Expression of genes related to the regulation of muscle protein turnover in Angus and Nellore bulls1
Autor: | R. A. Gomes, Antonio Chalfun-Junior, A. C. Rodrigues, Márcio Machado Ladeira, Mario Luiz Chizzotti, Marcio de Souza Duarte, Luciano Vilela Paiva, Karina Costa Busato, N. C. Freitas |
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Rok vydání: | 2016 |
Předmět: |
0301 basic medicine
Meal Glycogen Silage Protein turnover General Medicine Myostatin Biology Breed Muscle hypertrophy 03 medical and health sciences chemistry.chemical_compound 030104 developmental biology Animal science chemistry Gene expression Genetics biology.protein Animal Science and Zoology Food Science |
Zdroj: | Journal of Animal Science. 94:1472-1481 |
ISSN: | 1525-3163 0021-8812 |
Popis: | We aimed to evaluate the expression of genes related to the regulation of muscle protein turnover in the longissimus dorsi (LD) muscle of Angus and Nellore bulls and to estimate the within-breed correlations of gene expression and performance traits. Thirteen genes related to the IGF-1 and myostatin pathways were studied. Thirteen animals, with an initial average BW of 381.2 ± 11.8 kg, from each breed were used in a completely randomized 2 × 2 factorial design (2 breeds and 2 feeding levels). The diet consisted of corn silage and a corn-soybean meal concentrate in a roughage-to-concentrate ratio of 30:70. Cattle were fed ad libitum (with 9 animals from each breed) or feed restricted (a 55% restriction of total DMI of ad libitum-fed animals, calculated as percentage of metabolic BW, with 4 animals of each breed). The experimental period lasted for 82 d and it was preceded by a 28-d adaptation period. The performance traits evaluated were slaughter body weight, total ADG (from d 1 to 82 of the trial), initial ADG (from d 1 to 41 of the trial), final ADG (from d 42 to 82 of the trial), total DMI (from d 1 to 82 of the trial), initial DMI (from d 1 to 41 of the trial), final DMI (from d 42 to 82 of the trial), HCW, LD weight (LDW), and rib eye area (REA). After slaughter, samples were taken from the LD muscle between the 12th and 13th ribs for gene expression analysis by quantitative reverse transcription PCR. There was no difference ( > 0.05) in the expression of any of the genes studied between ad libitum-fed Angus and ad libitum-fed Nellore, whereas feed restriction increased the expression of (; < 0.001), (; = 0.05), and (; = 0.04) and decreased the expression of ( < 0.01). The REA was negatively correlated to (; = 0.01), (; = 0.02), and ( = 0.05). The HCW was negatively correlated to ( = 0.01) and ( = 0.01) and tended to be negatively correlated to ( = 0.07), whereas the LDW tended to be negatively correlated to ( = 0.08). The genes , , and seem to be important for muscle growth and may be worthy of further investigation as future strategies for increasing muscle in livestock. |
Databáze: | OpenAIRE |
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