Thyroid Hormone Concentrations: Some Kinetic Parameters of Triiodothyronine and Metabolic Rate in 'Double-Muscled' Cattle

Strath, R. A.; Basarab, J. A.; Thompson, James R.; Berg, R. T.

doi:10.4141/cjas82-045

Cited by 8 publications

(3 citation statements)

References 17 publications

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“…However, the daily energy expenditure of BBDM bulls was similar to that of non-DM bulls [ 49 ]. These results are not in agreement with previous findings [ 175 ], based on indirect calorimetry measurement in DM and phenotypically normal bulls. The metabolic rate was significantly higher in DM bulls and found to be 415.0 vs. 365.9 kJ/kg body weight daily.…”

Section: Consequences Of the Inactivation Of Myostatin On Conformacontrasting

confidence: 99%

Double Muscling in Cattle: Genes, Husbandry, Carcasses and Meat

Fiems¹

2012

Animals

115

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Simple SummarySelection for an increased meatiness in beef cattle has resulted in double-muscled (DM) animals, owing to the inactivation of the myostatin gene. These animals are characterized by an excellent conformation and an extremely high carcass yield, coinciding with a reduced organ mass. As a consequence, voluntary feed intake is reduced, but feed efficiency is considerably improved, although maintenance requirements are not clearly reduced. DM animals are more susceptible to respiratory disease, stress and dystocia, requiring extra attention for accommodation and welfare. Carcasses of DM animals are very lean, and intramuscular fat content is low. The fatty acid profile is different when compared with non-DM animals, containing less saturated fatty acids. Collagen content of the meat is lower, so that meat from double-muscled animals is mostly more tender. However, meat tenderness, color and juiciness are not always improved. A different metabolism as a consequence of faster glycolytic myofibers can be partly responsible for this phenomenon. DM animals are interesting for the producer and butcher, and beneficial for the consumer, if an appropriate nutrition and accommodation, and adequate slaughter conditions are taken into account.AbstractMolecular biology has enabled the identification of the mechanisms whereby inactive myostatin increases skeletal muscle growth in double-muscled (DM) animals. Myostatin is a secreted growth differentiation factor belonging to the transforming growth factor-β superfamily. Mutations make the myostatin gene inactive, resulting in muscle hypertrophy. The relationship between the different characteristics of DM cattle are defined with possible consequences for livestock husbandry. The extremely high carcass yield of DM animals coincides with a reduction in the size of most vital organs. As a consequence, DM animals may be more susceptible to respiratory disease, urolithiasis, lameness, nutritional stress, heat stress and dystocia, resulting in a lower robustness. Their feed intake capacity is reduced, necessitating a diet with a greater nutrient density. The modified myofiber type is responsible for a lower capillary density, and it induces a more glycolytic metabolism. There are associated changes for the living animal and post-mortem metabolism alterations, requiring appropriate slaughter conditions to maintain a high meat quality. Intramuscular fat content is low, and it is characterized by more unsaturated fatty acids, providing healthier meat for the consumer. It may not always be easy to find a balance between the different disciplines underlying the livestock husbandry of DM animals to realize a good performance and health and meat quality.

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Section: Consequences Of the Inactivation Of Myostatin On Conformacontrasting

confidence: 99%

Double Muscling in Cattle: Genes, Husbandry, Carcasses and Meat

Fiems¹

2012

Animals

115

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“…ou plus ŽlevŽes(Strath et al 1982) que celles de sujets non culards. On retiendra que les diffŽrences observŽes entre les races pour la composition de la carcasse sont liŽes principalement ˆ des diffŽrences dans les concentrations dÕinsuline et de GH.…”

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Influence du caractère culard sur la production et la qualité de la viande des bovins Blanc Bleu Belge

et al. 1998

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Lorsqu’on les compare à des sujets mixtes de la même race, les taurillons Blanc Bleu Belge (BBB) culards réalisent des gains quotidiens moyens au moins aussi élevés tout en consommant moins d’aliments. L’amélioration de l’efficacité alimentaire est expliquée principalement par la composition des gains de poids : la carcasse d’un sujet BBB culard contient au moins 60 kg de muscle en plus et 30 kg de graisse en moins que celle d’un sujet mixte abattu au même poids vif. Lorsque le poids vif augmente, on observe, dans les deux types, une augmentation du rendement à l’abattage et de la proportion de viande maigre dans la carcasse. La composition chimique et les qualités organoleptiques des viandes sont, elles aussi, influencées par le caractère culard. La teneur en gras est réduite et la proportion d’acides gras polyinsaturés est augmentée chez le culard, ce qui constitue un avantage nutritionnel. L’évolution plus rapide du pH post mortem chez le taurillon culard ne peut expliquer que très partiellement les différences observées pour les qualités sensorielles. La couleur plus pâle de la viande est liée en grande partie à sa faible teneur en myoglobine. L’avantage du culard en matière de tendreté, expliqué par une teneur faible en collagène, n’apparaît pas dans un morceau noble de la carcasse à faible teneur en collagène. Enfin, dans la majorité des études disponibles à ce jour, la capacité de rétention d’eau de la viande produite par les culards apparaît peu différente de celle des non culards. Les concentrations de plusieurs métabolites sanguins indiquent une répartition des nutriments favorable au dépôt de protéines et défavorable au dépôt de graisses chez le culard. Lors de l’engraissement, les particularités endocriniennes concernent essentiellement l’hormone de croissance et l’insuline ; elles peuvent expliquer la répartition particulière des nutriments.

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“…Both DM phcnotypes had higher (P<0.01) erythrocyte glucose consumption and lactrc acid production than normal-muscled, Holmes et al (1912Holmes et al ( , 1913 For personal use only. (Basarab et al 1980) or serum T. concentration (Strath et al 1982). This apparent inconsistency has also been observed by others (Oliver and Cartwright 1968;Holmes and Robinson 1970 …”

mentioning

confidence: 64%

Glucose Consumption and Lactic Acid Production by Erythrocytes From Double-Muscled Cattle

Basarab¹,

Berg²,

Thompson³

1982

Can. J. Anim. Sci.

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Thyroid Hormone Concentrations: Some Kinetic Parameters of Triiodothyronine and Metabolic Rate in 'Double-Muscled' Cattle

Abstract: 1982. Thyroid hormone concentrations: some kinetic parameters of triiodothyronine and metabolic rate in'double-muscled'cattle. Can. J. Anim. Sci. 62 381-395. Serum triiodothyronine (T.,) and thyroxine (T)

Cited by 8 publications

References 17 publications

Double Muscling in Cattle: Genes, Husbandry, Carcasses and Meat

Double Muscling in Cattle: Genes, Husbandry, Carcasses and Meat

Influence du caractère culard sur la production et la qualité de la viande des bovins Blanc Bleu Belge

Glucose Consumption and Lactic Acid Production by Erythrocytes From Double-Muscled Cattle

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