Callipyge gene effects on lamb growth, carcass traits, muscle weights and meat characteristics

Abdulkhaliq, Ahed; Meyer, H. H.; Thompson, J. M.; Holmes, Z. A.; Forsberg, Neil E.; Davis, Susannah C.

doi:10.1016/s0921-4488(02)00086-x

Cited by 11 publications

(17 citation statements)

References 2 publications

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“…The F1-RCA lambs grew faster than AW lambs during the fattening trial. However, these results disagree with other researchers [5,6,15-17] who reported no effect of the presence of the CLPG mutation on live weight during the post-weaning period. The highly significant effect of CLPG mutation on AW post-weaning growth rate in this study could be explained by the major effect of this gene on the hindquarters of the Rambouillet beyond the meat-type sheep as indicated in the previous studies [5,6,15,16,18].…”

Section: Discussioncontrasting

confidence: 99%

“…Further, the tenderness of the longissimus muscle was lower in the F1-RCA compared with the AW (19.0 vs. 7.2 kg). The higher shear force measurements in the muscles of the CLPG are consistent with the findings of previous reports [6,17,18,20,21,25]. Koohmaraie et al .…”

Section: Discussionsupporting

confidence: 92%

“…[10] reported that Rambouillet lambs expressing CLPG mutation had heavier hot and cold carcass weights than their normal half-siblings. The weight of shoulders, legs, racks, and loins was significantly higher in the F1-RCA than AW, similar to others [17,18,20,21]. The observed significant difference in the fat tail weight, higher in the AW (Table-2), is an expected result since the Rambouillet sheep breed is thin-tailed and the F1-RCA contains 50% of the Rambouillet genes.…”

Section: Discussionsupporting

confidence: 86%

“…On the other hand, Abdulkhaliq et al . [17] suggested that cookery method may play a major role in the gene effect on meat tenderness. The increased toughness of CLPG meat has been attributed to higher calpastatin activity, which results in decreased protein degradation [6,26].…”

Section: Discussionmentioning

confidence: 99%

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Growth performance and meat characteristics of the first filial Awassi Rambouillet callipyge ram lambs

2019

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Aim: This study was designed to introduce the callipyge (CLPG) and 50% of Rambouillet sheep genes to improve meat quality and quantity of Awassi (AW) sheep. Materials and Methods: The CLPG mutation was introduced into the AW sheep through frozen semen of homozygous Rambouillet rams for the CLPG mutation. Four ram lambs from the first-generation Rambouillet callipyge Awassi (F1-RCA) and five from pure AW were recruited for a fattening trial conducted in individual pens using standard ration, following which ram lambs were slaughtered for carcass and meat evaluation. Results: Final body weight, dry matter intake, average daily gain, and feed conversion ratio were significantly higher in F1-RCA than AW. Hot and cold carcass weights and the other carcass cuts' weights, except for the fat tail, were heavier in F1-RCA than AW. There was no difference in dressing percentage between the two genetic groups (p>0.05). All non-carcass components' weights, except spleen, kidney, and testis, were higher in F1-RCA. Total lean, total bone, and intermuscular fat weight were greater in F1-RCA, but bone-to-lean ratio was lower in F1-RCA when compared with AW (p<0.01). No differences (p>0.05) were observed in all meat quality parameters for muscle longissimus with the exception of pH, redness color, and tenderness that were lower (p<0.05) in F1-RCA than AW. F1-RCA lambs had larger longissimus muscle area (30.9 vs. 16.9 cm2) and less leg fat depth (11.1 vs. 17.4 mm). Conclusion: The implications of this research show the potential of 50% of Rambouillet genes and the CLPG mutation to improve growth and meat characteristics in AW-Rambouillet crosses and can be used further to develop a meat-type AW with improved productivity and muscle mass.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 99%

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Growth performance and meat characteristics of the first filial Awassi Rambouillet callipyge ram lambs

2019

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“…It is independent of, and therefore can be applied in addition to, the positive effects of plane of nutrition on EMD. The finding that the PEMD EBV of the sire had a negative impact on carcass C-site fat depth (beyond that attributable to the PFAT EBV) was unexpected, but studies with Callipyge lambs have shown a lower carcass fat percentage is often associated with the superior muscle development relative to that occurring in other lambs (Jackson et al 1997b;Freking et al 1998;Abdulkhaliq et al 2002). If this joint response of fat and muscle is found to recur in further studies it provides extra incentive for inclusion of PEMD in selection of sires for prime lamb production.…”

Section: Effects Of Nutrition and Genetics On Compositionmentioning

confidence: 99%

Effects of available nutrition and sire breeding values for growth and muscling on the development of crossbred lambs. 1: Growth and carcass characteristics

Hegarty

Shands

Marchant

et al. 2006

Aust. J. Agric. Res.

