an increasing trendp < 0.05
The intramuscular fat content in the longissimus thoracis muscle of Tibetan sheep shows an increasing trend from 4 months to 1.5 years old ( p < 0.05), while the MYH4 gene exhibits differential expression between the longissimus thoracis muscles at 4 months and 1.5 years old ( Wen et al., 2022 ).