BRASILIA--Brazilian stocks were nearly flat at closing Tuesday, when early optimism about the global economy was tempered with some disappointing results by local companies and a bill to reform the country's ports got stuck in Congress.

The Bovespa index closed at 54666 points, 0.4% higher than its Monday close.

Trading opened under the positive influence of the Organization for Economic Cooperation and Development, or OECD, which said Tuesday that its composite leading indicators for March showed a likely pickup in economic growth in the U.S., Japan and the troubled euro zone.

Meanwhile, during the whole day the Brazilian House of Representatives approached the deadline to vote on a bill sent by the executive branch to overhaul the country's sea ports, which are largely viewed as outdated and not fit to handle Brazil's foreign trade. As the stock market closed, lawmakers were still unable to bring the bill to a vote.

On the other hand, shares of Brazilian meatpacker Marfrig Alimentos SA (MRRTY, MRFG3.BR) soared as it announced plans to cut its debt by as much as BRL2 billion ($1 billion) in 2013 through cost-cutting, smaller-units sales and restructuring. The company announced earlier a loss of BRL401.1 million in the first quarter, compared with a loss of BRL341.9 million in the same period a year earlier.

Marfrig shares rose 12.9% and closed at 6.60 Brazilian reais ($3.69) and were the main gainer. The price still is 18.5% lower than a year ago.

Also among the top gainers were two companies controlled by Brazilian billionaire Eike Batista: miner MMX Mineracao e Metalicos SA (MMXM3) and oil-and-gas company OGX Petroleo e Gas Participacoes SA (OGXP3). MMX rose 8.7% to BRL1.84 and is now 73% lower than a year ago, while OGX rose 5.4% to BRL1.67 and is down 86.5% in the past 12 months.

Real-estate developer MRV Engenharia e Participacoes SA (MRVE3) was the top loser, with a 6.7% drop to BRL8.01 a share that brought its 12-month decline to 32.7%.

Brazil's largest traded airline, Gol Linhas Aereas Inteligentes SA (GOLL4-B), rose 3.3% to BRL11.86 after reporting a first-quarter loss. The company's earnings before interest, taxes, depreciation, amortization and aircraft rental costs--or Ebitdar--rose to BRL366.5 million from BRL267.9 million a year earlier.

Mining giant Vale SA (VALE, VALE3.BR, VALE5.BR) shares, on the other hand, closed 2.4% lower at BRL31.07 as expectations for the economy of China, Vale's biggest customer, continued to worsen gradually after April industrial-production growth came in slower than expected.

Economists surveyed by The Wall Street Journal now see the world's No. 2 economy growing 7.8% this year, down from 8% at the end of 2012, according to median forecasts.

--Paul Kiernan, in Rio de Janeiro, collaborated in this article.

Write to Paulo Trevisani at paulo.trevisani@wsj.com

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