Characterization of Oestrus Cycles in Namibian Swakara and Damara Sheep through Determination of Circannual Plasma Progesterone Levels

Table 1

Comparison of plasma mean seasonal peak P4 and AUCPM in nonbred Swakara and Damara ewes.

Statistic or measure	Spring		Summer		Autumn		Winter
	Swakara	Damara	Swakara	Damara	Swakara	Damara	Swakara	Damara
Mean P4±SEM (ng/ml)	2,86±0,5	11,6±0,29	6,36±0,24	11,24±0,18	7,24±0,06	11,1±0,1	5±0,69	11,51±0,21
Mean AUCPM±SEM (ngday/ml P4)	28,74±12,31	119,24±5,4	68,18±6,58	122,08±19,37	79,53±4,11	114±7,12	55,01±10,32	110,87±9,18
Coefficient of variation of P4 peaks (%)	39,12	5,64	8,27	1,62	1,92	2,18	36,62	4,80
Coefficient of variation of AUCPM (%)	42,82	10,12	21,58	15,87	12,65	15,30	49,66	21,90

AUCPM = area under the curve P4 measurement.