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Anim Biosci > Volume 34(4); 2021 > Article
Animal Breeding and Genetics
Animal Bioscience 2021;34(4): 506-515.
DOI: https://doi.org/10.5713/ajas.19.0642    Published online February 25, 2020.
Inbreeding affected differently on observations distribution of a growth trait in Iranian Baluchi sheep
Fateme Bahri Binabaj1,*  , Seyyed Homayoun Farhangfar2  , Majid Jafari3 
1Department of Animal Science, College of Agriculture and Natural Resources, Gonbad Kavous University, Gonbad Kavous, PO Box 163, Iran
2Department of Animal Science, College of Agriculture, University of Birjand, Birjand 9717434765, Iran
3Jihad Agricultural Organization, Mashhad, PO Box 91735-484, Iran
Correspondence:  Fateme Bahri Binabaj, Tel: +98-1733261769, Fax: +98-1733268882, Email: f_bahri_b@gonbad.ac.ir
Received: 11 August 2019   • Revised: 4 October 2019   • Accepted: 4 February 2020
Initial consequence of inbreeding is inbreeding depression which impairs the performance of growth, production, health, fertility and survival traits in different animal breeds and populations. The effect of inbreeding on economically important traits should be accurately estimated. The effect of inbreeding depression on growth traits in sheep has been reported in many breeds. Based on this, the main objective of the present research was to evaluate the impact of inbreeding on some growth traits of Iranian Baluchi sheep breed using quantile regression model.
Pedigree and growth traits records of 13,633 Baluchi lambs born from year 1989 to 2016 were used in this research. The traits were birth weight, weaning weight, six-month weight, nine-month weight, and yearling weight. The contribution, inbreeding and co-ancestry software was used to calculate the pedigree statistics and inbreeding coefficients. To evaluate the impact of inbreeding on different quantiles of each growth trait, a series of quantile regression models were fitted using QUANTREG procedure of SAS software. Annual trend of inbreeding was also estimated fitting a simple linear regression of lamb’s inbreeding coefficient on the birth year.
Average inbreeding coefficient of the population was 1.63 percent. Annual increase rate of inbreeding of the flock was 0.11 percent (p<0.01). The results showed that the effect of inbreeding in different quantiles of growth traits is not similar. Also, inbreeding affected differently on growth traits, considering lambs’ sex and type of birth.
Quantile regression revealed that inbreeding did not have similar effect on different quantiles of growth traits in Iranian Baluchi lambs indicating that at a given age and inbreeding coefficient, lambs with different sex and birth type were not equally influenced by inbreeding.
Keywords: Baluchi Sheep Breed; Non-genetic Factors; Growth Trait; Inbreeding; Quantile Regression
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