I've looked at this book before but find it
darn hard to read, especially when they turn a table sideways
Effect of Environment on Nutrient Requirements of Domestic Animals (1981)
What it looks like to me is that the literature isn't altogether conclusive . . . oh, you don't want to hear that
.
Anywho . . . Apparently Jones and Barnett found that at 4°C to 5°C (about 40°F) and without upping the feed's calorie content, laying hens ate 26.8% more feed than they did at 18°C to 25°C (65°F to 77°F).
That sorta, kinda reinforces what that Danish free-ranging study showed but the research was in a controlled environment. It looks to me like feed consumption goes up by about one-third as the ambient temperature approaches freezing.
I don't suppose we can expect any studies on how much the birds are eating as temperatures drop much
colder than 40°F. But, you and I both know - it's gotta go up.
I fed my birds only their commercial feed yesterday (average temperature 35°F) and they consumed right at 5 ounces of feed each. They are back on the treats and table leftovers along with their feed again today but I'll try this when the temps drop a little more (it is easier to weigh the feed without the bread, veggies, & scratch
).
I'm fairly convinced that they really don't have too much trouble eating enuf to gain adequate calories with
reasonable Winter temperatures. Of course, what that does to the old feed bill is another story
.
Steve