Table 4 Changes in pH of pig small intestine by different packaging methods during cold storage at 4℃

Treatment	Storage days				SEM
	1	4	7	10
AP	6.82Aa	6.65ABb	6.52Bc	6.57Bbc	0.03
SP	6.75ABa	6.62Bb	6.61Ab	6.73Aa	0.02
VP	6.65Ba	6.69Aa	6.47Cb	6.46Cb	0.02
SEM	0.03	0.01	0.01	0.03

^A–C Means with different superscripts within a same column differ significantly (p<0.05).
^a–c Means with different superscripts within a same row differ significantly (p<0.05).
AP, aero packaging; SP, skin-pack packaging; VP, vacuum packaging.