Go to Top Go to Bottom
Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.19.0642    [Accepted] 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, Iran
2Department of Animal Science, College of Agriculture, University of Birjand, Birjand, Iran
3Jihad Agricultural Organization, Mashhad, Iran
Correspondence:  Fateme Bahri Binabaj, Tel: +98-9120915879, Fax: +98-1733268882, Email: fatemebahri_b@yahoo.com
Received: 11 August 2019   • Revised: 4 October 2019   • Accepted: 4 February 2020
Abstract
Objective
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.
Methods
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 (BW), weaning weight (WW), six-month weight (6MW), nine-month weight (9MW) and yearling weight (YW). The contribution, inbreeding and co-ancestry (CFC) 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.
Results
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.
Conclusion
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
TOOLS
METRICS Graph View
  • 0 Crossref
  •  0 Scopus
  • 106 View
  • 10 Download
Related articles


Editorial Office
Asian-Australasian Association of Animal Production Societies(AAAP)
Room 708 Sammo Sporex, 23, Sillim-ro 59-gil, Gwanak-gu, Seoul 08776, Korea   
TEL : +82-2-888-6558    FAX : +82-2-888-6559   
E-mail : jongkha@hotmail.com               

Copyright © 2020 by Asian-Australasian Journal of Animal Sciences. All rights reserved.

Close layer
prev next