Having so many farm animals at the farm winter can be tough. Not only hard on Farmer Pat who does all the chores but on the animals too. Calf coats are placed on the calves in the barn. The sheep...well, they are covered in a wool coat that anyone would envy. But I often wondered and was concerned for the goats. What kept them warm? You can see a winter coat of hair that looks thicker than what you see during the summer, but it never looked thick enough to keep them warm during the harsh WI winters....until I read
Meghan Leonard blog.
I found her story so interesting I reposted here for you to learn as I did, that goats eat for heating! Enjoy.
As
the nighttime temperatures remain low throughout much of the country, I
have to pause and compare my winter wardrobe to my goats’. I go
all-out for morning chores: insulated coat, thermal underclothes, denim
jeans, t-shirt, sweatshirt, long scarf, open-finger gloves and knit hat.
My goats meet me at the gate dressed in their fluffiest hair, and…wait…
just fluffy hair! And I still have the nerve to complain about the
cold!
Goats are able to generate amazing amounts of heat
to withstand the cold, due to the amazing design of their digestive
system. They have four stomachs, which is not exactly breaking news.
But the process in the rumen, the largest of the stomachs, is
fascinating and understanding the process can help us to keep our
caprine friends warm all winter.
It is a basic tenet of
goat nutrition that they need plenty of roughage – mostly hay in cold
weather. The hay has cell walls made of cellulose, and it’s the
fermentation and breakdown of that cellulose that provides the fuel for
the goat’s internal furnace. When hay is put into the manger, the goats
eat the hay quickly, but don’t really chew it well enough to turn it
into heat. This is where the amazing adult goat rumen comes into play,
since as the goat finishes eating; the real “hot” work begins.
As
hay enters the goat’s rumen, it settles in layers. The bottom layer is
the softened hay from yesterday (and the grain from today). The middle
layer is today’s hay, and at the top is gas. The gas is created by
fermentation from tiny microbes that live in the goat’s rumen. These
microbes start anaerobically digesting the cellulose from hay in the
bottom and middle layers, which releases gas, plus begins generating
heat for the goat to stay warm.
Now, we all know the goat
can’t keep the gas, or it will bloat. Nature handles this with the
contractions of the rumen, which causes a bolus of softened hay (cud) to
come back up the goat’s esophagus via a burp, and into the mouth for
re-chewing. When the “cud chewing” begins, the gas is also released.
According to a study by Colorado State University, up to 5 liters of gas
are released by a goat in an hour of cud chewing!
Once
the goat chews the cud and re-swallows it, the microbes continue working
on the cellulose again. These microbes are delicately balanced in the
rumen, which is why all feed changes need to be done slowly, so microbe
development can keep pace. Most of the work is actually completed by
the microbes, and without them the goat can’t keep warm. The heat from
the rumen’s fermentation can actually be compared to the breakdown in a
compost pile and the high heat generated from it! This is why many goat
keepers advocate an endless supply of hay in the winter, since without
adequate roughage the goat’s internal furnace will not function
correctly.
Once again, this noble creature shows us humans
a thing or two about efficiency. Now if only I could get all the
comfort food I eat in the winter to work as an internal furnace!
Meghan Leonard
Meghan
Leonard is a veterinary medical technology student, leading to vet
school. She lives and learns at her barnyard in southcentral PA, where
books and practical goat experience combine.
Visit Meghan's blog at:
https://hoeggerfarmyard.com/eating-for-heating-how-a-goats-rumen-works/
-Ride a Pony
