During the three months ended September 30, 2016, we incurred $1.3 million in acquisition-related transaction costs for professional fees and other items in the evaluation and negotiation of an unsuccessful acquisition. Excluding these costs, SG&A used in calculating Adjusted EBITDA increased $0.6 million, or 2%.
Animal Health accounted for $0.4 million of the increase, driven by increased sales force and development costs. Mineral Nutrition SG&A decreased $0.2 million due to one-time costs in the prior year. Corporate expenses accounted for $0.4 million of the increase due to increased compensation and benefit costs.
Interest expense, net
Interest expense, net of $3.9 million for the three months ended September 30, 2016, increased $0.1 million, or 2%, compared to the three months ended September 30, 2015. Interest expense increased $0.7 million due to increased borrowings under our Revolver, compared to the same three-month period last year, and increased acquisition-related accrued interest. Interest income increased $0.6 million from interest on deposits in foreign jurisdictions.
Foreign currency (gains) losses, net
Foreign currency (gains) losses, net for the three months ended September 30, 2016, amounted to net losses of $0.3 million, as compared to $5.5 million in net gains for the three months ended September 30, 2015. Foreign currency losses in the three months ended September 30, 2016, were primarily due to the movement of Brazil and Israel currencies relative to the U.S. dollar. Foreign currency gains and losses primarily arise from intercompany balances.
Provision for income taxes
The provision for income taxes was $5.4 million and $4.7 million for the three months ending September 30, 2016, and September 30, 2015, respectively. The effective income tax rates for these periods were 30.7% and 20.2%, respectively. The increase of 10.5% during the three months ended September 30, 2016, was primarily due to the benefit of a valuation allowance during the three months ended September 30, 2015, which offset the majority of our domestic income tax provision. In addition, we recognized an income tax benefit related to certain discrete items during the three months ended September 30, 2015. Excluding the benefits of the prior year valuation allowance and discrete items, the effective income tax rate for the three months ended September 30, 2015, was approximately 33%.
Our effective tax rate may be impacted due to the effects of various discrete items, the fluctuation in tax rates in foreign jurisdictions, as well as the amount of income earned in our foreign subsidiaries, some of which may have significant net operating loss carryforwards. As of September 30, 2016, we maintained a full valuation allowance against the deferred tax assets related to our foreign net operating loss carryforwards. We review the realizability of our deferred tax assets and evaluate our valuation allowances on a quarterly basis, or whenever events or changes in circumstances indicate that a review is required. We will continue to evaluate the necessity of these foreign valuation allowances in future periods, and to the extent that a positive earnings trend continues, a significant portion of these allowances may be released in future periods.
Net income
Net income of $12.2 million for the three months ended September 30, 2016, decreased $6.6 million, compared to net income of $18.8 million for the three months ended September 30, 2015. The decrease was a result of the factors described above, including a $5.8 million decline in foreign currency (gains) losses, net and a $0.7 million increase in income tax expense.
Adjusted EBITDA
Adjusted EBITDA of $29.8 million for the three months ended September 30, 2016, increased $2.1 million, or 8%, as compared to the three months ended September 30, 2015. Animal Health Adjusted EBITDA increased $1.1 million, or 4%, due to sales growth and increased gross profit, partially offset by