Richard Johnson
Analyst · G. Research
Well, thank you, Jack, and thank you, Damian.
So first, let's review the results for our first quarter ended in September. Our consolidated sales were $195 million for the quarter. That was an increase of $5.5 million or 3% compared to the same quarter a year ago. The sales increase was driven by the Animal Health segment as we saw increased demand and volume growth across the product portfolio, primarily in international. Mineral Nutrition net sales declined, while Performance Products net sales were about comparable to the prior year.
Our September results reflected a partial recovery from the reduced demand we saw in our June 2020 quarter, which was more affected by the pandemic. On a reported basis, net income of $12.3 million increased approximately $10 million over the prior year, driven by increased gross profit with a partial offset from higher operating expenses and foreign currency gains in the current year.
Diluted earnings per share was $0.30 per share for the current quarter, an increase of $0.24 per share, reflecting the increased income.
Now let's discuss adjusted results on the following page. And looking at selected line items from the P&L, I'll discuss net sales in more detail at the individual product level -- at the segment level, pardon me.
But it's important to note that in total, adjusted gross profit increased $6.2 million or 10% when compared to the prior year. That improvement in adjusted gross profit was much stronger than the sales growth and reflected favorable product mix as well as favorable production costs and plus a somewhat unfavorable mix in our quarter a year ago.
Looking at adjusted gross profit by segment. Animal Health increased due to sales growth, favorable product mix and favorable production costs, which were primarily driven by favorable foreign currency movements. Mineral Nutrition gross profit declined due to unfavorable production costs, and Performance Products gross profit increased as a result of the favorable product mix and production costs.
Overall, our adjusted SG&A or operating expenses increased $1.6 million or 4%. In the Animal Health segment, incremental professional fees that we incurred to support the continued safe use of carbadox and higher costs associated with new products were partially offset by the favorable effects of foreign currency movements and timing of marketing spending.
Corporate SG&A increased due to the increased cost of strategic initiatives. Costs in our other parts of our business, that is Mineral Nutrition and Performance Products were comparable to the prior year.
At the income tax line, the effective tax rate on an adjusted basis was 31% in the current quarter compared to 28% from the prior year. And that all resulted in adjusted diluted EPS of $0.27 per share, an increase of $0.08 per share or 42%, consistent with the growth in net income.
Now looking more closely at the Animal Health business. We saw net sales of $128 million, and that was an increase of $6.5 million or 5% compared to the same period last year. In the MFAs and other category, net sales of approximately $79 million increased almost $4 million or 5%, driven by increased international demand for poultry products, coupled with favorable timing of certain customer orders.
In the nutritional specialty products category, net sales of $32.6 million grew better than $2 million or 7% year-over-year. During the quarter, we experienced international growth in dairy products, while domestic sales were roughly comparable to the prior year.
In the vaccine area, net sales were $17 million, an increase of close to $1 million or 4%, driven by international demand for our poultry vaccines. That all resulted in adjusted EBITDA for the segment of $30 million for the quarter, an increase of $5 million or 20% over the prior year. The overall sales growth and related gross profit increases were partially offset by increased SG&A spending.
And then looking at our other segments. Mineral Nutrition net sales were slightly over $51 million for the quarter, and that was a decrease of probably $1 million compared to the prior year or 2%. We did see volume growth, but the volume growth was more than offset by lower average selling prices. Just as a reminder, the lower average selling prices are generally correlated with the movement of underlying raw material costs.
We saw a decline in gross profit due to unfavorable production costs, and adjusted -- and as a result, adjusted EBITDA was $3 million, down $400,000 compared with the same quarter last year, basically attributable to the decline in gross profit.
In the Performance Products segment, net sales were about $15 million and roughly comparable to the prior year. The -- we saw increased sales of personal care product ingredients, but those sales were partially offset by reduced sales of copper-based products.
While overall sales were comparable, we saw higher gross profit that drove about a $1 million increase in adjusted EBITDA. Gross profit increase was due to favorable product mix as well as production costs.
And in our corporate area, expenses that we don't allocate to our business segments, corporate expenses of roughly $11 million increased about $1 million over the prior year as we continue to invest in strategic initiatives for future growth.
Looking at capitalization. Our gross leverage ratio of debt to trailing-12 EBITDA was 3.7x at September 30, 2020. We had $92 million of cash and short-term investments on the balance sheet at quarter end. And for the September quarter, we used $6 million of cash before financing, excluding the changes in short-term investments.
And finally, we did pay and we'll pay another routine quarterly dividend, paid one in September and have declared another routine dividend to be paid in December of $0.12 a share, which in the aggregate is about $4.9 million.
And now let me turn to our guidance for our December quarter. We continue to forecast only near-term expectations given the uncertainty of the future course of the pandemic and the ongoing difficult conditions in the industry. The animal production industry continues to recover from the effects of the pandemic. We believe industry conditions will continue to normalize as we progress through our fiscal year and the industry gradually will return to typical operating levels.
Our expected financial results for the December quarter -- for the 3 months ending December. Our net sales of approximately $205 million, resulting in net income of approximately $9 million, which then would be diluted earnings per share of $0.23 per share. And on an adjusted basis, adjusted EBITDA of $26 million, and that would result in adjusted diluted EPS of $0.28 per share.
We are encouraged by the improving trends in our business. Compared to our September quarter just ended and that we're talking about today, our expected December quarterly results, including net sales, adjusted EBITDA and adjusted diluted EPS, are expected to be increases quarter-over-quarter. However, compared to the same period last year, our expected December quarterly results are lower than a year ago as our business continues to gradually recover from the effects of the pandemic. Most all lines will basically be below the year-ago numbers as we've shown in the charts and in our press release.
So that's the conclusion of our prepared remarks. And operator, if you would then please open the line for questions. Thank you.