Is grit necessary if the chickens are running around free?
That just depends on how serious one is about developing a high quality gizzard in the birds.
Grit is all about sharp edges, insolubility, and correct size for the right age.
1. The sharp edged grit is more efficient in grinding up the feed in the short time it stays in the gizzard.
2. Insoluble grit does not dissolve or get the edges rounded/softened by the acid in the gizzard.
It stays the correct size.
3. The proper size for the age of the poultry helps the grit stay in the gizzard longer.
All three of these factors are found uniformly in granite grit. So we know the birds are getting a
uniform diet of the 3 factors they need to best break up their food in the gizzard. Now I am sure they
can also find these factors in pebbles and small grit they find in the fields and by-ways. The question
is, are they finding grit with
all these factors or just one or 2 per piece. It does make a difference.
So when we feed grit, we are looking to the future. To production time when egg production will be
higher and when broiler weight will be heavier because we fed the grit during finishing time.
In fact, the commercial poultry grit industry in America actually
developed around a specific
need
the poultry growers had. They found that proper grit feeding improved their bottom line. The
growers were looking for a better way to feed grit and the grit industry was born. Gran-I-Grit
started making poultry grit in 1935.
Best,
Karen
Just an extra:
http://poultrykeeper.com/general-chickens/types-of-poultry-grit
and more:
https://www.backyardchickens.com/products/gran-i-grit-insoluable-crushed-granite/reviews/8836
Click on the blue hot link : "
Gran-I-Grit insoluable crushed granite " underneath
the pic and scroll way down the page for detailed instructions on how much and
when to feed different sizes of this grit.