Cruelty Free International has published footage that appears to show Vivotecnia lab cutting into animals without having received anaesthetics.
Demonstrators shouted slogans such as "Freedom for Pablo Hasel" and "We are the anti-fascists", as they took to the streets in the Spanish capital.
Rapper Pablo Hasel's case has put the spotlight on freedom of expression in Spain, prompting the government to announce it would relax free speech laws.
The world champion ran 7.29 seconds to shave off 0.01 second of the time set by Briton Colin Jackson in 1994.
Real Madrid are back within touching distance of the top of La Liga after they punished another Atletico Madrid slip against Levante by beating Real Valladolid 1-0.
Police and demonstrators in Barcelona have clashed for a fifth night with thousands hitting the streets across Spain in protest against the jailing of a controversial rapper.
Pablo Hasel is in detention over a series of tweets in which he accused former king Juan Carlos I of being a mafia boss and said Spanish police tortured and killed demonstrators and migrants.
Images from the scene showed the walls on the top four or five storeys of the residential building in the heart of the La Latina neighbourhood had been blown out
Ten provinces of central Spain were on their highest level of alert for Storm Filomena, including the capital, Madrid, where authorities have activated the red warning for the first time.
British expatriates residing in Spain are unable to board flights to Barcelona and Madrid after airlines claimed their papers were no longer valid post-Brexit.
A third consecutive league win took third-placed Real on to 26 points after 13 games, level with second-placed Atletico Madrid and leaders Real Sociedad but having played two games more than Atletico.
Real Madrid have been crowned La Liga champions for the 34th time after Karim Benzema scored twice in a 2-1 victory over Villarreal which clinched the title with one game to spare.
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