Research Institute for Physiology of Animal Reproduction, Bhunikey (Pattoki),
District Kasur
Abstract
Pedigree, breeding and performance records of the purebred Jersey herd maintained at the Livestock Experiment
Station, Bhunikey (Pattoki) Kasur during the period 1982-2000 were utilized for
the present study. The coefficient of inbreeding of each animal was calculated
using Derivative Free Restricted Maximum Likelihood (DFREML) set of computer
programme. Analysis of pedigree records of 602 animals having identification for
the extent ofinbreeding revealed that only 13 animals (2.16%) were
inbred with an average inbreeding coefficient of 24%, the highest level being
25%. Overall average inbreeding coefficient was found to be only 0.0043%. None
of the 36 sires used was found inbred. One of the main reasons for low level of
inbreeding in the present herd was comparatively shorter time period and the
incomplete pedigrees especially for animals born in earlier years. It was
concluded that level of inbreeding might increase in future, therefore precise
pedigree recording and planned mating strategies be adopted to avoid any adverse
effect of inbreeding on performance traits.