Hi Mohammad Gamal
The following is paragraph from UK Regulation 2014 regarding meat product composition.
Meat content declaration
Any ingredient mentioned in the name of the food, emphasised on the food, or generally associated with the food must be given a 'quantitative ingredient declaration' (QUID), which states how much of the ingredient is in the food in the form of a percentage of the entire product. If specifying the species or cut of the meat (for example 'Pork sausages') you will need to declare how much is present.
QUID calculations are done at the mixing bowl stage of production and can be calculated as follows: weight of meat divided by total weight of ingredients multiplied by 100.
The easiest way to give a QUID is in the ingredients list (for example, 'Ingredients: Pork (42%)') but you may also give it in the name of the food (for example, 'Pork sausage - contains 42% pork').
Any fat and connective tissue over the permitted limits is not meat and you must account for this in your calculations.
Where multiple types of meat have been used you must declare the content of each. for more information please vist the following link