The bottom line is that large amounts of chicken heart, seven or more per day, could provide more than the recommended nutrients for your cat. (feline-nutrition.org)
It is made with chicken heart, liver, eggs and chicken bones with the vital amount of meat which provides the vital source of animal proteins. (itday.com)
We feed 80 % muscle meat (including chicken hearts), 10 % bones, 10 % organ meat (5 % of which should be liver). (keepthetailwagging.com)