The age of the bird, their diet, the time of year, and the heath of the bird all play into egg size.
In the spring when all the new growth is out and birds are newly off their winter molt is when eggs size should be the largest. At 13 months old I am guessing that they probably laid all throught he winter. It that correct? How long are they into their laying cycle?
At that age they haven't seen their largest eggs yet. IF they take a molt this winter you should see bigger eggs next spring that you were getting earlier this year.
The BOSS.may be the reason egg size is going down. That is something that I always relate more to feather quality that to egg size though. So I would guess that is not it. The level of protein in the diet is what I usually think of when it comes to influencing eggs size. Hen on 20% protein laying mash would be expected to have larger eggs than those on 15% protein.
If they are getting a lot of free range or being fed wild greens I wouldn't won't worry about them. I usually see our biggest eggs in March and they taper off after that. Take good car of them and I bet next March you see some monster size eggs if you were getting Jumbo eggs from them in their first year of laying.
In the spring when all the new growth is out and birds are newly off their winter molt is when eggs size should be the largest. At 13 months old I am guessing that they probably laid all throught he winter. It that correct? How long are they into their laying cycle?
At that age they haven't seen their largest eggs yet. IF they take a molt this winter you should see bigger eggs next spring that you were getting earlier this year.
The BOSS.may be the reason egg size is going down. That is something that I always relate more to feather quality that to egg size though. So I would guess that is not it. The level of protein in the diet is what I usually think of when it comes to influencing eggs size. Hen on 20% protein laying mash would be expected to have larger eggs than those on 15% protein.
If they are getting a lot of free range or being fed wild greens I wouldn't won't worry about them. I usually see our biggest eggs in March and they taper off after that. Take good car of them and I bet next March you see some monster size eggs if you were getting Jumbo eggs from them in their first year of laying.