The Chief Minister also sent letters to all the Chief Ministers seeking their support to fight the Centre's gazette notification banning the sale and purchase of cattle for slaughter.
The court said there is no constitutional violation in the order issued by the Ministry of Environment, Forests and Climate Change which has created an uproar in some states including Kerala.
Hassan said the new law would disrupt the federal structure of the country.
The rules build on legislation passed in several states, most led by Modi's Bharatiya Janata Party, to ban the slaughter of cattle.
Youth Congress activist Sunil, who filed the PIL, withdrew it after the hearing.
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The ban, if implemented, would take a large amount of carabeef (buffalo) and a small amount of beef off the global market.
The Kerala cabinet on Friday asked Governor P. Sathasivam to convene a special session of the state assembly on June 8 chiefly to discuss and debate the new rules by the Centre on cattle trade for slaughter that infringes on the states' rights.
Against this backdrop, union minister Venkaiah Naidu has said the Centre is examining the issues.
He said the seller and buyer both have to ensure that the cattle is not being bought or sold across the country's livestock markets market for slaughter purposes.
Earlier, Kerala Chief Minister Pinarayi Vijayan urged the Chief Ministers of other states to raise their voices against restrictions imposed on cattle trade, while saying that the Centre's "anti-democratic" notification is an attempt to usurp the state governments' powers in the guise of rules under a Central Act.