منابع مشابه
Estimating limits for natural human embryo mortality
Natural human embryonic mortality is generally considered to be high. Values of 70% and higher are widely cited. However, it is difficult to determine accurately owing to an absence of direct data quantifying embryo loss between fertilisation and implantation. The best available data for quantifying pregnancy loss come from three published prospective studies (Wilcox, Zinaman and Wang) with dai...
متن کاملEmbryonic mortality and embryo-pathogen interactions.
Embryonic mortality (EM) has a substantial impact on the fertility of domestic animals. Most of the embryonic losses occur during the first days after fertilization and during the process of implantation. Causes of EM can be divided into infectious and non-infectious categories. Primary attention has often been given to infectious agents but non-infectious causes probably account for 70% or mor...
متن کاملTemperature-dependent sex-biased embryo mortality in a bird.
Sex ratios have important evolutionary consequences and are often biased by environmental factors. The effect of developmental temperature on offspring sex ratios has been widely documented across a diverse range of taxa but has rarely been investigated in birds and mammals. However, recent field observations and artificial incubation experiments have demonstrated that the hatching sex ratio of...
متن کاملHysteroscopic Subendometrial Embryo Delivery (SEED), Mechanical Embryo Implantation
Background A major hurdle to improved in vitro fertilization (IVF) success rate is defective endometrial receptivity and implantation. Various techniques have been advocated to increase implantation while reducing side effects. Currently, embryo transfer (ET) is performed blindly without direct visualization. As such, we sought to develop a technique utilizing a flexible minihysteroscope with a...
متن کاملIn vivo embryogenesis, embryo migration, and embryonic mortality in the domestic cat.
In vivo embryogenesis, embryo migration, and survival were studied in the domestic cat. Queens were naturally mated (three times daily) on the second and third days of behavioral estrus and, if ovulation occurred, ovariohysterectomized at 64 (n = 8), 76 (n = 11), 100 (n = 8), 124 (n = 7), 148 (n = 6), and 480 h (n = 8) after first copulation. Of 52 cats mated, 48 (92.3%) ovulated (as evidenced ...
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ژورنال
عنوان ژورنال: Journal of the American Association of Instructors and Investigators of Poultry Husbandry
سال: 1920
ISSN: 2666-3651
DOI: 10.3382/ps.0060077