Abstract
A survey was carried out in Kinantan Bagombak Breeding Farm (KBBF) in Solok City-Indonesia to estimate inbreeding rate on Kokok balenggek chicken (KBC). Estimation of inbreeding rate in a small and limited population of local chickens is very important to prevent inbreeding depression. KBC is a poultry genetic resource known as song fowl from West Sumatera Province, Indonesia. This research was aimed to calculate flock composition, effective population size (Ne) and inbreeding rate (ΔF) in KBC under ex-situ population. Census was the main research method. The results showed that total number of KBC at KBBF was 528 heads. Chicken flock composition of KBC was chick (31.63%), chicken grower (27.65%) and adult chicken (40.72%). Number of breeding males (Nm) was 54 heads and females (Nf) was 161 heads. Male and female ratio (Nm/Nf) was 1:3 (33.54%). Effective population size (Ne) was 162 heads. The rate of inbreeding (ΔF) calculated for the indigenous KBC flock considering the existing flock size and management practice was 0.0031 (0.31%) indicating that the population is not at the risk of extinction. It is concluded that inbreeding depression in KBC population at KBBF was not occurred.
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