Cardiff North MP Jonathan Evans said "we should be replacing experimentation on animals with as many alternatives as possible", and called for action to make steps in that direction.
He said "there should be much more done" by the research and the pharmaceutical industries "to ensure we cut down significantly on the number of animals that are used."
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A mostly cloudy and murky day with widespread hill fog and outbreaks of rain.
Official figures show areas of Caerphilly, Rhyl, Wrexham, Rhondda Cynon Taf and Bridgend to be the most deprived in Wales.
A £500 million investment has been secured for a new riverside development in Cardiff, which would link the City Centre with Cardiff Bay.