Genetic trends over 20 years of selection in the three synthetic Arcotts, Suffolk and Finnish Landrace sheep breeds. 1. Early growth traits

Shrestha, J. N. B.; Peters, H. F.; Heaney, D. P.; Vleck, L.D. Van

doi:10.4141/cjas96-004

Cited by 20 publications

(9 citation statements)

References 13 publications

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“…The genetic trend for birth weight was irregular and not significant (the mean close to zero) and was in accordance with the findings of Hassani et al (2010) in Baluchi sheep (0.7 g/year), Bahreini and Aslaminejad (2010) in Kermani sheep (1 g/year), and Zishiri et al (2010) in Ile de France sheep(1 g/ year). However, estimates reported by Shrestha et al (1996) in Suffolk sheep(13 g/year) and Dorostkar et al (2011) in Moghani sheep (5.5 g/ year) were higher than the estimates of the present study. Maternal effects had a significant effect on birth weight.…”

Section: Body Weight Traitscontrasting

confidence: 56%

“…The genetic trends for 3 months weight (34 g/year) and 6 months weight (28 g/year), were greater than the ones observed by Dorostkar et al (2011) in Moghani sheep (5.3 and 5.2 g/year, respectively), and Lotfi et al (2011) in Arman sheep (7 and 8 g/year, respectively); however they were lower than that ones reported by Hassani et al (2010) in Baluchi sheep (55 and 72 g/year, respectively), Shaat et al (2004) in Rahmani sheep (92 and 135 g/year, respectively), and Bahreini and Aslaminejad (2010) in Kermani sheep (82 and 76 g/year, respectively). The estimation of direct genetic trend for yearling weight (24 g/year) was lower than those reported by Hassani et al (2010) in Baluchi sheep (88 g/year) and Dorostkar et al (2011) in Moghani sheep(84 g/year), while it was in accordance with the findings of Shrestha et al (1996) in Suffolk sheep (23 g/year) and it was higher than the ones reported by Bahreini and Aslaminejad (2010) in Kermani sheep (16 g/year). The higher genetic trends for 3 month and 6 month weights, than other body weights, might be due to the relatively higher additive genetic variance in those traits.…”

Section: Body Weight Traitscontrasting

confidence: 40%

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Study of the environmental, genetic and phenotypic trends for pelt traits and body weight traits in Zandi sheep

Khojastehkey

Aslaminejad

2013

Journal of Applied Animal Research

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In this study, the data of body weights and pelt records of Zandi sheep kept at the Khojir national park breeding station of Iran were used to estimate phenotypic, genetic and environmental trends for birth weight (BW), 3 months weight (3MW), 6 months weight (6MW), yearling weight (YW), curl type (CT), pattern score (PS) and Luster (Lu) of pelt. Data were analyzed for each trait using derivative-free REML procedures under a univariate animal model. Genetic, phenotypic and environmental trends were estimated by regression of the estimated mean of breeding values, phenotypic mean and difference between estimated mean of breeding values and phenotypic mean on birth year, respectively. The average additive direct genetic trends for BW, 3MW, 6MW, YW were 0.00190.001, 0.03490.004, 0.02890.007 and 0.02490.004 g/year and for CT, PS and Lu were 0.0069.002, 0.00190.002 and 0.00290.004, respectively. Although selection for body weight traits was effective and significant genetic improvements were obtained, limited genetic improvement in the pelt traits were detected.

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Section: Body Weight Traitscontrasting

confidence: 56%

Section: Body Weight Traitscontrasting

confidence: 40%

Study of the environmental, genetic and phenotypic trends for pelt traits and body weight traits in Zandi sheep

Khojastehkey

Aslaminejad

2013

Journal of Applied Animal Research

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“…The positive development of BV for live weight at 12 weeks of age (from 1.07 kg in 1998 to 3.07 kg in 2003) in the fat-tailed Menz sheep breed was noted by Gizaw et al (2007). The same tendency of BV for growth performance traits at different ages has been described in various sheep breeds by Shrestha et al (1996), Shaat et al (2004), Mokhtari and Rashidi (2010), and Gholizadeh and GhafouriKesbi (2015). A genetic progress was also clear in the evaluated BVs of the Suffolk population in the present study.…”

Section: Discussionmentioning

confidence: 57%

“…Previous studies have described the genetic trends of different sheep populations; improvements in the sheep population genotypes was noted based on the increase in positive BVs during the observation period (Shrestha et al 1996;Hanford et al 2003;Gizaw et al 2007). Simm et al (2002) compared a selected Suffolk population with a control population in an attempt to describe the response to selection for lean growth.…”

mentioning

confidence: 99%

Response to selection of a breeding program for Suffolk sheep in the Czech Republic

