Journal
JOURNAL OF APPLIED ANIMAL RESEARCH
Volume 51, Issue 1, Pages 382-387Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09712119.2023.2203725
Keywords
Black Tibetan sheep; forage-to-concentrate ratio; fat deposition; fatty acid composition; gene expression
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This study evaluated the effects of dietary concentrate: forage ratio on fat deposition, fatty acid composition, oxidative stability, and mRNA expression levels of sirtuins genes associated with adipose tissue metabolism in Black Tibetan sheep. The results showed that a C:F ratio of 50:50 was the most suitable for finishing lambs.
This study was carried out to evaluate the effects of dietary concentrate: forage (C: F) ratio on fat deposition, fatty acid composition, oxidative stability and mRNA expression levels of sirtuins genes associated with adipose tissue metabolism of subcutaneous fat in Black Tibetan sheep. Three diets with different C: F (HC: 70:30, IC:50:50 and LC: 30:70) were fed to fifteen weaned male lambs (2-month-old, 10.05 & PLUSMN; 0.96 Kg). The experiment lasted for 120 d. Five lambs from each group were randomly selected and slaughtered at the end of the experiment. The subcutaneous fat thicknesses increased with increasing concentrate level (P < 0.05). The concentration of polyunsaturated fatty acid (PUFA), C15:1 and C18:2n decreased by feeding the HC diet (P < 0.05). Both glutathione peroxidase (GSH-Px) and superoxide dismutase (SOD) activities significantly increased as dietary concentration levels decreased (P < 0.05). Additionally, SIRT1 and SIRT2 expression level was downregulated (P < 0.05) with increasing concentration supplementation (P < 0.05 and P < 0.05, respectively). In conclusion, the addition of 70% concentration supplementation is not recommended in Black Tibetan sheep, considering that no benefits were observed for nutrient utilization, oxidative stability or economic returns, while the supplementation of C: F at 50:50 proved to be suitable for finishing lambs.
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