Effect of inbreeding and individual increase in inbreeding on growth in Nilagiri and Sandyno breeds of sheep
- 15 March 2016
- journal article
- research article
- Published by Cambridge University Press (CUP) in Animal Genetic Resources/Ressources génétiques animales/Recursos genéticos animales
- Vol. 58, 63-71
- https://doi.org/10.1017/s2078633615000338
Abstract
Summary: Individual increase in inbreeding coefficients (ΔFi) has been recommended as an alternate measure of inbreeding. It can account for the differences in pedigree knowledge of individual animals and avoids overestimation due to increased number of known generations. The effect of inbreeding (F) and equivalent inbreeding (EF) calculated fromΔFi, on growth traits were studied in Nilagiri and Sandyno flocks of sheep. The study was based on data maintained at the Sheep Breeding Research Station, Sandynallah. The pedigree information and equivalent number of generations were less in Sandyno compared with Nilagiri sheep. The average F and EF for the Nilagiri population were 2.17 and 2.44, respectively and the corresponding values for Sandyno sheep were 0.83 and 0.84, respectively. The trend of inbreeding over years in both the populations indicated that EF was higher during earlier generations when pedigree information was shallow. Among the significant effects of inbreeding, the depression in growth per 1 percent increase in inbreeding ranged from 0.04 kg in weaning weight to 0.10 kg in yearling weight. In general, more traits were affected by inbreeding in Nilagiri sheep, in which greater regression of growth traits was noticed with F compared with EF. Higher values of EF than F in earlier generations in both the populations indicate that EF avoided the potential overestimation of inbreeding coefficient during recent generations. In the Sandyno population, the magnitude of depression noticed among growth traits with significant effects of inbreeding was higher. The differences in response to F and EF noticed in the two populations and possible causes for the trait wise differences in response to F and EF are appropriately discussed.Keywords
This publication has 23 references indexed in Scilit:
- Population structure and effect of inbreeding on lamb growth in Bharat Merino sheepSmall Ruminant Research, 2013
- Pedigree analysis and inbreeding depression on growth traits in Brazilian Marchigiana and Bonsmara breeds1Journal of Animal Science, 2012
- Population structure and inbreeding effects on growth traits of Santa Inês sheep in BrazilSmall Ruminant Research, 2010
- Improving the estimation of realized effective population sizes in farm animalsJournal of Animal Breeding and Genetics, 2009
- Cellular regulation of bovine intramuscular adipose tissue development and composition12Journal of Animal Science, 2009
- Analysis of founder-specific inbreeding depression on birth weight in Ripollesa lambs1Journal of Animal Science, 2009
- Inbreeding trend and inbreeding depression in the Danish populations of Texel, Shropshire, and Oxford Down1Journal of Animal Science, 2007
- Inbreeding in populations with incomplete pedigreesJournal of Animal Breeding and Genetics, 1999
- Analyses of lamb weight and ewe litter size in various lines of Spanish Merino sheepSmall Ruminant Research, 1998
- Effects of inbreeding on reproduction, weights and survival of Sardi and Beni Guil sheepJournal of Animal Breeding and Genetics, 1997