Between different experimental groups at the same age: at 30 days of age, the relative expression of BMP-2 mRNA in the thoracic vertebrae of the CHF and BPs groups was higher than that of the NC group, and the BPs-H and BPs-M groups were significantly higher than those of the BPs-L group (p < 0.05). Here, BMP2 is linked to congestive heart failure.