Tyson Foods Inc.'s profit jumped 32% in its latest quarter but still missed expectations because of weak beef sales, which caused the company to cut its full-year outlook.

Shares of Tyson fell 8% in premarket trading.

The Arkansas-based company—the largest U.S. meatpacker by sales—has benefited from its acquisition last year of Jimmy Dean sausage maker Hillshire Brands Co. Sales in Tyson's prepared-foods segment doubled in its latest quarter, as sales volume and the average sales price grew largely due to the Hillshire deal. Growth in that segment helped offset weakness in others.

Pork sales plunged 32% to $1.21 billion, as sales volume fell following Tyson's divestiture of its Heinold Hog Markets business. Chicken sales, meanwhile, declined 2.5% as lower feed-ingredient costs pressured the average sales price.

International sales dropped 33%, because of the sale of its Brazil business and weak demand in China. Exports have been challenged by foreign countries' bans on U.S. poultry purchases because of avian influenza.

While beef sales rose 2.8% during the period, Tyson said the business suffered from export-market disruptions and very high cattle costs.

"Unless beef market conditions improve rapidly," Chief Executive Donnie Smith said, "we will not achieve our previous guidance" for the year.

As a result, Tyson reduced its full-year earnings outlook to $3.10 to $3.20 a share, down from its earlier range of $3.30 to $3.40. Analysts have expected $3.44 a share, according to Thomson Reuters.

The company said it now anticipates increased cost savings from the Hillshire acquisition and lifted that estimate to $300 million for the 2015 business year. Previously, Tyson expected $250 million in savings.

In all, for the most-recent quarter, Tyson reported a profit of $343 million, up from $260 million a year earlier. On a per-share basis, earnings rose to 83 cents from 73 cents. Revenue increased 4% to $10.07 billion.

Analysts projected 92 cents in earnings per share on $10.3 billion in revenue, according to Thomson Reuters.

Write to Lisa Beilfuss at lisa.beilfuss@wsj.com

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