we have standard composition in our laboratory and the animals looks good and grow well, we just gave them: 60 % cornflour for starch, 20 % fish meal for protein, 10 % wheat flour or bran flour  for fibers, 7 % oil seed cake, 2 % bone meal and 1 % salt for 1 Kg.

Below is the composition of our pellets for rats. However we do not prepare this ourselves, but buy it from a commercial producer.

Crude Protein : 23 % Crude Fat : 3.0% Crude Fiber : 7.0% Acid Insoluble Ash 8% Calcium : 1-2.5 % Phosphorus : 0.9% Sodium : 0.5-1% Moisture: 12%

Ingredients 
Corn, Soybean pulp, Sunflower seed meal, Shorts, Bonquality flour, Alfalfa pellets, Molases, Meat and bone meal, Poultry meal, Sepiolite, inorganic DCP, Marble dust, vitamins, minerals

Thank  you Mireille Kameni and Sakire Pogun 

Please look at the following below links which may help you in your analysis:

https://www.ncbi.nlm.nih.gov/books/NBK231927/pdf/Bookshelf_NBK231927.pdf

https://www.biomed.cas.cz/physiolres/pdf/60/60_317.pdf

https://www.aaalac.org/accreditation/RefResources/Gen_FELASA_nutrition.pdf

Thanks