Discovery Communications Inc.'s (DISCA) first-quarter profit nearly doubled on continued growth in U.S. and international advertising and affiliate sales, as well as a $102 million gain tied to the company's 50-50 joint-venture with TV star Oprah Winfrey on her branded cable network.

On a conference call with analysts following its release, Discovery Chief Executive David Zaslav said recent strength in the TV advertising business remains in place as the company moves into its key ad sales season, known as the upfront, and he expects "significant increases."

The cable network owner, home of hit shows like "Deadliest Catch" and "Storm Chasers," raised its full-year revenue forecast to a range of $4.03 billion to $4.13 billion from its previous view of $4 billion to $4.1 billion. The new outlook brackets the average estimate of analysts polled by Thomson Reuters.

Class A shares of Discovery recently rose 2.8% to $43.59. The stock has gained over 17% over the past year.

Discovery has been revamping its portfolio of cable networks to attract a larger audience in hopes of driving advertising growth and to put the company in a stronger position to negotiate affiliate deals with distributors. Cable networks have generally been gaining audience share from broadcast networks and according to Standard & Poor's Ratings Services, Discovery's new programming has attracted higher audience ratings on the company's main U.S. channels over the past few years.

The company launched its Oprah Winfrey Network, or OWN, in January, and earlier this month said it would bulk up the channel with six new series, in an attempt to boost lagging prime-time viewership.

Zaslav acknowledged Thursday that early audience ratings for OWN have been a disappointment, but he noted much of the key programming that is expected for the channel--like a talk show starring Rosie O'Donnell--has yet to air. Advertisers are still enthusiastic about the venture's potential, he said.

"It has been a slower start," said Zaslav. "This is a long-term play building a channel. It's going to take us a while and we're committed to it."

The company invested $57 million in OWN in the first quarter alone, and Chief Financial Officer Brad Singer said he expects the company will invest more than in the network than its latest total estimate of $215 million.

On Thursday, Discovery posted quarterly profit of $305 million, or 74 cents a share, up from $169 million, or 39 cents a share, a year earlier. Revenue jumped 9.4% to $951 million.

Analysts surveyed by Thomson Reuters projected a profit of 47 cents a share on revenue of $938 million.

Discovery's sales in the U.S. grew 7.5%, driven by a 9% jump in ad revenue, while distribution revenue increased 5.8%. Excluding Discovery Health, which was replaced at the beginning of the year by OWN, ad revenue climbed 15% in the U.S.

The company's international networks, widely viewed as a key growth opportunity for the company, posted a 14% jump in sales on 24% improvement in ad sales and an 11% increase in distribution revenue.

Discovery is part-owned by Liberty Media Corp. (LINTA, LCAPA, LSTZA) Chairman John Malone.

-By Nat Worden, Dow Jones Newswires; 212-416-2472; nat.worden@dowjones.com

(John Kell contributed to this story.)
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