Seems like if you rounded up to integer values of animals, the maintenance of the animals could be even cheaper, especially with the need for a freezer obviated. For integers >= 2, the animals may even display non-zero growth rates.
Chickens, the most cost, effort, and space effective food animals need about .1lb/day of grain, in addition to forage and kitchen scraps. For that, you'll get eggs and occasionally, chicks. FWIW, I've had chickens for 5 years, and the first chick hatched yesterday. If you've got young hens, you might get .75 egg/day/hen. As they age, that goes down. All in costs are probably O($0.50)/egg.
Laying hens will start laying after 4-6 months, then be productive for another year, and start to tail off for the next year or two. They're 3-4lb birds before cleaning.
On the gripping hand, there is the excess rooster problem, commonly solved with coq au vin.