Hormonal changes, behaviour, ovulation and fertility were examined in response to coitus at two different times during oestrus in the female @entity468 housed in conditions of natural light (N = 13). On Day 2 or Day 4/5 of oestrus females were allowed 1 copulation in 15 min (single matings) or 2-3 copulations in 30 min (multiple matings). Plasma LH, @entity53 -17 beta and @entity1420 concentrations during the 24-h period after coitus were measured by radioimmunoassay; ovulation was assumed to have occurred if @entity1420 values were elevated 7-30 days after coitus. With the exception of 2 out of 3 animals receiving single matings on Day 2 of oestrus, all animals showed subsequent elevated @entity1420 values. Females receiving multiple matings had significantly greater releases of LH as measured by the area under the curve than those receiving single matings. There was significantly greater variability in the LH response of queens on Day 2 of oestrus compared to those on Day 4/5 for peak values and area under the curve; the only failure in release of LH was in queens on Day 2. @entity53 levels did not differ significantly between Day 2 and Day 4/5 of oestrus. @entity1420 values remained less than 1 ng/ml for 24 h after coitus. Both LH peak values and area under the curve were significantly greater for animals that became pregnant. There were also significant differences in coital behaviour between queens on Day 2 and those on Day 4/5 of oestrus.(ABSTRACT TRUNCATED AT 250 WORDS)

Observations on variability in LH release and fertility during oestrus in the @entity468 ( XXXX ).

@entity468 :: ('9685', 'Species') :: ['domestic cat'] @entity1420 :: ('MESH:D011374', 'Chemical') :: ['progesterone', 'Progesterone'] @entity53 :: ('MESH:D004958', 'Chemical') :: ['oestradiol', 'Oestradiol']
@entity468 :: (9685,Species) :: ['Felis catus']
