* Ireland expected to launch 30-year bond this week
* Portugal yields hit record lows at auction
* German Bund yield at fresh 5-week lows
* But Italy bond yields jump 10 bps
* Euro zone periphery govt bond yields tmsnrt.rs/2ii2Bqr (Updates prices)
By Dhara Ranasinghe
LONDON, May 8 (Reuters) - Portuguese, Irish and Spanish yields hit historic lows on Wednesday and Portugal saw firm demand at an auction as investor interest in long-dated euro zone debt tightened its grip on European bond markets.
Italian yields, however, rose on concerns over tension within Rome’s ruling coalition, with 10-year bonds rising 10 bps to 2.689 percent at one stage, pushing the gap over Germany to 273 bps, its widest in over two months.
“Because there’s still some uncertainty around Italy, while Spain and Portugal are more stable, Spanish and Portuguese bonds continue to benefit,” TD Securities European rates strategist Pooja Kumra said.
The European Commission had cut its growth prediction for Italy on Tuesday and said its public finances would deteriorate further, in an assessment that could reignite a row with Rome over its budget after an uneasy truce in December.
Italian bonds had calmed by Wednesday’s close, with the 10-year yield at 2.61 percent, up just 2 bps on the day.
In a sign of investor demand, Portugal sold all 1.25 billion euros ($1.4 billion) of the 10- and 15-year bonds it was offering, with yields hitting record lows.
Portuguese 10-year bond yields fell to a record low of 1.07 percent ahead of the auction before closing the day at around 1.09 percent.
Spain’s 10-year bond yield fell to 0.94 percent, its lowest in more than two years and Irish long-dated bond yields dropped below 0.5 percent for the first time since December 2017.
“There is still strong demand for bonds which is why May has started with strong issuance,” TD Securities’ Kumra said.
Ireland said on Tuesday it would sell a new 2050 bond via a syndicate of banks and analysts said the deal was likely to come before the end of the week.
A weak economic backdrop and speculation that the European Central Bank (ECB) will keep rates at record lows for longer than anticipated has sparked a fixed income rally this year.
Sluggish global growth and a dovish tone from central banks have also helped — New Zealand’s central bank on Wednesday cut interest rates for the first time in 2-1/2 years.
But with yields on higher-rated paper such as 10-year German debt below zero percent, which essentially means investors are paying to hold those bonds, investors have moved into lower-rated markets to secure a yield.
That makes a favourable backdrop for this week’s euro zone bond sales, with focus now turning to Ireland.
Its new 30-year bond comes just weeks after strong demand for a new 30-year Cypriot bond.
“We’ve been getting fairly solid feedback on the long end - not just Ireland - for quite some time now,” said a lead manager involved in the Irish deal.
Most euro zone bond yields extended falls sparked by this week’s downward revision to euro zone growth forecasts from the EC and renewed U.S./China trade tensions.
Germany’s 10-year bond yield hit a fresh five-week low at minus 0.059 percent, while British and U.S. long-dated bond yields fell to their lowest since early April .
Reporting by Dhara Ranasinghe; Editing by Janet Lawrence, Kirsten Donovan and Alexander Smith