Evaluation of estimated genetic merit for carcass weight in beef cattle: Live weights, feed intake, body measurements, skeletal and muscular scores, and carcass characteristics

Campion, Benjamin Betey; Keane, M. G.; Kenny, David A.; Berry, D.P.

doi:10.1016/j.livsci.2009.06.004

Cited by 40 publications

(87 citation statements)

References 39 publications

(56 reference statements)

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“…Clarke et al (2009) reported that beef weanlings and post-weanlings were heavier than dairy breeds and this was also reflected in greater muscularity scores in the animals. Better kill-out percentage, greater muscularity, better carcass conformation and greater live-weight were also Factors associated with cattle selling price associated with beef breeds (Keane, 2003;Campion et al, 2009;Clarke et al, 2009) relative to their dairy contemporaries. The higher prices across all maturity categories in this study for the Charolais and Belgian Blue animals is consistent with the superior carcass traits and live-weights that have been reported for these two breeds (Alberti et al, 2008;Campion et al, 2009;Clarke et al, 2009).…”

Section: Seasonal Effectsmentioning

confidence: 97%

“…Better kill-out percentage, greater muscularity, better carcass conformation and greater live-weight were also Factors associated with cattle selling price associated with beef breeds (Keane, 2003;Campion et al, 2009;Clarke et al, 2009) relative to their dairy contemporaries. The higher prices across all maturity categories in this study for the Charolais and Belgian Blue animals is consistent with the superior carcass traits and live-weights that have been reported for these two breeds (Alberti et al, 2008;Campion et al, 2009;Clarke et al, 2009). As many of the female dairy animals that are purchased through the marts are likely to be retained as replacements, this was reflected in the premium prices paid for dairy females compared with their male counterparts, similar to the findings of Dal Zotto et al (2009).…”

Section: Seasonal Effectsmentioning

confidence: 97%

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Factors associated with selling price of cattle at livestock marts

Hugh

Fahey

Evans

et al. 2010

Animal

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The objective of this study was to determine the factors associated with selling price of animals at livestock marts around Ireland. Data consisted of four distinct maturity categories: calves (2 to 84 days of age, n 5 53 838); weanlings (6 to 12 months of age, n 5 19 972); post-weanlings (12 to 36 months of age, n 5 93 081) and cows (.30 months to 12 years of age, n 5 94 839); sold through livestock marts between 2000 and 2008. Factors associated with animal price were determined within each maturity category separately using mixed models; random effects were mart, date of sale nested within mart, and herd of origin nested within year of sale. Mean selling price was h157, h580, h655 and h592 for calves, weanlings, post-weanlings and cows, respectively. The greatest prices were paid for singleton crossbred male calves, weanlings and post-weanlings from older dams. With the exception of the Aberdeen Angus, beef breeds and their crosses consistently received higher prices than their dairy counterparts across all four maturity categories; increased proportion of Belgian Blue and Charolais was associated with greater prices compared with other beef breeds. When live-weight was included in the multiple regression models the association between price and all factors regressed toward zero but most factors remained associated with price. The highest price was recorded in the spring months for calves, post-weanlings and cows, and in the autumn months for weanlings. Results from this study may be used to help farmers make more informed management decisions, as well as provide information for bio-economic models for evaluating alternative production systems or estimating economic values.

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Section: Seasonal Effectsmentioning

confidence: 97%

Section: Seasonal Effectsmentioning

confidence: 97%

Factors associated with selling price of cattle at livestock marts

Hugh

Fahey

Evans

et al. 2010

Animal

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“…Skeletal scores (9-point scale) were recorded at three locations and muscular scores (15-point scale) were recorded at four locations. These scores were aggregated to give one overall skeletal and one overall muscular score per animal (Campion et al, 2009a). All animals were turned out to pasture together on 25 March for a second grazing season of 209 days.…”

Section: Animal Sourcementioning

confidence: 99%

“…Carcass weights for all commercially slaughtered cattle (including culled cows) are captured in a central database and are used in the ICBF genetic evaluation programme as the measure of lifetime growth rate. Breeding value for carcass weight is derived using a multi-trait animal model and expressed as the expected progeny difference for carcass weight (EPD CWT ), estimated as a deviation from a common base carcass weight for Holstein-Friesian steers (Campion et al, 2009a). Age at slaughter, among other factors, is adjusted for in the model as a fixed effect.…”

Section: Introductionmentioning

confidence: 99%

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Effects of genetic merit for carcass weight, breed type and slaughter weight on performance and carcass traits of beef × dairy steers

