Diploid males have long been considered a curiosity contradictory to the haplo-diploid mode of sex determination in the Hymenoptera. In Apis mellifera, 'false' diploid male larvae are eliminated by worker cannibalism immediately after hatching. A 'cannibalism substance' produced by diploid drone larvae to induce worker-assisted suicide has been hypothesized, but it has never been detected. Dipl...

Emerging evidence suggests that assisted hatching (AH) techniques may improve clinical pregnancy rates, particularly in poor prognosis patients; however, there still remains considerable uncertainty. We conducted a meta-analysis to verify the effect of AH on pregnancy outcomes. We searched for related studies published in PubMed, Web of Science, and Cochrane library databases from start dates t...

Within Galliformes, megapods (brush turkey, malleefowl, scrubfowl) exhibit unique forms of parental care and growth. Hatchlings receive no post-hatching parental care and exhibit the most exaggerated precocial development of all extant birds, hatching with fully developed, flight-capable forelimbs. Rather than flying up to safety, young birds preferentially employ wing-assisted incline running....

The effect of acetylsalicylic acid (ASA) injected in ovo on the 18 d of incubation on the hatchability, course of hatching, and thyroid hormone concentrations (thyroxine (T4) and triiodothyronine (T3)) in the blood of chicks exposed to control (CON) or hyperthermic (HT) conditions during hatching were investigated. Eggs (n=540) from a broiler breeder flock were incubated under standard conditio...

MCKINDSEY, C.W., and MCLAUGHLIN, J.D. 1994. Transmission of Cyclocoelum mutabile (Digenea) to snails: the influence of temperature on the egg and miracidium. Can. J. Zool. 72: 1745 175 1. This study examined the survival and hatching dynamics of eggs of the digenean Cyclocoelum mutabile and the survivorship and infectivity of the miracidia under different temperature regimes. Hatching did not o...

OBJECTIVE The objective of this prospective randomised study was to evaluate if there is an improvement in clinical outcomes when assisted hatching (AH) is performed in embryos derived from vitrified/warmed oocytes in an ovum donation programme using egg cryobanking. STUDY DESIGN Sixty oocyte recipients in a donation programme using egg cryobanking were randomly allocated to the assisted hatc...

Prostaglandins participate in a variety of female reproductive processes, including ovulation, fertilization, embryo implantation and parturition. In particular, maternal prostacyclin (PGI(2)) is critical for embryo implantation and the action of PGI(2) is not mediated via its G-protein-coupled membrane receptor, IP, but its nuclear receptor, peroxisome-proliferator-activated receptor δ (PPARδ)...