The Walt Disney Co. said it is digging in for a lengthy standoff with Google-owned YouTube TV over carriage fees — stoking investor fears over the Mouse House’s struggling TV business and sending its stock plunging more than 9% .

Disney’s impasse with YouTube has put a dent into ABC’s ratings, particularly during its evening news cast. For the first time in months, ABC “World News Tonight” with David Muir drew fewer viewers in the 25-54 age demographic than its rival on NBC.

Disney’s fiscal fourth-quarter earnings report showed that profits from its linear TV division, which includes ABC, fell 21% year-over-year to $391 million.

Hugh Johnston, Disney’s chief financial officer, told CNBC on Thursday that the company “built a hedge” into its forecasts assuming that negotiations with G

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