as parity group increased and the greatest reduction in linear scores was observed in parity > 2 cows treated with TMS. Control cows had 1.31 times higher odds of subclinical mastitis than TMS cows. The main effect of treatment on clinical mastitis was not significant, however; the interaction of treatment and parity was significant with a reduction of 39% in the cumulative incidence of clinical mastitis observed for multiparous cows treated with TMS. Additionally, control cows had 1.69 and 1.30 increased odds of having stillbirth parturitions and endometritis, respectively.

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