Genetic parameters for terminal sires estimated using data of progeny from Border Leicester × Merino ewes

Kenney, PA; Goddard, Michael E.; Thatcher, LP

doi:10.1071/ar9950703

Cited by 4 publications

(9 citation statements)

References 9 publications

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“…These studies also reported estimates close to zero for post-weaning weight with FATGR and FATC (Ingham et al 2007) and scanning weight with FATC, but not FATGR (0.33) (Greeff et al 2008). Kenney et al (1995) reported a genetic correlation of 0.65 between hind-leg bone weight and weaning weight, which is consistent with the estimate (0.76) in the present study.…”

Section: Discussionsupporting

confidence: 91%

“…For the genetic correlations involving the carcass muscle dimensions, the stronger genetic correlations (greater than~0.3 in size) were for EMW with WWT, WTUS and FATUS, for EMD with EMDUS and FATUS and for EMA with FATUS. The preliminary estimates of these genetic relationships were similar to the estimates reported by Kenney et al (1995), Ingham et al (2007) and Greeff et al (2008). The high positive genetic correlations of EMDUS with EMD and EMA were very similar to estimates reported by Greeff et al (2008) (0.82 and 0.63, respectively).…”

Section: Discussionsupporting

confidence: 88%

“…The liveweights had strong positive genetic correlations with HCWT, which was in agreement with the estimates of Kenney et al (1995), Ingham et al (2007) and Greeff et al (2008) for correlations involving weaning weight (0.86, 0.74 and 0.64, respectively) and of Ingham et al (2007) for post-weaning weight (0.80) and Greeff et al (2008) for weight at ultrasound scanning (0.89). The ultrasound measurement of muscle in our data was strongly correlated with DP in the present study, whereas Greeff et al (2008) reported positive genetic correlations with DP (0.47) and HCWT (0.70).…”

Section: Discussionsupporting

confidence: 84%

“…In contrast, our heritability estimate (0.23) for FATC was more similar to that of Greeff et al (2008) (0.20) than the estimate of Ingham et al (2007) (0.44). From detailed measurements of carcasses of crossbred lambs raised under Australian conditions, genetic parameters for a wide range of carcass components have been estimated previously by Kenney et al (1995). Where traits were similar, our estimates for BONE (0.27 v. 0.35), FAT5 (0.18 v. 0.31) and FATLL (0.18 v. 0.30) tended to be lower than the estimates of Kenney et al (1995).…”

Section: Discussionmentioning

confidence: 64%

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Preliminary estimates of genetic parameters for carcass and meat quality traits in Australian sheep

et al. 2010

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Using performance from progeny born in 2007 and 2008 generated by the Information Nucleus program of the Cooperative Research Centre for Sheep Industry Innovation, preliminary estimates of heritability were obtained for a range of novel carcass and meat attributes of lamb relevant to consumers, including carcass characteristics, meat quality and nutritional value of lamb. Phenotypic and genetic correlations of live animal traits with carcass composition and meat quality traits were also estimated. The data were from progeny located at eight sites, sired by 183 rams from Merino, maternal and terminal meat breeds and were representative of the Merino, Border Leicester × Merino, Terminal × Merino and Terminal × Border Leicester-Merino production types of the Australian sheep industry. Data were available from 7176 lambs for weaning weight, 6771 lambs for ultrasound scanning and 4110 lambs for slaughter traits. For the novel meat quality traits, generally moderate to high heritability estimates were obtained for meat quality measures of shear force (0.27 aged 1 day, 0.38 aged 5 days), intramuscular fat (0.39), retail meat colour (range of 0.09 to 0.44) and myoglobin content (0.22). The nutritional value traits of omega-3 fatty acids and iron and zinc contents tended to have low to moderate heritabilities (0.11–0.37), although these were based on fewer records. Fresh meat colour traits were of low to moderate heritability (0.06–0.21) whereas measures of meat pH were of low heritability (~0.10). For the carcass traits, estimates of heritability were moderate to high for the various measures of carcass fat (0.18–0.50), muscle weight (0.22–0.35), meat yield (0.24–0.35), carcass muscle dimensions (0.25–0.34) and bone weight (0.27). Results indicate that for most lamb carcass and meat quality traits there is sufficient genetic variation for selection to alter successfully these characteristics. Additionally, most genetic correlations of live animal assessments of bodyweight, muscle and subcutaneous fat with the carcass and meat quality traits were favourable. Appropriate definition of breeding objectives and design of selection indexes should be able to account for the small unfavourable relationships that exist and achieve the desired outcomes from breeding programs.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 88%

Section: Discussionsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 64%

See 2 more Smart Citations

Preliminary estimates of genetic parameters for carcass and meat quality traits in Australian sheep

et al. 2010

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“…Heritability estimates have been moderate to high from the relatively few studies that have estimated genetic variances for carcass dissection traits in sheep, with our results consistent with those earlier estimates. These earlier reports for heritability include 0.36 for WTLL and 0.37 for total lean (Waldron et al, 1992), 0.27 ± 0.06 for meat in 3 primal cuts (Kenney et al, 1995), 0.27 ± 0.11 for lean in the shoulder (Conington et al, 1998), 0.41 for WTLL and 0.24 to 0.31 for lean in various other cuts (Johnson et al, 2006), 0.46 for lean in the carcass (van Heelsum et al, 2006), 0.37 for lean in the loin (Jopson et al, 2009), and 0.32 ± 0.14 for WTLL and 0.24 ± 0.14 for WTTOP (Lorentzen and Vangen, 2012). There have also been other studies reporting heritabilities of 0.2 to 0.5 for lean using video image analysis (Rius-Vilarrasa et al, 2009;Einarsson et al, 2015;Johnson et al, 2015a,b) and computer tomography (CT; Jones et al, 2004;Karamichou et al, 2006;Kvame and Vangen, 2007;Lambe et al, 2008) procedures.…”

