Table 12.

Effect of species and sampling time on purine derivatives:creatinine and urea:creatinine ratios obtained from spot collection after 2-h intervals

Time of sampling (h)	PD:C1	U:C2
		Goat	Sheep
0000	1.40	2.81	4.67
0200	1.37	1.86	6.89
0400	2.70	3.98	11.67
0600	2.23	3.92	8.48
0800	3.37	5.16	13.70
1000	2.69	3.83	9.28
1200	3.15	3.72	16.11
1400	2.45	3.30	9.83
1600	2.64	5.23	14.83
1800	2.39	3.02	12.01
2000	2.34	3.61	6.84
2200	2.04	2.97	7.73
SEM	1.13	1.47	1.58
	P value3
Time of sampling	0.27	<0.01	<0.01
S × T	0.58	0.04	0.04

¹PD:C = purine derivatives:creatinine ratio.

²U:C = urea:creatinine ratio.

³S × T = interaction between species and time of sampling.