Indirect selective breeding method of high-collagen meat geese

An indirect selective breeding method of high-collagen meat geese, comprising:

• (1) measuring first lengths, first widths, and first heights of first knobs of first young geese, determining a first collagen content in a first leg muscle of the first young geese, and performing a linear fitting on a size, of the first length×the first width×the first height of the first knobs and the first collagen content in first leg muscle to obtain a linear equation between the size and the first collagen content in the first leg muscle:
• y=0.017x+0.026, wherein y is collagen content, x is the size of the knobs, that is the first length >the first width >the first height of the first knobs;
• (2) rearing first goslings to second young geese;
• (3) measuring lengths, widths, and heights of second knobs of second young geese, and conducting a calculation according to the linear equation obtained in step (1) to give a second collagen content in a second leg muscle of the second young geese;
• (4) sorting the second young geese in a descending order according to the second collagen content and selecting male geese and female geese with the second collagen content ranked a top 50% as breeding geese to form a family line;
• (5) after the female geese in step (4) lay eggs, hatching the eggs into second goslings;
• and
• (6) repeating steps (2)-(5) for a selective breeding over generations to obtain the high-collagen meat geese.