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Titolo:
Quantitative and molecular genetic influences on properties of beef: a review
Autore:
Burrow, HM; Moore, SS; Johnston, DJ; Barendse, W; Bindon, BM;
Indirizzi:
CSIRO, Cooperat Res Ctr Cattle & Beef Qual, Rockhampton MC, Qld 4702, Australia CSIRO Rockhampton Qld Australia 4702 Rockhampton MC, Qld 4702, Australia Univ Queensland, CSIRO, Gehrmann Labs, Brisbane, Qld 4072, Australia Univ Queensland Brisbane Qld Australia 4072 Brisbane, Qld 4072, Australia Univ New England, NSW Agr, Anim Genet & Breeding Unit, Armidale, NSW 2351,Australia Univ New England Armidale NSW Australia 2351 Armidale, NSW 2351,Australia Univ New England, CJ Hawkins Homestead, Armidale, NSW 2351, Australia UnivNew England Armidale NSW Australia 2351 rmidale, NSW 2351, Australia
Titolo Testata:
AUSTRALIAN JOURNAL OF EXPERIMENTAL AGRICULTURE
fascicolo: 7, volume: 41, anno: 2001,
pagine: 893 - 919
SICI:
0816-1089(2001)41:7<893:QAMGIO>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
MARKER-ASSISTED SELECTION; UTILIZING LINKAGE DISEQUILIBRIUM; JAPANESE BLACK CATTLE; MEAT-QUALITY TRAITS; BOS-INDICUS CATTLE; CARCASS TRAITS; LONGISSIMUS MUSCLE; BIOLOGICAL TYPES; CYTOPLASMIC INHERITANCE; COMPOSITE POPULATIONS;
Keywords:
carcass and beef quality; crossbreeding; within-breed selection; genetic markers;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
122
Recensione:
Indirizzi per estratti:
Indirizzo: Burrow, HM CSIRO, Cooperat Res Ctr Cattle & Beef Qual, Box 5545, Rockhampton MC, Qld 4702, Australia CSIRO Box 5545 Rockhampton Qld Australia 4702 d 4702, Australia
Citazione:
H.M. Burrow et al., "Quantitative and molecular genetic influences on properties of beef: a review", AUST J EX A, 41(7), 2001, pp. 893-919

Abstract

The scientific literature is reviewed to identify quantitative and molecular genetic influences on quantity and quality of beef. Genetic variation between breeds is of similar magnitude to genetic variation within breeds formany economically important traits. Differences between breeds are significant and large for most carcass and beef quality attributes, including beeftenderness, although differences for sensory juiciness and flavour are of little practical importance. For traits such as beef tenderness, between-breed differences may be more easily exploited than within-breed differences,because exceptional breeds are easier to identify than exceptional animals. Effects of heterosis on carcass and beef quality attributes are relatively small (3% or less), with most effects mediated through heterotic effects on weight. Carcass composition traits (e.g. carcass weight, fat thickness and marbling) are moderately to highly heritable. Most estimates of retail beef yield percentage are highly heritable, offering good potential for within-breed selection for the trait, although a moderate to strong antagonistic relationship exists between yield and marbling. This relationship needs to be considered in within-breed selection programs for yield percentage. Early estimates of heritability of objective measures of beef tenderness (Warner Bratzler shear force values) indicated tenderness was moderately to highly heritable. Recent estimates using larger numbers of carcasses and more discriminatory methods of analysis indicate that beef tenderness is lowly heritable in Bos taurus breeds and moderately heritable in Bos indicus and Bos indicus-derived breeds. Within breeds, measures of 24-h calpastatin activity are genetically strongly correlated with shear force values but are more heritable. However, phenotypic correlations between shear force values and 24-h calpastatin activities are low. There are also inconsistencies in relationships between these measurements across breeds. Low correlations between tenderness in different muscles, low to moderate heritabilities and inconsistent variation within- and between-breeds for traits such as 24-h calpastatin activity suggest that genetic improvement in beef tenderness may be difficult. The possibility exists that significant mitochondrial genetic effects occur for some carcass and beef quality attributes. A major gene for muscular hypertrophy in cattle significantly affects carcass and beef quality characteristics. Genome-wide screening of DNA markers indicates a number of putative Quantitative Trait Loci (QTL) associated with carcass and meat quality characteristics. Published data for these QTL are summarised. Strategies to combine quantitative and molecular genetic information to maximise genetic progress are discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 18:39:18