malformations which occur during the development of the avian body organs can lead to structural and functional abnormalities. most defects are recognized at hatching, but some go undetected until somewhat later. the cause of the majority of animal congenital malformations is unknown. a significant proportion of congenital malformations of unknown cause are likely to have an important genetic c...

Abstract Anthropogenic transformation of natural biocenoses has an impact on ecological niches and zoocultives living in them. The number domestic birds can now include many species birds, one way or another changed by man, including prey, protected purposefully bred. Falconiformes occupied a special place the cultural traditions different countries peoples. paper considers aspects biological f...

I investigated the microanatomy of distal urogenital system male Wood Frog (Lithobates sylvaticus) from a small sample (n = 6) collected in northern Arkansas February 2020. Specifically, my primary objectives were as follows: 1) to focus on histology paired Wolffian (urogenital) ducts caudally kidneys their merging with urodeum cloaca, 2) reveal structure seminal vesicles (sperm storage structu...

La madurez sexual es el resultado de varios factores que incluyen la edad cronológica, peso y composición corporal del ave, los cuales son influidos por patrimonio genético programas alimentación durante recría. El objetivo presente estudio fue evaluar comportamiento indicadores involucrados en proceso biológico mediante análisis multivariado para explicar su conjunto caracterizar desarrollo. S...

Purpose This study was performed to investigate the expression pattern of Wnt inhibitory factor 1 (Wif1) and β-catenin during anorectal development in normal and anorectal malformation (ARM) embryos and the possible role of Wif1 and β-catenin in the pathogenesis of ARM. Methods ARM was induced with ethylenethiourea on the 10th gestational day in rat embryos. Cesarean deliveries were performed...

Paedomorphosis is an alternative process to metamorphosis in which adults retain larval traits at the adult stage. It is frequent in newts and salamanders, where larvae reach sexual maturity without losing their gills. However, in some populations, larvae overwinter in water, while remaining immature. These alternative ontogenetic processes are of particular interest in various research fields,...

BACKGROUND PELVIS is an acronym defining the association of perineal hemangioma, malformations of external genitalia, lipomyelomeningocele, vesicorenal abnormalities, imperforate anus and skin tag. Eleven cases have been reported according to the Orphanet data. Acronyms of LUMBAR and SACRAL syndrome have been used and most probably represent a spectrum of the same entity. Very little is known a...