By Min Zeng 

Benchmark Treasury bonds pulled back on the final session of March, capping a losing month. But debt prices rallied during the first quarter.

Strengthening U.S. stocks on Monday sapped demand for haven bonds as investors readjusted their bond portfolio at the end of the quarter. The selling was kept in check by Federal Reserve Chairwoman Janet Yellen, whose comments on Monday soothed concerns over higher interest rates.

In late-afternoon trading, the benchmark 10-year note was 3/32 lower, yielding 2.723%, according to Tradeweb. Bond prices move inversely to their yields.

The yield rose by about 0.07 percentage points in March.

For the quarter, it dropped 0.3 percentage points, the most on a three-month basis since June 2012. The yield was 3.03% at the end of last year, the highest level since July 2011.

The surprising drop in the yield this quarter was driven by uncertainty over the global growth outlook. A slew of data from the U.S. and China have been disappointing while stress in some developing nations.

Analysts said upcoming U.S. economic releases will be key factors for the direction of bond yields.

Tony Crescenzi, senior market strategist and portfolio manager at Pacific Investment Management Co. in Newport Beach, Calif., which has $1.91 trillion assets under management, said bond yields "would grind higher if the economy picks up speed in coming months.

But he argues "2014 is not likely to be as disorderly as it was during the turbulent period last summer mainly because investors are more prepared now for rates to rise, having altered their fixed-income allocations accordingly."

Investors will zero in on several U.S. data releases this week in the manufacturing and service sectors and the labor market. The key release, the nonfarm jobs report for March, is due Friday. Economists expect the U.S. economy has added 200,000 jobs in March, up from 175,000 in February.

Traders and analysts said bond yields will rise if the economy is able to shake off the soft patch since January and inflation rises, which would bring forward the timing for the Fed's first interest-rate increase in years.

Without signs of the economy picking up speed or a persistent rise in consumer prices, bond yields likely will continue to stay in the current range for longer and even drop below 2.5% if the economy falters, they said.

"We're still range-bound in the short term, with a slow bias towards higher rates later in the year," said Guy LeBas, managing director of fixed income strategy at Janney Montgomery Scott in Philadelphia.

Mr. LeBas expects the 10-year yield to rise to 3.3% at the end of December.

The 10-year yield rose over 1 percentage point last year, driven by the prospect of reduced bond buying from the Fed.

Traders said shorter-dated Treasury bonds are more vulnerable to selling this year, which would be a change from last year, when longer-dated bonds took the brunt. They argue investor focus has shifted away from reduced bond-buying from the Fed and toward when the Fed will start raising short-term interest rates.

The bearish wagers on shorter-dated bonds might get hit if the Fed continues to keep interest rates near zero for longer.

On Monday, shorter-dated Treasury bonds strengthened after Ms. Yellen argued there is still substantial slack in the economy, holding down inflation and giving room for the central bank to keep interest rates lower for longer.

The two-year note was 1/32 higher on Monday, with its yield sliding to 0.43%.

COUPON ISSUE PRICE CHANGE YIELD CHANGE

1/4% 2-year 99 28/32 up 1/32 0.430% -2.0 BP

3/4% 3-year 99 20/32 up 3/32 0.879% -2.9BP

1 1/2% 5-year 99 16/32 up 1/32 1.727% -0.8BP

2 3/8% 7-year 99 22/32 flat 2.299% flat

2 3/4% 10-year 100 7/32 dn 3/32 2.723% +1.1BP

3 3/4% 30-year 101 5/32 dn 10/32 3.562% +1.8BP

2-10-Yr Yield Spread: +229.3 BPS Vs +226.2 BP

Source: Tradeweb

Write to Min Zeng at min.zeng@wsj.com

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