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Example sentences for: opossums
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Pheromone exposure activates the hypothalamo-pituitary-gonadal (HPG) axis as evidenced in increased plasma LH in opossums [ 32 ] and voles [ 33 ] , and ovarian activation and subsequent steroid hormone production could stimulate somatic growth indirectly by effects on growth hormone and fat deposition, or alterations in metabolism and appetite.
Juvenile female opossums (n = 28) were weaned at 56 days and individually housed at 84 days in polycarbonate cages (30 × 30 × 15 cm) in a mixed-sex colony in an American Association for Accreditation of Laboratory Animal Care-approved facility in the Botany and Zoology Building at The Ohio State University.
Sixty grams is confirmed as a critical body mass for induction of estrus in juvenile female opossums as identified in our previous study [ 7 ] . Somatic growth and attainment of a threshold body mass or energy reserves are known requisites for puberty in many mammals including the tammar wallaby [ 26 ] , sheep [ 27 28 ] , and several species of rodents [ 1 ] , but these factors seldom act independently of environmental factors such as photoperiod [ 26 27 ] or social cues [ 3 29 ] . The opossum is unusual in this regard, because social cues in the form of male pheromone appear to stimulate both somatic growth and ovarian activation.
Plasma concentrations of estradiol in opossums are low (<15 pg/ml) during anestrus and are elevated (>20 pg/ml) only during estrus [ 15 ] . Mean plasma estradiol concentrations as high as 58 pg/ml have been reported in estrous females [ 25 ] , but a gradual increase in circulating estradiol during pheromonal induction of estrus in opossums has not been described.
The people who followed the Lord were called the twelve opossums .
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