Silvio Mattacchione & Co.


Subscribe to Our FREE Newsletter!

Preferred Format:
First Name:

Pigeon Books from Silvio Mattacchione & Co.

All material Copyright © 1996-2014 by Silvio Mattacchione & Co. unless otherwise noted.

Inbreeding Math

This is the mathematics behind inbreeding a cock to his daughter and granddaughters. (A=Cock, B=Hen)

This is the mathematics behind inbreeding a cock to his daughter and granddaughters. (A=Cock, B=Hen)


You can calculate the amount of a sire or dam's genetic material in the offspring of an inbred line by using the following equation:

(1 - 0.5n) x 100 = x%

n = number of generations a bird has been used as a sire or dam to produce the offspring
x = percentage of genetic material from the sire or dam in the offspring

(This equation only works if the sire or dam in question has been used in every generation.)

For Example

"St. Thomas" (NL-83-8391269) was first bred with "Platina" (AU-91-1322) to produce several offspring, including daughter, "Oxygen" (CU-93-00392). He was then bred with this daughter to produce CU-95-BVR-4013 and CU-95-BVR-4014.

"St. Thomas" (NL-83-8391269) x "Platina" (AU-91-1322)

"St. Thomas" (NL-83-8391269) was used in two generations as a sire in this line, so n=2. The equation then reads:

(1 - (0.5)2) x 100 = 75%

Therefore, the amount of St. Thomas' genetic material in his offspring, CU-95-BVR-4013 and CU-95-BVR-4014, is 75% and the amount of genetic material from "Platina" (AU-91-1322) is 25%.

Racing Pigeons Section Contents

Ashdon Farms

Background on Silvio Mattacchione, his pigeons, his loft, and inbreeding program.


A group of articles and editorials addressing various aspects of the sport of pigeon racing and the history of Silvio's line of Spanjaards/Janssens pigeons.

Pigeon Books

Buy fantastic pigeon books online! Selections include The Will to Prepare by Robert Kinney, Rotondo on Racing Pigeons by Joseph Rotondo, and The Pigeon Guide by Dr. Jon Esposito and Shannon Hiatt.

Pigeons For Sale

Some of Silvio Mattacchione's own winning stock is for sale.

Pigeon Consulting

Sivio Mattacchione offers a wide range of racing pigeon consulting services and consults with owners as far away as Australia, Mexico, Taiwan, The Philippines and the United States. Each consultation is tailored specifically to meet the client's needs, and is conducted in as thorough a manner as possible.

Charity Events

Good causes supported by Silvio and the racing pigeon and parrot communities.


Clever pigeon pictures constructed of keyboard strokes by artist Jerry Downs.

Pigeon Links

Links to other racing pigeon sites including those of clubs, products, and information resources.

An easy way to navigate a series of pigeon web sites!

Contact Us

Silvio's e-mail, mail, phone, and fax contact information.


Return to Top