Results 241 to 250 of about 1,568,056 (388)

Sex‐dependent effects of infection on guppy reproductive fitness and offspring parasite resistance

open access: yesJournal of Animal Ecology, Volume 94, Issue 4, Page 706-716, April 2025.
We infected offspring of guppy, Poecilia reticulata, pairs in which either the father or the mother had previously been infected. We found that, in accordance with parental investment theory, fathers prioritise offspring quantity (left figure: pairs in which fathers had been infected produced more offspring than those in which mothers had been infected)
Isabella L. G. Weiler   +3 more
wiley   +1 more source

Effect of Electromagnetic Fields and Protective Effect of Zinc Sulfate on Count and Motility of Adult Rat\'s Sperms

open access: yesپزشکی بالینی ابن سینا, 2009
Introduction & Objective: The aim of this study was to investigate the effect of electromagnetic field on the count and motility of adult rat's sperms and the protective effect of different dosages of zinc sulfate on it.
Majid Jasemi   +3 more
doaj  

Commercial Surrogacy Is not a Secret Handshake: It Is a High‐Five: Gay Fathers in China’s Changing Landscape

open access: yesThe British Journal of Sociology, EarlyView.
ABSTRACT In 2023, China introduced regulatory amendments to birth certificates and the hukou (household registration) system, aiming to boost birth rates and offset an aging population. However, the implications of these changes on marriage and family support amidst population policy shifts remain underexplored.
Eileen Y. H. Tsang
wiley   +1 more source

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