Seramas are classed by weight:
Class A or Micro - are the smallest and any under 13 ounces are in this group...they don't reproduce well from what I have read.
Class B - under a pound (16 ounces)
Class C - under 19 ounces
I finally got a scale and put my roosters on it to see where mine fell in the classes.

This is my oldest rooster and he is a class C by weight

This is one of my rooster from him and he is a class B bird...but he is not a year old so he will probably end up more than a pound when mature.

Cogburn was the heaviest of my three roosters and he is 17.6 ounces.
Class A or Micro - are the smallest and any under 13 ounces are in this group...they don't reproduce well from what I have read.
Class B - under a pound (16 ounces)
Class C - under 19 ounces
I finally got a scale and put my roosters on it to see where mine fell in the classes.
This is my oldest rooster and he is a class C by weight
This is one of my rooster from him and he is a class B bird...but he is not a year old so he will probably end up more than a pound when mature.
Cogburn was the heaviest of my three roosters and he is 17.6 ounces.
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