Opposition lawmakers hurled pig organs inside Taiwan's parliament on Friday to protest the government's decision to ease restrictions on pork imports from the United States.

Taiwan's notoriously rambunctious legislature frequently sees chaotic clashes between rival lawmakers but Friday's scuffles were particularly novel.

Lawmakers from the opposition Kuomintang (KMT) party dumped buckets of pork offal on the debating chamber floor and then proceeded to hurl intestines, hearts, liver and other organs at their rivals.

Taiwan's government recently announced it would allow imports of US pork fed with the additive ractopamine from 1 January.

The supplement improves leanness but is banned in places like the European Union and China.

Officials in Washington have made it clear restrictions on US pork and beef imports are a key stumbling block to the US and Taiwan signing a trade deal.

Taiwan's President Tsai Ing-wen and her Democratic Progressive Party, which commands a strong majority in parliament, hope the easing of restrictions will pave the way for an agreement.

Taiwanese legislators
Legislators from Taiwan's KMT on Friday protested the government's decision to ease restrictions on pork imports from the US Photo: AFP / Sam Yeh

But many in Taiwan are opposed to US pork imports and the KMT have seized on the issue after a series of stinging electoral defeats.

Last weekend they joined tens of thousands in an annual labour rally, where opposition to pork imports was a major theme.

Taiwan's powerful domestic pork industry also fears competition from the US.

The DPP campaigned heavily against ractopamine when they were in opposition, and the KMT have accused them of hypocrisy.

The governing party now argues the additive is not a safety threat and that the deal will boost ties with the US, a valuable trading partner and strategic ally against China.

"We're very sorry to throw pig's internal organs in parliament, but this is to highlight the pork issue," opposition lawmaker Lin Wei-chou told reporters.

Lin Chu-yin, a DPP legislator, posted pictures of the discarded offal on her Facebook account.

"The opposition party has the right to protest, but they shouldn't be wasting food," she wrote.

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