For the number of meals in a year, there’s 1095 (365 * 3), not including forth meals, snacks, etc. For 100 pounds, let’s convert it to ounces, so 1600 oz.
Assuming 8 oz (half pound) for a single meal meal. Normal weight of a single chicken breast is 6 ounces, but there are some factors I’m not sure about (is bone weight included, raw or cooked weight, etc), so rounding up to 8 to cover those.
That works out to 200 meals with 8 oz chicken to reach the 100 pounds goal. This means not even a quarter of the usual 1095 meals in a year, but rather only around 18% is chicken based. I was a bit skeptical as well, but this seems easier to reach than I thought.
This in some ways justifies all those pounds of meat from hunting I accrued in playing Oregon Trail lol.