Evaluation of estimated genetic merit for carcass weight in beef cattle: Blood metabolites, carcass measurements, carcass composition and selected non-carcass components

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

doi:10.1016/j.livsci.2009.06.003

Cited by 19 publications

(34 citation statements)

References 46 publications

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“…The absence of a difference between the breeds in ribs joint bone proportion also agrees with previous findings (Keane and Drennan, 2008;Keane and Moloney, 2009), whereas the higher m. longissimus, other muscle and total muscle proportions, together with the lower fat proportion of BB compared with AA, have been documented previously (Keane and Drennan, 2008;Keane and Moloney, 2009;Campion et al, 2009b). It is noteworthy that even though all other muscle proportions were higher for BB, muscle trim proportion tended (P 5 0.08) to be higher for AA.…”

Section: Carcass Traitssupporting

confidence: 91%

“…The 13 g/kg greater hind quarter proportion for BB over AA compares with previous values of 18 g/kg (Keane and Drennan, 2008), 17 g/kg (Keane and Drennan, 2009), 20 g/kg (Keane and Moloney, 2009) and 17 g/kg (Campion et al, 2009b).…”

Section: Carcass Traitssupporting

confidence: 63%

“…Context of study This study was comparable with those of Campion et al (2009a and2009b) insofar as it evaluated the effects of sire estimated genetic merit for carcass weight on a range of production and carcass traits. However, it differs from those of Campion et al (2009a and2009b) in that it did not include dairy strains, carcasses were not completely dissected and m. longissimus chemical composition was measured.…”

Section: Discussionmentioning

confidence: 99%

“…However, it differs from those of Campion et al (2009a and2009b) in that it did not include dairy strains, carcasses were not completely dissected and m. longissimus chemical composition was measured. Twelve of the 20 sires used in this study were common to the studies of Campion et al (2009aand 2009b.…”

Section: Discussionmentioning

confidence: 99%

“…In a precursor to this study, Campion et al (2009a and2009b) compared progeny from Holstein-Friesian dairy cows and early Aberdeen Angus (AA) and late Belgian Blue (BB) maturing beef breed sires of high and low EPD CWT . Pure-bred Friesians and Holsteins were also included.…”

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

Animal

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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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