Results: 21

Low versus high antral follicle count on the fertility of timed AI Nelore heifers

This study aimed to determine the effect of antral follicle count (AFC), and pubertal status on the fertility of beef heifers. In this study, 230 Nelore heifers, 20±2 months of age, were subjected to an estradiol progesterone-based timed artificial insemination (TAI) program. On Day 0 of the TAI protoco...

Functional limitation on elderly people in the northeast and the feminization of eld in urban and rural areas of Brazil

Acta sci., Health sci; 43 (), 2021
Population aging in Brazil increases on a large scale due to declining fertility and mortality. This phenomenon can be influenced by several factors (demographic, biological and social), making them determinants for the health conditions of the elderly populations residing in different geogra...

Biology of Corythucha gossypii Fabricius, 1794 (Hemiptera: Tingidae) in Ricinus communis at different temperatures and thermal requirements

Braz. j. biol; 79 (2), 2019
Abstract We studied the biology of Corythucha gossypii in Ricinus communis under different temperatures in climatic chambers adjusted at 20, 23, 25, and 28 °C, 60 ± 10% relative humidity, and a 12-h photoperiod. The development period and viability of eggs, the development period and survival rate of ...

Increasing the chances of natural conception: opinion statement from the the brazilian federation of gynecology and obstetrics associations - FEBRASGO committee of gynecological endocrinology

Abstract Considering that myths and misconceptions regarding natural procreation spread rapidly in the era of easy access to information and to social networks, adequate counseling about natural fertility and spontaneous conception should be encouraged in any kind of health assistance. Despite the fact t...

Reality of premature ovarian failure in Argentina

SUMMARY Premature Ovarian Insufficiency is defined as a decline in ovarian function that is accompanied by two biochemical determinations of Follicle Stimulating Hormone in hypergonadotropic values, in addition to low levels of circulating estrogens in women under 40 years old. Although some of its possi...

Determinación de la reserva ovárica mediante el recuento de folículos antrales en mujeres en edad reproductiva

Rev. méd. Chile; 145 (6), 2017
Background: Age plays a crucial role in women fertility and is related with a decreased oocyte quality and quantity. The evidence for this asseveration comes from data obtained in infertile women. However there is a paucity of studies in patients with proven fertility evaluating ovarian reserve and its d...

Comparison of sexual performance and testicular characteristics of melatonin treated Kivircik and Charollais rams during the non-breeding season

This study was conducted to investigate the effects of melatonin implantation on basic testicular characteristics and reproductive performance of Kivircik and Charollais rams and ewes during the non-breeding season. In this study, 8 Kivircik and 6 Charollais rams were used. Rams were implanted with 54 mg...

Las agregaciones de desove de Tylosurus pacificus (Beloniformes: Belonidae) y su pesca en el Parque Nacional Natural Utría (Pacífico colombiano)

Rev. biol. trop; 65 (1), 2017
ResumenAlgunas especies de peces marinos tienen complejas relaciones con los ecosistemas costeros durante sus periodos reproductivos, tal es el caso del pez aguja Tylosurus pacificus, que conforma agregaciones de desove en playas de grava en el Parque Nacional Natural Utría. Se describe la actividad pes...

Parámetros biológicos básicos para la conservación de Pseudocurimata lineopunctata (Characiformes, Curimatidae) en el Río Anchicayá, Valle del Cauca, Colombia

Rev. biol. trop; 65 (1), 2017
ResumenPseudocurimata lineopunctata representa un importante aporte nutricional para las comunidades locales en Colombia y Ecuador. A pesar que su captura anual es baja (590 kg/año), no hay restricciones sobre el tamaño mínimo, y esta especie está catalogada como vulnerable en riesgo de extinción mo...

Reproductive cycle of the endemic and threatened fish Puntius shalynius (Cypriniformes: Cyprinidae) in Meghalaya, India

Rev. biol. trop; 65 (1), 2017
Abstract:Puntius shalynius is a highly endemic freshwater minor carp that is economically important and is threatened because of its ornamental value. The present investigation evaluated this barb gonadal maturation, based on morphology and spawning of this species in the Umiam river, Meghalaya, India. T...