Selling, general and administrative expenses for the supply chain segment were $503.7 million for the year ended December 29, 2018, compared to $478.9 million for the year ended December 30, 2017, an increase of $24.8 million, or 5.2%. The change was due to $14.6 million of additional costs from acquired companies and $10.2 million of additional operating costs.
Selling, general and administrative expenses for the technology and value-added services segment were $34.8 million for the year ended December 29, 2018, compared to $37.8 million for the year ended December 30, 2017, a decrease of $3.0 million, or 8.1%.
As a component of total selling, general and administrative expenses, selling expenses were $199.1 million for the year ended December 29, 2018, compared to $186.9 million for the year ended December 30, 2017, an increase of $12.2 million, or 6.5%. As a percentage of net sales, selling expenses for the year ended December 29, 2018 were 5.3%, compared to 5.2% for the year ended December 30, 2017, an increase of ten basis points.
As a component of total selling, general and administrative expenses, general and administrative expenses were $339.4 million for the year ended December 29, 2018, compared to $329.8 million for the year ended December 30, 2017, an increase of $9.6 million, or 2.9%. As a percentage of net sales, general and administrative expenses were 9.0% for the year ended December 29, 2018, compared to 9.2% for the year ended December 30, 2017, a decrease of 20 basis points.
Selling, general and administrative expenses include expense allocations for: (i) certain corporate functions historically provided by Henry Schein, including accounting, legal, information services, planning, compliance, investor relations, administration and communication, and similar costs; (ii) employee benefits and incentives; and (iii) stock-based compensation. The allocations may not reflect the actual expenses that the Animal Health Business would have incurred as a standalone company for the periods presented. During the years ended December 29, 2018 and December 30, 2017, the Business was allocated $55.4 million and $58.7 million, respectively, of general corporate expenses, which are included within selling, general and administrative expenses.
Other Income, Net
Other income, net for the fiscal years ended December 29, 2018 and December 30, 2017 was as follows:
| | | | | | | | | | | | | | | | |
Dollars in thousands | | Year Ended December 29, 2018 | | | Year Ended December 30, 2017 | | | Variance | |
| $ | | | % | |
Interest income | | $ | 5,745 | | | $ | 5,115 | | | $ | 630 | | | | 12.3 | % |
Interest expense | | | (2,770 | ) | | | (2,587 | ) | | | (183 | ) | | | 7.1 | |
Other, net | | | 3,104 | | | | 919 | | | | 2,185 | | | | * | |
| | | | | | | | | | | | | | | | |
Other income, net | | $ | 6,079 | | | $ | 3,447 | | | $ | 2,632 | | | | * | |
| | | | | | | | | | | | | | | | |
Other income, net was $6.1 million for the year ended December 29, 2018, compared to $3.4 million for the year ended December 30, 2017, an increase of $2.6 million. Other, net was $3.1 million for the year ended December 29, 2018, an increase of $2.2 million from the year ended December 30, 2017. The change was primarily due to investment proceeds, the impact of foreign currency exchange rates and losses from fixed asset disposals in year ended December 30, 2017.
Income Taxes
For the year ended December 29, 2018, the effective tax rate was 25.9% compared to 34.6% for the prior year period. In 2018, the effective tax rate was primarily impacted by an increase in the estimate of transition tax
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