Table 1.

Comparison of the microvascular architecture of villi at different ages (mean ± SEM)

	Ablactation rats	Adult rats	Aged rats
Diameter of arteriole (µm)	6.17 ± 1.51	10.47 ± 2.25a	16.73 ± 3.28c
Diameter of venule (µm)	20.43 ± 3.17	25.45 ± 3.07b	25.50 ± 3.34
Ratio: arteriole/venule	0.30 ± 0.04	0.41 ± 0.04a	0.65 ± 0.06c

^aP < 0.01,

^bP < 0.05 vs ablactation rats;

^cP < 0.01 vs adult rats.