Ptáček¹,

Ducháček²,

Schmidová³

et al. 2018

CZECH J ANIM SCI

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Ptáček M., Ducháček J., Schmidová J., Stádník L. (2018): Response to selection of a breeding program for Suffolk sheep in the Czech Republic. Czech J. Anim. Sci., 63, 305-312.Lamb growth performance traits in relation to parental breeding values (BVs) for these traits were evaluated in a purebred Suffolk sheep population in the Czech Republic. The research lasted over 8 years and included 24 886 lambs. Four relevant parental BVs were observed: BV predicted for lamb live weight direct effect (BVLW-DE), BV predicted for lamb live weight maternal effect (BVLW-ME), BV predicted for lamb musculus longissimus lumborum et thoracis depth (BV-MLLT), and BV predicted for lamb backfat thickness (BV-BT). The lamb live weight (LW; kg), musculus longissimus lumborum et thoracis depth (MLLT; mm), and backfat thickness (BT; mm) were assessed at 100 days of age. A dataset was created using the most current parental BVs for each year (2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014) and subsequent growth traits of their lambs in the next season (2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015). Linear regressions showed an increased tendency when one point in dam BVs was associated with an increase in lamb LW (0.393 kg; P < 0.01 in BVLW-DE and 0.090 kg; P < 0.05 in BVLW-ME), MLLT (0.340 mm; P < 0.01 in BV-MLLT), or BT (0.243; P < 0.01 mm in BV-BT). Lower (but significant -P < 0.01) values on linear regression were detected for sire BVs, when 0.135 kg of LW, 0.217 mm of MLLT, and 0.214 mm of BT corresponded to 1-point increases of BVLW-DE, BV-MLLT, or BV-BT. This was confirmed by ANOVA evaluation, especially for LW and MLLT traits. Maximal differences (P < 0.05) in lamb LW were 1.84 kg or 0.88 kg regarding to dam or sire BVLW-DE groups. Similarly, the difference (P < 0.05) in lamb MLLT reached 0.82 mm in dam BV-MLLT, while 0.57 mm was detected in sire BV-MLLT groups. These results have practical implications for the objectives of selection schemes used in the Suffolk sheep population in the Czech Republic.

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“…The success of a breeding program can be assessed by examining the actual change in breeding value expressed as a proportion of expected theoretical change of the breeding value mean for the trait under selection (Jurado et al 1994). Estimates of genetic trends for body weight of different sheep breeds have been reported by several authors (Shrestha et al 1996;Shaat et al 2004;Hanford et al 2005;Gizaw et al 2007;Bosso et al 2007;Mokhtari and Rashidi 2010). Such estimates are scarce for Moghani breed.…”

Section: Introductionmentioning

confidence: 98%

Bayesian estimates of genetic changes for body weight traits of Moghani sheep using Gibbs sampling

Hossein-Zadeh

2011

Trop Anim Health Prod

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The objective of the present study was to estimate genetic changes of body weight at different ages in Moghani sheep. Traits included were birth weight (BW, n = 4,208), 3-month weight (3MW, n = 4,175), 6-month weight (6MW, n = 3,138), 9-month weight (9MW, n = 2,244), and yearling weight (YW, n = 1,342). Data and pedigree information used in this study were collected at the Breeding Station of Moghani sheep during 1989-2005. The analysis was carried out for five traits, using the MTGSAM program. Breeding values of individual animals were obtained from a multivariate animal model analysis and genetic trends were obtained by regressing the means of predicted breeding values on year of birth for each trait. Direct genetic trends were positive and significant (P < 0.05) for BW, 3MW, 6MW, 9MW, and YW and were 1.63, 69.20, 79.38, 66.83, and 110.22 g/year, respectively. Also, maternal genetic trends for BW, 3MW, 6MW, 9MW, and YW were positive and significant (P < 0.05) and were 2.36, 49.18, 37.33, 17.73, and 9.67 g/year, respectively. The results showed that improvement of body weights of Moghani sheep seems feasible in selection programs.

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Genetic trends over 20 years of selection in the three synthetic Arcotts, Suffolk and Finnish Landrace sheep breeds. 1. Early growth traits

Cited by 20 publications

References 13 publications

Study of the environmental, genetic and phenotypic trends for pelt traits and body weight traits in Zandi sheep

Study of the environmental, genetic and phenotypic trends for pelt traits and body weight traits in Zandi sheep

Response to selection of a breeding program for Suffolk sheep in the Czech Republic

Bayesian estimates of genetic changes for body weight traits of Moghani sheep using Gibbs sampling

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