Some poultry abattoirs inject Brine into the chickens in the process between slaughter and packing. This reportedly serves to elongate shelf life of the chickens. But it also increases the size of the chickens as well as the weight.
In the Name of Allah, the Most Gracious, the Most Merciful.
Brine injection in poultry carcass is an industrial practice to enhance the taste, tenderize the meat and prolong the shelf life.
However, since injecting brine solution increases the weight of the chicken carcass, this increase in weight should be clearly mentioned on the packaging. This is also a legal requirement as well. Concealing this increase in weight due to the brine solution may lead to deception.
And Allah Ta’āla Knows Best
Mawlana Faisal bin Abdul Hameed
Student, Darul Iftaa
Checked and Approved by,
Mufti Ebrahim Desai.
 http://www.pmg.org.za/report/20110322-department-agriculture-department-trade-industry-poultry-brine-inject (accessed 21st Sept. 2011)