Section: Heritabilitymentioning

confidence: 92%

Genetic correlations between wool traits and carcass traits in Merino sheep1

Mortimer

Hatcher

Fogarty

et al. 2017

Journal of Animal Science

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Genetic correlations between 29 wool production and quality traits and 14 whole carcass measures and carcass component traits were estimated from the Information Nucleus of 8 flocks managed across a range of Australian sheep production environments and genetically linked. Wool data were from over 5,000 Merino progeny born over 5 yr, whereas carcass data were from over 1,200 wether progeny of over 176 sires, slaughtered at about 21 kg carcass weight, on average. Wool traits included yearling and adult records for wool weight, fiber diameter, fiber diameter variation, staple strength, scoured color, and visual scores for breech and body wrinkle. Whole carcass measures included HCW, dressing percentage (DP), and various measures of fat depth and eye muscle dimensions. Carcass components were obtained by dissection, and lean meat yield (LMY) was predicted. Heritability estimates for whole carcass measures ranged from 0.12 ± 0.08 to 0.35 ± 0.10 and ranged from 0.17 ± 0.10 to 0.46 ± 0.10 for carcass dissection traits, with no evidence of important genotype × environment interactions. Genetic correlations indicated that selection for increased clean wool weight will result in reduced carcass fat (-0.17 to -0.34) and DP (-0.48 ± 0.15), with little effect on carcass muscle. Selection for lower fiber diameter will reduce HCW (-0.48 ± 0.15) as well as carcass fat (0.14 to 0.27) and muscle (0.21 to 0.50). There were high genetic correlations between live animal measures of fat and muscle depth and the carcass traits (generally greater than 0.5 in size). Selection to increase HCW (and DP) will result in sheep with fewer wrinkles on the body (-0.57 ± 0.10) and barer breeches (-0.74 ± 0.12, favorable), with minor deterioration in scoured wool color (reduced brightness and increased yellowness). Selection for reduced fat will also result in sheep with fewer body wrinkles (-0.42 to -0.79). Increasing LMY in Merinos through selection would result in a large reduction in carcass fat and DP (-0.66 to -0.84), with a smaller increase in carcass muscle and some increase in wool weight and wrinkles. Although no major antagonisms are apparent between the wool and carcass traits, developing selection indexes for dual-purpose wool and meat breeding objectives will require accurate estimates of genetic parameters to ensure that unfavorable relationships are suitably considered. The findings will aid development of dual-purpose wool and meat breeding objectives.

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Genetic parameters for meat quality and carcass traits and their correlation with wool traits in Australian Merino sheep

Fogarty¹,

Safari²,

Taylor³

et al. 2003

Aust. J. Agric. Res.

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Estimates of genetic parameters for carcass traits in Merino sheep are presented, including muscle pH and colour, which are indicators of meat quality. The inclusion of these in the parameter set for genetic evaluation will provide the basis for more accurate estimated breeding values and the design of better breeding programs for improving meat traits in straightbred Merino sheep and crossbred lamb production. Data from 1045, nineteen-month-old Merino rams, the progeny of 125 sires from 3 strains that are representative of the industry, were used. Heritability and genetic correlations were estimated by fitting an animal model using a REML procedure in univariate and multivariate analyses. The traits included fasted pre-slaughter liveweight; dressing %; carcass tissue depth at the GR site (FATGR); fat depth at the C site (FATC); eye muscle depth (EMD), width (EMW), and area (EMA); ultimate pH and colour (L*, a*, b*) of the eye muscle. Multivariate analyses were used to estimate genetic correlations among meat traits and between wool traits (clean wool weight and mean fibre diameter) and selected carcass and meat traits. Estimates of heritability were: liveweight 0.51 (±0.10), dressing % 0.39 (±0.10), FATGR 0.33 (±0.09), FATC 0.20 (±0.08), EMD 0.27 (±0.08), EMW 0.15 (±0.07), EMA 0.23 (±0.08), muscle pH 0.27 (±0.09), and 0.14 (±0.07), 0.02 (±0.06), and 0.04 (±0.06) for the meat colour measurements L*, a*, and b* respectively. There was a favourable genetic correlation between muscle pH and colour L* of –0.56 (±0.23). There were also significant genetic correlations between wool weight and FATGR (–0.34 ± 0.16) and between mean fibre diameter and muscle colour L* (–0.66 ± 0.27). The study indicates that there is genetic variation for carcass traits, including indicators of meat quality, with scope for selection to improve meat production and quality in Merino sheep.

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Genetic parameters for terminal sires estimated using data of progeny from Border Leicester × Merino ewes

Cited by 4 publications

References 9 publications

Preliminary estimates of genetic parameters for carcass and meat quality traits in Australian sheep

Preliminary estimates of genetic parameters for carcass and meat quality traits in Australian sheep

Genetic correlations between wool traits and carcass traits in Merino sheep1

Genetic parameters for meat quality and carcass traits and their correlation with wool traits in Australian Merino sheep

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