Business Acquisitions Vets First Choice On February 7, 2019, we acquired Vets First Choice. See Note 1 - Business Overview and Significant Accounting Policies . During the third quarter ended September 30, 2019, we recorded a measurement period adjustment, which was made to reflect the facts and circumstances in existence as of the acquisition date. This adjustment reflects a reduction to the purchase price of $30 million , offset by a corresponding decrease to goodwill. This measurement period adjustment related to the cancellation of 700,400 Covetrus shares issued to Vets First Choice shareholders that were held in escrow. During the fourth quarter ended December 31, 2019 , we recorded a final measurement period adjustment of $4 million which increased the deferred tax liability with a corresponding decrease to goodwill. The estimated consideration and fair value in the tables below have been updated to reflect this measurement period adjustment. The acquisition date fair value of the consideration transferred consisted of the following: Estimated Consideration Total Covetrus shares issued to Vets First Choice shareholders 39,041,689 Per share price (in actuals) (a) $ 43.05 Total fair value of shares issued to Vets First Choice shareholders $ 1,681 Fair value of Vets First Choice replacement stock option awards attributable to pre-acquisition service 62 Vets First Choice debt repaid at close 24 Vets First Choice expenses paid at close 18 Less: Vets First Choice cash used to fund transaction (9 ) Total consideration $ 1,776 (a) Closing price on February 7, 2019, Covetrus shares trading on a when-issued basis (Nasdaq: CVETV) The purchase price was allocated to the underlying assets acquired and liabilities assumed based upon their estimated fair values at the date of acquisition. The following table summarizes the allocation of the purchase price to the assets acquired and liabilities assumed: Estimated Fair Value Fair value of net assets acquired $ 14 Goodwill 1,324 Intangible assets 545 Deferred tax liabilities (107 ) Total acquisition cost $ 1,776 We determined the estimated fair value of the identifiable intangible assets after review and consideration of relevant information including discounted cash flow analysis, market data, and managements estimates. We engaged an independent valuation firm to assist in determining the fair value of the acquired intangible assets. The value attributed to the other identifiable intangible assets included $20 million in trademarks and trade names, $50 million in product formulas, $125 million in customer relationships, and $350 million in developed technologies. These intangible assets are being amortized over a weighted-average period of seven years . The goodwill from this transaction arose because of our expected ability to leverage existing and new marketing opportunities across a larger revenue base. The goodwill from this transaction is not deductible for tax purposes. The results of operations of Vets First Choice are included in our consolidated results of operations since February 7, 2019, during which period Vets First Choice contributed revenue of $246 million and net loss of $525 million . The following unaudited pro forma financial information presents the results of operations for the years ended December 31, 2019 and December 29, 2018 as if the Acquisition had occurred as of December 31, 2017. The unaudited pro forma results reflect certain adjustments for items that are not expected to have a continuing impact, such as adjustments for transaction costs incurred, management fees, and purchase accounting. The information presented below has been prepared for comparative purposes only and does not purport to be indicative of either future results of operations or the results of operations that would have occurred had the Acquisition been consummated on December 31, 2017: Years Ended December 31, 2019 December 29, 2018 Net sales $ 4,000 $ 3,981 Goodwill impairment $ 938 $  Net loss $ (1,032 ) $ (63 ) Net loss attributable to Covetrus $ (1,029 ) $ (63 ) Other We completed certain other acquisitions during the year ended December 31, 2019 which were not material to our consolidated financial statements individually or in the aggregate.