Table 2.

Average plasma vitamin E, vitamin C, malondialdehyde, and glucose concentrations of dogs fed either a control performance diet or high endurance dog food (test) over several months

	Month						P value
Item	August1	October	November	January	March	SEM2	Diet	Month	Diet × month
Vitamin E, µg/mL						1.3	<0.01	<0.01	<0.01
Control	26.2Bx	14.6Ax	14.7Ax	15.4Ax	13.1Ax
Test	25.6Ax	30.9By	26.1Ay	27.3Ay	25.6Ay
Vitamin C, mg/dL						0.1	0.003	<0.01	0.07
Control	3.3	3.3	3.7	3.5	2.93
Test	3.1	3.1	3.1	2.9	2.73
Malondialdehyde, nmol/mL						0.6	0.21	<0.01	0.33
Control	7.4	10.03	7.3	6.2	7.2
Test	7.8	11.53	6.9	7.2	7.0
Glucose (glucometer), mg/dL						2.3	0.02	0.47	0.88
Control	n/a4	114.6	116.3	115.4	116.1
Test	n/a	108.6	112.7	108.9	110.4

¹All dogs were fed the same diet prior to baseline (August) sample collection. Then, all dogs were randomly assigned to the control performance diet or high endurance test diet groups.

²Pooled SEM.

³Means in the same row not sharing a common superscript differ (P < 0.05) due to month.

⁴n/a = not available.

^ABCMeans in the same row not sharing a common superscript differ (P < 0.05) due to a diet × month interaction.

^xyMeans in the same column not sharing a common superscript differ (P < 0.05) due to a diet × month interaction.