+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Genetic parameters for carcass and meat quality traits and their relationships to liveweight and wool production in hogget Merino rams



Genetic parameters for carcass and meat quality traits and their relationships to liveweight and wool production in hogget Merino rams



Journal of Animal Breeding and Genetics 125(3): 205-215



Genetic parameters for carcass and meat quality traits of about 18-month-old Merino rams (n = 5870), the progeny of 543 sires from three research resource flocks, were estimated. The estimates of heritability for hot carcass weight (HCW) and the various fat and muscle dimension measurements were moderate and ranged from 0.20 to 0.37. The brightness of meat (colour L*, 0.18 +/- 0.03 standard error) and meat pH (0.22 +/- 0.03) also had moderate estimates of heritability, although meat relative redness (colour a*, 0.10 +/- 0.03) and relative yellowness (colour b*, 0.10 +/- 0.03) were lower. Heritability estimates for live weights were moderate and ranged from 0.29 to 0.41 with significant permanent maternal environmental effects (0.13 to 0.10). The heritability estimates for the hogget wool traits were moderate to high and ranged from 0.27 to 0.60. The ultrasound measurements of fat depth (FATUS) and eye muscle depth (EMDUS) on live animals were highly genetically correlated with the corresponding carcass measurements (0.69 +/- 0.09 FATC and 0.77 +/- 0.07 EMD). Carcass tissue depth (FATGR) had moderate to low genetic correlations with carcass muscle measurements [0.18 +/- 0.10 EMD and 0.05 +/- 0.10 eye muscle area (EMA)], while those with FATC were negative. The genetic correlation between EMD and eye muscle width (EMW) was 0.41 +/- 0.08, while EMA was highly correlated with EMD (0.89 +/- 0.0) and EMW (0.78 +/- 0.04). The genetic correlations for muscle colour with muscle measurements were moderately negative, while those with fat measurements were close to zero. Meat pH was positively correlated with muscle measurements (0.14 to 0.17) and negatively correlated with fat measurements (-0.06 to -0.18). EMDUS also showed a similar pattern of correlations to EMD with meat quality indicator traits, although FATUS had positive correlations with these traits which were generally smaller than their standard error. The genetic correlations among the meat colour traits were high and positive while those with meat pH were high and negative, which were all in the favourable direction. Generally, phenotypic correlations were similar or slightly lower than the corresponding genetic correlations. There were generally small to moderate negative genetic correlations between clean fleece weight (CFW) and carcass fat traits while those with muscle traits were close to zero. As the Merino is already a relatively lean breed, this implies that particular attention should be given to this relationship in Merino breeding programmes to prevent the reduction of fat reserves as a correlated response to selection for increased fleece weight. The ultrasound scan traits generally showed a similar pattern to the corresponding carcass fat and muscle traits. There was a small unfavourable genetic correlation between CFW and meat pH (0.19 +/- 0.07).

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 022706806

Download citation: RISBibTeXText

PMID: 18479272

DOI: 10.1111/j.1439-0388.2007.00711.x


Related references

Genetic relationships between carcass quality and wool production traits in Australian Merino rams. 50 years of DNA: Proceedings of the Fifteenth Conference, Association for the Advancement of Animal Breeding and Genetics, Melbourne, Australia, 7-11 July 2003: 330-333, 2003

Genetic parameters for meat quality and carcass traits and their correlation with wool traits in Australian Merino sheep. Australian Journal of Agricultural Research 54(7): 715-722, 2003

Heritability estimates and genetic and phenotypic correlations of lamb production parameters with hogget liveweight and fleece traits in Western Australian Merino sheep. Australian Journal of Agricultural Research 53(3): 281-286, 2002

Genetic parameters for liveweight, wool and worm resistance traits in multi-breed Australian meat sheep. 2. Genetic relationships between traits. Animal Production Science 56(9): 1449-1453, 2016

Genetic evaluation of production traits between and within flocks of merino sheep i. hogget fleece weights body weight and wool quality. Australian Journal of Agricultural Research 40(2): 433-444, 1989

Genetic parameters for yearling wool production, wool quality and bodyweight traits in fine wool Merino sheep. Australian Journal of Experimental Agriculture 48(9): 1168, 2008

Genetic parameters for ultrasound scan and wool traits at yearling and hogget age in Merino sheep. Application of new genetic technologies to animal breeding Proceedings of the 16th Conference of the Association for the Advancement of Animal Breeding and Genetics, Noosa Lakes, Queensland, Australia, 25-28 September, 2005: 32-35, 2005

Genetic parameters for lean meat yield, meat quality, reproduction and feed efficiency traits for Australian pigs: 2. Genetic relationships between production, carcase and meat quality traits. Livestock Production Science 65(3): 249-259, 2000

Genetic parameters for bodyweight, wool, and disease resistance and reproduction traits in Merino sheep. 4. Genetic relationships between and within wool traits. Animal Production Science 49(4): 289-296, 2009

Genetic parameters for wool traits, live weight, and ultrasound carcass traits in Merino sheep. Journal of Animal Science 95(5): 1879-1891, 2018

Genetic parameters for bodyweight, wool, and disease resistance and reproduction traits in Merino sheep. 3. Genetic relationships between ultrasound scan traits and other traits. Animal Production Science 49(4): 283-288, 2009

Direct and maternal genetic (co)variances for hogget liveweight and fleece traits in Western Australian Merino sheep. Australian Journal of Agricultural Research 53(3): 271-279, 2002

Genetic variances for liveweight and fleece traits in Merino, Dohne Merino and South African Meat Merino sheep. Australian Journal of Experimental Agriculture 41(2): 145-153, 2001

Genetic parameters for lean meat yield, meat quality, reproduction and feed efficiency traits for Australian pigs: 3. Genetic parameters for reproduction traits and genetic correlations with production, carcase and meat quality traits. Livestock Production Science 65(3): 261-270, 2000

Performance of crossbred progeny of Trangie Fertility Merino and Booroola Merino rams and Poll Dorset ewes: 2. Reproductive activity, liveweight and wool production of ewe lambs. Australian Journal of Experimental Agriculture 35(8): 1075-1082, 1995