Results 261 to 270 of about 5,460,868 (330)
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Male Pregnancy and Biparental Immune Priming
The American Naturalist, 2012In vertebrates, maternal transfer of immunity via the eggs or placenta provides offspring with crucial information on prevailing pathogens and parasites. Males contribute little to such transgenerational immune priming, either because they do not share the environment and parasite pressure of the offspring or because sperm are too small for transfer of
O. Roth +4 more
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Reduced cannibalism during male pregnancy
Behaviour, 2016Cannibalism provides energetic benefits but is also potentially costly, especially when directed towards kin. Since fitness costs increase with time and energy invested in offspring, cannibalism should be infrequent when parental investment is high. Thus, filial cannibalism in male syngnathids, a group known for the occurrence of male pregnancy, should
M. Cunha +3 more
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The evolution and physiology of male pregnancy in syngnathid fishes
Biological Reviews of The Cambridge Philosophical Society, 2020The seahorses, pipefishes and seadragons (Syngnathidae) are among the few vertebrates in which pregnant males incubate developing embryos. Syngnathids are popular in studies of sexual selection, sex‐role reversal, and reproductive trade‐offs, and are now
C. Whittington, Christopher R. Friesen
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Science of the Total Environment, 2020
Exposure to environmental estrogens and progestins has contributed to adverse effects on the reproduction of many aquatic wildlife species. However, few reports have paid attention to fish species with specialized reproductive strategies, such as male ...
G. Qin +5 more
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Exposure to environmental estrogens and progestins has contributed to adverse effects on the reproduction of many aquatic wildlife species. However, few reports have paid attention to fish species with specialized reproductive strategies, such as male ...
G. Qin +5 more
semanticscholar +1 more source
General and Comparative Endocrinology, 2019
The gonadotropin-inhibitory hormone (GnIH) plays a negative role in the hypothalamic-pituitary-gonadal (HPG) axis by inhibiting gonadotropin secretion in vertebrates. Male pregnancy and ovoviviparous behavior are unique phenomena among vertebrates.
Huixian Zhang +3 more
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The gonadotropin-inhibitory hormone (GnIH) plays a negative role in the hypothalamic-pituitary-gonadal (HPG) axis by inhibiting gonadotropin secretion in vertebrates. Male pregnancy and ovoviviparous behavior are unique phenomena among vertebrates.
Huixian Zhang +3 more
semanticscholar +1 more source
Male Contributory Factors in Recurrent Pregnancy Loss
Reproductive Sciences, 2023With 40% of idiopathic cases, recurrent pregnancy loss (RPL) is a problem of great concern for patients and clinicians. In addition to financial burden, it causes a lot of frustration and anxiety in affected couples. The primary objective of this review was to gain knowledge of recent advances in the field of recurrent pregnancy losses and to ...
Sarla Naglot +3 more
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Nigerian male sexual activity during pregnancy
International Journal of Gynecology & Obstetrics, 2002AbstractObjectives: To determine the prevalence of extra‐marital sexual affairs as well as other aspects of male sexual behavior during pregnancy in Nigeria. Methods: A questionnaire survey of the husbands of consecutive women who delivered in three tertiary care centers in south‐eastern Nigeria within an 8‐week period.
H E, Onah +4 more
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Pregnancy Test using Male Toads
Nature, 1949STARTING in November 1948, a series of tests1 for pregnancy were performed using the native male toad, Bufo melanostictus Schneid. Specimens of urine from women pregnant from six weeks to seven months were used. In each series, two or more experimental toads were used.
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