Triploidy occurs in 2 to 3% of conceptuses and accounts for approximately 20% of chromosomally abnormal first-trimester miscarriages. As such, triploidy is estimated to occur in 1 of 3,500 pregnancies at 12 weeks', 1 in 30,000 at 16 weeks', and 1 in 250,000 at 20 weeks' gestation. We present a series of four cases of second-trimester triploidy diagnosed at our center within a 1-year timeframe. ...

Bata (Labeo bata), an indigenous, freshwater minor carp, is a great delicacy in Bangladesh. In its natural fishery, bata contributes significantly to the health and nutritional security of large section fisher communities However, it not popular farmed fish because small size slow growth rate. The induction triploidy, aimed at providing faster larger body size, could be appropriate for L. enhan...

This study compared the hematological characteristics of diploid and triploid of jundia, Rhamdia quelen juveniles, an important freshwater fish cultured in south Brazil. Hematological morphometry of erythrocytes were determined in blood smears under a light microscope. The blood was used to measure the number of red blood cells (RBC) with a hemocytometer Neubauer chamber, and the numbers of whi...

Hatching failure is a surprisingly common phenomenon given that natural selection constantly works against it. In birds, an average of about 10 per cent of eggs across species fail to hatch, often owing to the death of embryos. While embryo mortality owing to inbreeding is both well-documented and evolutionarily plausible, this is not true for other sources of mortality. In fact, the basis for ...

BACKGROUND In order to assess the role of binucleate giant oocytes for generating digynic triploidy, we studied their frequency, maturation patterns and chromosomal complements at metaphase II (MII) or after fertilization. METHODS Uncleaved, giant zygotes were incubated with podophyllotoxin and vinblastine, treated with hypotonic solution and fixed by a gradual fixation method. Giant MII oocy...

We investigated the pattern of inheritance of maternal meiotic errors responsible for a high frequency of triploid progeny in a selected line of chickens. For the genetic analysis, F1 and backcross populations were produced from crosses between normal diploid individuals of the triploidy line and a control line. Triploid embryos were produced by 35% and 67% of reciprocal F1 females and by 24% a...

OBJECTIVE To determine the pattern of early growth disturbance in chromosomally abnormal fetuses by comparing the volume of the fetal head to that of the trunk. METHODS The fetal trunk and head volume was measured using three-dimensional (3D) ultrasound in 145 chromosomally abnormal fetuses at a median gestational age of 12 (range, 11 + 0 to 13 + 6) weeks. The head volume was measured separat...

BACKGROUND Screening for fetal chromosome abnormalities in the first trimester includes analysis of the serological markers pregnancy-associated plasma protein A (PAPP-A) and free beta human choriogonadotropin (free beta hCG). The blood sample is traditionally taken around week 12 of gestation, but the performance of earlier blood sampling is not well documented. METHODS We studied 44,537 sin...