Inbreeding depression on growth traits of Iranian Lori sheep

Summary Background: Lori sheep is an Iranian heavy breed known for its superiority in terms of disease resistance, adaptability to the mountainous west of the country and meat production potential. Objective: to estimate and compare the inbreeding coefficient in Lori sheep, and its impact on gro...

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Main Authors: Zahra Yeganehpur, Hedayatollah Roshanfekr, Jamal Fayazi, Mir Hossein Beyranvand
Format: Article
Language:English
Published: Universidad de Antioquia
Series:Revista Colombiana de Ciencias Pecuarias
Subjects:
Online Access:http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-06902016000400264&lng=en&tlng=en
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spelling doaj-8ad2f55731c44cca81af1e153dd431862020-11-24T21:47:07ZengUniversidad de AntioquiaRevista Colombiana de Ciencias Pecuarias0120-069029426427310.17533/udea.rccp.v29n4a03S0120-06902016000400264Inbreeding depression on growth traits of Iranian Lori sheepZahra YeganehpurHedayatollah RoshanfekrJamal FayaziMir Hossein BeyranvandSummary Background: Lori sheep is an Iranian heavy breed known for its superiority in terms of disease resistance, adaptability to the mountainous west of the country and meat production potential. Objective: to estimate and compare the inbreeding coefficient in Lori sheep, and its impact on growth traits. Methods: data and pedigree information were collected in Lorestan Agricultural and Natural Resources Research Center, west of Iran, during 2001-2010. Traits included were birth weight (BW), weaning weight (WW), 6-month weight (6MW) and 9-month weight (9MW). The inbreeding coefficient estimation was carried out through the CFC software, and quantification of individual inbreeding regression on the characteristics was conducted using The Wombat software. All animals were divided into four categories according to the inbreeding coefficients obtained from their pedigree: the first category included non-inbred animals (F = 0%); and the second, third, and fourth categories included inbred animals as 0<F ≤ 0.10, 0.10<F ≤ 0.20, and F>0.20, respectively. Results: inbreeding coefficients were 0.69% and 2.24% in the entire population and inbred population, respectively. Inbreeding regression for BW, WW, 6 MW and 9 MW were estimated as +4.5, -10.3, -76.3, and -77.4 g, respectively. The inbreeding trend was positive and significant for the whole population (0.215; p<0.001), but not significant for the inbred population. Conclusion: these results confirm a low level of inbreeding and suggest that direct controlled mating could be an appropriate method to avoid inbreeding depression.http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-06902016000400264&lng=en&tlng=eninbreeding categoriesinbreeding effectsmating systempedigree statistics
collection DOAJ
language English
format Article
sources DOAJ
author Zahra Yeganehpur
Hedayatollah Roshanfekr
Jamal Fayazi
Mir Hossein Beyranvand
spellingShingle Zahra Yeganehpur
Hedayatollah Roshanfekr
Jamal Fayazi
Mir Hossein Beyranvand
Inbreeding depression on growth traits of Iranian Lori sheep
Revista Colombiana de Ciencias Pecuarias
inbreeding categories
inbreeding effects
mating system
pedigree statistics
author_facet Zahra Yeganehpur
Hedayatollah Roshanfekr
Jamal Fayazi
Mir Hossein Beyranvand
author_sort Zahra Yeganehpur
title Inbreeding depression on growth traits of Iranian Lori sheep
title_short Inbreeding depression on growth traits of Iranian Lori sheep
title_full Inbreeding depression on growth traits of Iranian Lori sheep
title_fullStr Inbreeding depression on growth traits of Iranian Lori sheep
title_full_unstemmed Inbreeding depression on growth traits of Iranian Lori sheep
title_sort inbreeding depression on growth traits of iranian lori sheep
publisher Universidad de Antioquia
series Revista Colombiana de Ciencias Pecuarias
issn 0120-0690
description Summary Background: Lori sheep is an Iranian heavy breed known for its superiority in terms of disease resistance, adaptability to the mountainous west of the country and meat production potential. Objective: to estimate and compare the inbreeding coefficient in Lori sheep, and its impact on growth traits. Methods: data and pedigree information were collected in Lorestan Agricultural and Natural Resources Research Center, west of Iran, during 2001-2010. Traits included were birth weight (BW), weaning weight (WW), 6-month weight (6MW) and 9-month weight (9MW). The inbreeding coefficient estimation was carried out through the CFC software, and quantification of individual inbreeding regression on the characteristics was conducted using The Wombat software. All animals were divided into four categories according to the inbreeding coefficients obtained from their pedigree: the first category included non-inbred animals (F = 0%); and the second, third, and fourth categories included inbred animals as 0<F ≤ 0.10, 0.10<F ≤ 0.20, and F>0.20, respectively. Results: inbreeding coefficients were 0.69% and 2.24% in the entire population and inbred population, respectively. Inbreeding regression for BW, WW, 6 MW and 9 MW were estimated as +4.5, -10.3, -76.3, and -77.4 g, respectively. The inbreeding trend was positive and significant for the whole population (0.215; p<0.001), but not significant for the inbred population. Conclusion: these results confirm a low level of inbreeding and suggest that direct controlled mating could be an appropriate method to avoid inbreeding depression.
topic inbreeding categories
inbreeding effects
mating system
pedigree statistics
url http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-06902016000400264&lng=en&tlng=en
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AT jamalfayazi inbreedingdepressionongrowthtraitsofiranianlorisheep
AT mirhosseinbeyranvand inbreedingdepressionongrowthtraitsofiranianlorisheep
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