Keane

Dunne

Kenny

et al. 2011

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Crossbreeding of Holstein-Friesian dairy cows with both early maturing (e.g. Aberdeen Angus (AA)) and late maturing (e.g. Belgian Blue (BB)) beef breeds is commonly practised. In Ireland, genetic merit for growth rate of beef sires is expressed as expected progeny difference for carcass weight (EPD CWT ). The objective of this study was to compare the progeny of Holstein-Friesian cows, sired by AA and BB bulls of low (L) and high (H) EPD CWT for performance and carcass traits. A total of 118 spring-born male progeny from 20 (9 AA and 11 BB) sires (8 L and 12 H) were managed together from shortly after birth to about 19 months of age. They were then assigned to one of two mean slaughter weights (560 kg (light) or 620 kg (heavy)). Following slaughter, carcasses were graded for conformation class and fat class, the 6th to 10th ribs joint was dissected as an indicator of carcass composition, and samples of subcutaneous fat and musculus longissimus were subjected to Hunterlab colour measurements. A sample of m. longissimus was also chemically analysed. Slaughter and carcass weights per day of age for AAL, AAH, BBL and BBH were 747, 789, 790 and 805 (s.e. 10.5) g, and 385, 411, 427 and 443 (s.e. 4.4) g, respectively. Corresponding carcass weight, kill-out proportion, carcass conformation class (scale 1 to 5) and carcass fat class (scale 1 to 5) values were 289, 312, 320 and 333 (s.e. 4.0) kg, 516, 522, 542 and 553 (s.e. 3.5) g/kg, 2.5, 2.4, 3.0 and 3.1 (s.e. 0.10), and 3.4, 3.5, 2.9 and 2.8 (s.e. 0.11). There were few breed type 3 genetic merit interactions. Delaying slaughter date increased slaughter weight, carcass weight and all measures of fatness. It also reduced the proportion of carcass weight in the hind quarter and the proportions of bone and muscle in the ribs joint. None of these effects accompanied the increase in carcass weight due to higher EPD CWT . It is concluded that BB have superior production traits to AA. Selection of sires for higher EPD CWT increases growth rate, kill-out proportion and carcass weight of progeny with little effect on carcass or muscle traits. The extra carcass weight due to higher EPD CWT is more valuable commercially than a comparable carcass weight increment from a delay in slaughter date because it comprises a higher proportion of muscle.

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Analysis of multiple polymorphisms in the bovine neuropeptide Y5 receptor gene and structural modelling of the encoded protein

et al. 2011

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The neuropeptide Y 5 receptor (NPY5R) plays an important role in the regulation of appetite and feeding behaviour in mammals by modulating the effect of the neurotransmitter neuropeptide Y. As single nucleotide polymorphism (SNP) variation in the bovine NPY5R gene is likely to influence the expression and/or function of this gene, the objectives of this study were to identify SNPs in the bovine NPY5R gene and to predict their functional role in the expression and physico-chemical characteristics of the protein product. Nineteen novel SNPs were identified in a 2.1 kb genomic region of the NPY5R gene in a total of 419 beef cattle from 13 Bos taurus breeds and eight Bos indicus animals. Four of these SNPs were non-synonymous (Met → Ile, Leu → Phe, Pro → Leu, Arg → Stop codon), while 10 were synonymous. Of particular interest was one non-synonymous SNP (c.1090C>T) that introduced a stop codon in the third intracellular loop of the NPY5R molecule. This stop codon is predicted to create a truncated NPY5R molecule with different physico-chemical properties compared to the native NPY5R protein. A further four SNPs were located in the 5' untranslated region (UTR) and one in the 3'UTR. Two of the 5'UTR SNPs affected putative transcription factor binding sites (GATA binding factor and snRNA-activating protein complex). In conclusion, regulatory and functional SNPs were identified in the bovine NPY5R gene. These include SNPs which potentially modify transcription factor binding sites as well as SNPs that cause amino acid changes and premature termination of the NPY5R protein. Such polymorphisms are likely to play vital physiological roles in the neuropeptide Y mediated appetite, feed intake and energy homeostasis in cattle.

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Evaluation of estimated genetic merit for carcass weight in beef cattle: Live weights, feed intake, body measurements, skeletal and muscular scores, and carcass characteristics

Cited by 40 publications

References 39 publications

Factors associated with selling price of cattle at livestock marts

Factors associated with selling price of cattle at livestock marts

Effects of genetic merit for carcass weight, breed type and slaughter weight on performance and carcass traits of beef × dairy steers

Analysis of multiple polymorphisms in the bovine neuropeptide Y5 receptor gene and structural modelling of the encoded protein

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