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About Inbreeding Coefficients (COIs)
Two common breeding practices are inbreeding and outcrossing. Inbreeding is practiced industry-wide with Nigerian goats. It is not unusual to find animals with Coefficients of Inbreeding (COIs)* as high as 30%-60%. Tracking COIs can be challenging in Nigerians as ADGA Genetics is often missing pedigree data for the breed and thus reports inaccurately low COIs on individual animals.
Inbreeding coefficients are a measure of the increased percentage in homozygous (same) gene pairs in an individual in comparison to the breed average. A goat that is inbred is "more likely to have identical gene pairs, so is more likely to express undesirable characteristics from recessive genes, leading to a decline in performance called inbreeding depression" (Shepard, "Practical Genetics for Dairy Goat Breeding," http://certification.goats.langston.edu/login/index.php, p. 293.).
Depending on the source, the recommended ceiling should be somewhere between 5% and 12.5% after all generations are considered.
