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Estimation of inbreeding coefficient in Corriedale sheep

The present study was undertaken to the estimate inbreeding coefficient in Corriedale sheep under different agro-climatic conditions of Jammu and Kashmir. The pedigree file of 6,874 records of Corriedale sheep, maintained at Mountain Research Centre for Sheep & Goat (MRCSG), F.V.Sc & A.H, SKUAST-K Shuhama, for a period of 49 years (1969- 2017) was used to calculate inbreeding coefficients. The individual inbreeding coefficients were measured by Wright’s formula and was computed from the pedigree containing 6,874 animals using CFC software package and expressed as percentage. Average inbreeding coefficient (F) of the lambs generally increased over the periods. The mean inbreeding coefficient (F), proportion of population inbred (per cent), for Corriedale sheep were 18.3 and 43.3 respectively. During initial periods, inbreeding coefficient was 9.67 and it increased upto 27.7 during the last period. During the initial period (P1, (1969-1975) about 12.2% were inbred and gradually increased upto 80.19% during the last period (P7, (2011- 2017). The coefficient of inbreeding ranged from 0 to 37.5 in inbred lambs. It was concluded that by avoiding the mating between related individuals and by the introduction of breeding rams, unnecessary and undesirable increase of inbreeding in the flock can be minimized. | Original Research Article https doi.org 10.20546 ijcmas.2019.804.242 Estimation of Inbreeding Coefficient in Corriedale Sheep NTiicriif NAhi1 NT A Cionoi1 c Shana 1 Slaftw A ohm1 RnLliori1 Mir hohir1 Nusrat Nabi N. A. Ganai S. Shanaz Saieer . AalaiH Saba Bu Lhari iviir Shabir Ruksana Majid1 Ambreen Hamdani1 Najimaana Wani2 and Heena Jalal3 Division of Animal Genetics and Breeding SKUAST-K India 2Division of veterinary public health and epidemology SKUAST-K India 3Division of Livestock Production and Technology SKUAST-K India Corresponding author ABSTRACT Keywords Inbreeding coefficient Corriedale sheep Article Info Accepted 15 March 2019 Available Online 10 April 2019 The present study was undertaken to the estimate inbreeding coefficient in Corriedale sheep under different agro-climatic conditions of Jammu and Kashmir. The pedigree file of 6 874 records of Corriedale sheep maintained at Mountain Research Centre for Sheep Goat MRCSG F.V.Sc A.H SKUAST-K Shuhama for a period of 49 years 19692017 was used to calculate inbreeding coefficients. The individual inbreeding coefficients were measured by Wright s formula and was computed from the pedigree containing 6 874 animals using CFC software package and expressed as percentage. Average inbreeding coefficient F of the lambs generally increased over the periods. The mean inbreeding coefficient F proportion of population inbred per cent for Corriedale sheep were 18.3 and 43.3 respectively. During initial periods inbreeding coefficient was 9.67 and it increased upto 27.7 during the last period. During the initial period P1 1969-1975 about 12.2 were inbred and gradually increased upto 80.19 during the last period P7 20112017 . The coefficient of inbreeding ranged from 0 to 37.5 in inbred lambs. It was concluded that by avoiding the mating between related individuals and by the introduction of breeding rams unnecessary and undesirable increase of inbreeding in the flock can be minimized. Introduction The assessment of .