Serum was separated by centrifugation at
3000 rpm for 20 min and stored at 20 C until assayed.
Validated Food and Agriculture Organisation
(FAO) and International Atomic Energy Agency
(IAEA) progesterone RIA kits were used. Progesterone
concentrations equalling or exceeding 3.18 nmol/
l, were indicative of normal luteal function or pregnancy,
and levels under 3.18 nmol/l, were indicative of
either anoestrous, follicular, or early luteal phase of
the oestrous cycle (Zarkawi, 1997).
Serum was separated by centrifugation at
3000 rpm for 20 min and stored at 20 C until assayed.
Validated Food and Agriculture Organisation
(FAO) and International Atomic Energy Agency
(IAEA) progesterone RIA kits were used. Progesterone
concentrations equalling or exceeding 3.18 nmol/
l, were indicative of normal luteal function or pregnancy,
and levels under 3.18 nmol/l, were indicative of
either anoestrous, follicular, or early luteal phase of
the oestrous cycle (Zarkawi, 1997).
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