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Abstract. The growth and development of 387 crossbred lamb progeny from 9 Poll Dorset sires representing muscle (M), control (C), and growth (G) sire-types was studied. Sires were selected on the basis of their LAMBPLAN estimated breeding values (EBVs) for post-weaning growth (PWWT) and depth of loin muscle (PEMD). Lambs were provided with either LOW or HIGH levels of available grazing nutrition from 10 days of age onwards. Liveweight gain (LWG) throughout the study was less on LOW nutrition than on HIGH nutrition, leading to a 9.5 kg lower weaning liveweight (LW) and a 14.9 kg lower final LW in LOW lambs. After adjustment for final LW, HIGH lambs had significantly greater fat depth at the C-site (approximately 40 mm from the midline over the 12th rib) and tissue depth at the GR site (110 mm from the midline over the 12th rib) than did LOW lambs. This effect was consistent across sire-types. Depth of fat at the C-site was positively associated with the EBV of the sire for fat depth. The improvement in pre-weaning LWG, weaning weight, and final weight of lambs resulting from use of sires with a greater PWWT EBV was dependent upon the level of nutrition. This interaction was identified as different slopes (coefficients) for the regression between PWWT and trait for the 2 nutrition levels, indicating that the expression of the sire's genetic potential for growth at these times was significantly moderated by nutrition. The additional depth of lamb loin muscle resulting from use of sires of higher PEMD EBV was consistent across both LOW and HIGH nutrition treatments, with 1 mm of PEMD leading to a 0.6-mm increase in loin depth. Other consequences of sires having a high genetic capacity for loin muscle depth were reduced carcass C-fat depth with increasing sire PEMD and a tendency for conformation score to improve with the PEMD of the sire. The wool-growth response to improved nutrition was less in M lambs than in lambs of other sire-types, suggesting a difference in priority for protein partitioning between muscle and wool in lambs differing in genetic propensity for muscle growth.

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Polymorphism of DLK1 and CLPG gene and their association with phenotypic traits in Chinese cattle

Chen

Niu²,

Wang³

et al. 2010

Mol Biol Rep

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DLK1 and CLPG were located in DLK1-GTL2 imprinted cluster. They all affected muscle growth and meat tenderness. The functional importance of DLK1 and CLPG imply that the variation of the genes could affect the growth traits of animal. PCR-SSCP and sequencing were used to analyze the four loci of DLK1 gene and CLPG gene in 1109 individuals, which belong to eight breeds/species of bovidae, including cattle, buffalo and yak. A synonymous mutation (C451T) was detected in exon 5 of DLK1 in Qinchuan cattle, but didn't change significantly with phenotypic traits. Three genotypes AA, AB and AC of CLPG were identified in Jiaxian cattle. The associations analyst of different genotypes showed that the individuals with genotypes AA and AC had a greater body weight and longer body length than those with genotype AB (P<0.05 and P<0.01, respectively); the AA individuals were different from those AB (P<0.05) in the circumference of cannon bone. No polymorphism was observed in the other populations at other loci. These results were in agreement with the homology analysis: DLK1 and CLPG genes were in a highly conserved.

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Callipyge gene effects on lamb growth, carcass traits, muscle weights and meat characteristics

Cited by 11 publications

References 2 publications

Growth performance and meat characteristics of the first filial Awassi Rambouillet callipyge ram lambs

Growth performance and meat characteristics of the first filial Awassi Rambouillet callipyge ram lambs

Effects of available nutrition and sire breeding values for growth and muscling on the development of crossbred lambs. 1: Growth and carcass characteristics

Polymorphism of DLK1 and CLPG gene and their association with phenotypic traits in Chinese cattle

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