percentage point benefit from acquisitions. Price/mix increased 1%, largely reflecting pricing adjustments associated with multi-year contracts.
Foodservice segment net sales increased $32.8 million, or 6%, to $610.3 million, compared with $577.5 million in the first half of fiscal 2019. Volume increased 3 percent, led by growth in distributor private label and Lamb Weston branded products. Price/mix increased 3 percent, primarily reflecting improved mix and pricing actions initiated in the fall of 2018 and fall of 2019.
Retail segment net sales increased $21.3 million, or 9%, to $261.4 million, compared with $240.1 million in the first half of fiscal 2019. Volume increased 6 percent, driven by increased sales of private label products as well as Grown in Idaho and other branded products. Price/mix increased 3 percent, driven by favorable mix and pricing actions.
Net sales in our Other segment increased $7.4 million, or 10%, to $79.3 million, compared with $71.9 million in the first half of fiscal 2019, largely due to increased volumes in our vegetable business, partially offset by lower price/mix.
Product Contribution Margin
Lamb Weston’s product contribution margin for the first half of fiscal 2020 was $522.9 million, an increase of $55.8 million, or 12%, compared to the first half of fiscal 2019.
Global segment product contribution margin increased $24.7 million, or 12%, to $231.6 million in the first half of fiscal 2020, driven by volume growth and favorable price/mix. Global segment cost of sales was $823.2 million, up 13% compared to the first half of fiscal 2019, due to higher sales volumes; input cost inflation; higher manufacturing costs due to factory inefficiencies, which were primarily driven by higher maintenance and related costs; and higher depreciation expense primarily associated with the new Hermiston production line. The increase in cost of sales was partially offset by lower transportation costs.
Foodservice segment product contribution margin increased $14.4 million, or 7%, to $213.8 million in the first half of fiscal 2020, driven by favorable price/mix and volume growth. Cost of sales was $393.4 million, up 5% compared to the first half of fiscal 2019, due to higher sales volumes; input cost inflation; higher manufacturing costs due to factory inefficiencies; and higher depreciation expense primarily associated with the new Hermiston production line. The increase in cost of sales was partially offset by lower transportation costs.
Retail segment product contribution margin increased $8.8 million, or 18%, to $57.4 million, largely due to higher price/mix, volume growth and lower advertising and promotional expenses. Cost of sales was $198.8 million, up 8% compared to the first half of fiscal 2019, primarily due to higher sales volumes; input cost inflation; higher manufacturing costs due to factory inefficiencies; and higher depreciation expense primarily associated with the new Hermiston production line. The increase in cost of sales was partially offset by lower transportation costs. Advertising and promotion spending declined $1.7 million to $5.2 million in the first half of fiscal 2020 as compared to the first half of fiscal 2019, reflecting the timing of marketing investments in support of Grown in Idaho, Alexia and other branded products.
Other segment product contribution margin was $20.1 million, an increase of $7.9 million as compared with $12.2 million of income in the first half of fiscal 2019. These amounts include a $7.3 million gain related to unrealized mark-to-market adjustments and realized settlements associated with commodity hedging contracts in the first half of fiscal 2020, and a $4.0 million loss related to the contracts in the prior year period. Excluding these adjustments, Other segment product contribution margin declined $3.4 million, largely due to lower price/mix in our vegetable business.
Selling, General and Administrative Expenses
Selling, general and administrative expenses increased $17.2 million, or 11%, to $170.2 million in the first half of fiscal 2020 compared with the same period in 2019. The increase was largely driven by a $7 million increase in incentive compensation expense accruals primarily based on our operating performance, as well as investments in our sales, marketing, operating and systems capabilities, including approximately $4 million of expense associated with designing