. additionally , the pro forma amounts include an increase to cost of sales by $ 1.6 million in fiscal 2017 and $ 5.1 million in fiscal 2018 to reflect the impact of using the lifo method of inventory valuation on blue buffalo 2019s historical operating results . pro forma amounts include related tax effects of $ 125.1 million in fiscal 2017 and $ 14.5 million in fiscal 2018