Population structure and inbreeding effects on body weight traits of Guilan sheep in Iran

Eteqadi, Bahareh; Hossein-Zadeh, Navid Ghavi; Shadparvar, Abdol Ahad

doi:10.1016/j.smallrumres.2014.03.003

Cited by 32 publications

(56 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Pedrosa et al (2010) found a significant inbreeding depression for BW as 3.4 g per 10% increase in Santa Inês lamb inbreeding. In addition, the findings by Ghavi Hossein-Zadeh (2012), Mokhtari et al (2014), and Eteqadi et al (2014) were not similar to the findings of the present study. Ghavi Hossein-Zadeh (2012) reported that BW was affected by inbreeding of lambs being -9 g (p<0.001).…”

Section: Discussioncontrasting

confidence: 99%

“…The reduction due to inbreeding for 6MW as 76.3 g found in the present study was higher than that observed by Eteqadi et al (2014). Considering lamb sex, there were significant regression coefficients on male and female lamb inbreeding for change of 1% inbreeding by -92.9 and 83.9 g, respectively.…”

Section: Discussioncontrasting

confidence: 75%

“…However, by increasing the inbreeding level, WW of Hissardale lambs insignificantly increased (Akhtar et al, 2000). Also, considering the sex of lamb and litter size, Eteqadi et al (2014) reported a significant decline of 30.1, 28.9, 27.1, and 75.7 g in WW of male, female, single, and twin-born Guilan lambs per 1% increase in lamb inbreeding, respectively.…”

Section: Discussionmentioning

confidence: 92%

“…The inbreeding depression of BW obtained as -7 g (p<0.05) using 6,082 Iran-Black sheep records analyzed by Mokhtari et al (2014). Eteqadi et al (2014) obtained inbreeding depression of BW as -5.5 g using 14,549 Guilan lamb records over an 18-year period.…”

Section: Discussionmentioning

confidence: 99%

“…Inbreeding response is not the same for all animals. There is a wide range of variation in the literature regarding the estimation of inbreeding depression of growth traits (Mirza et al, 1999;Norberg and Sørensen, 2007;Van Wyk et al, 2009;Pedrosa et al, 2010;Ghavi Hossein-Zadeh, 2012;Eteqadi et al, 2014;Mokhtari et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Inbreeding depression on growth traits of Iranian Lori sheep

Yeganehpur

Roshanfekr

Fayazi

et al. 2016

Rev Colomb Cienc Pecu

View full text Add to dashboard Cite

SummaryBackground: 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 00.20, 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.

show abstract

Section: Discussioncontrasting

confidence: 99%

Section: Discussioncontrasting

confidence: 75%

Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Inbreeding depression on growth traits of Iranian Lori sheep

Yeganehpur

Roshanfekr

Fayazi

et al. 2016

Rev Colomb Cienc Pecu

View full text Add to dashboard Cite

show abstract

Inbreeding effects on reproductive traits in Iranian Guilan sheep

Eteqadi

Hossein-Zadeh

Shadparvar

2015

Trop Anim Health Prod

View full text Add to dashboard Cite

The objective of the present study was to evaluate the effects of inbreeding on reproductive traits in Guilan sheep. Traits included were litter size at birth (LSB), litter size at weaning (LSW), litter mean weight per lamb born (LMWLB), litter mean weight per lamb weaned (LMWLW), total litter weight at birth (TLWB), and total litter weight at weaning (TLWW). Data and pedigree information used in this study were collected during 1994 to 2011 by the Agriculture Organization of Guilan Province in the north of Iran. Data were comprised of 14,534 records of lambs from 136 sires and 2021 dams. All the animals were grouped into three classes according to the inbreeding coefficients (F) obtained by their pedigree: the first class included non-inbred animals (F = 0%), and the second and third classes included inbred animals (0 < F ≤ 5% and F > 5%, respectively). The regression coefficients of LSB, LSW, LMWLB, LMWLW, TLWB, and TLWW on lamb inbreeding for a change of 1% in inbreeding were estimated to be 0.035 ± 0.0038 (P < 0.001), -0.029 ± 0.0077 (P < 0.05), -0.333 ± 0.009 (P < 0.001), -2.21 ± 0.071 (P < 0.001), -0.254 ± 0.013 (P < 0.001), and -1.95 ± 0.093 (P < 0.001), respectively. Effect of inbreeding on reproductive traits in Guilan sheep was very pronounced in the flock. The utilization of a program for planned mating system, in the present flock, suggested keeping the level of inbreeding under control and avoiding appearance of its detrimental effects.

show abstract