ANALYSIS OF INBREEDING IN SOME ANGLO NUBIAN DAIRY GOAT FARMS IN THE PHILIPPINES

Abstract

Average inbreeding and co-ancestry coefficients were determined for 172 Anglo Nubian does born from 21 sires and 161 dams based on pedigree information using the tabular method of computing coefficients of relationships. The milking goats born between 1996 and 2012 produced 570 lactation records gathered from 2000 to 2016. Average inbreeding coefficient among males, among females, and among all individuals was 0.000 (0.00%), 0.0011 (0.11%) and 0.0010 (0.10%), respectively. Average coefficient among 172 does with lactation records was 0.0014 (0.14%). The rate of inbreeding based on effective population size is 0.0065 (0.65%) per generation, equivalent to a buck-doe ratio of 1:11.1 by natural mating. Average coefficient of co-ancestry among males, among females, between males and females, and among all individuals was 0.000 (0.00%), 0.0185 (1.85%), 0.0109 (1.09%), and 0.0172 (1.72%), respectively. The results of the correlation and regression analysis showed no significant relationship (P>0.05) between individual inbreeding coefficient with total milk yield, lactation length, daily milk yield, number of lactations, age at first kidding and kidding interval. No inbreeding depression in these traits for the local Anglo Nubian herds was reported in this study.