نتایج جستجو برای: age at sexual maturity
تعداد نتایج: 4211057 فیلتر نتایج به سال:
INTRODUCTION Pregnant mares and post-weaning foals are often fed concentrates rich in soluble carbohydrates, together with forage. Recent studies suggest that the use of concentrates is linked to alterations of metabolism and the development of osteochondrosis in foals. The aim of this study was to determine if broodmare diet during gestation affects metabolism, osteoarticular status and growth...
در مطالعه حاضر، اثر نر تلاقی گر (service sire)بر صفات تولید مثل، شامل وزن تخم مرغ (egg weight)، سن بلوغ جنسی (age at sexual maturity)، تعداد تخم مرغ های قابل جوجه کشی (eggs set)، تعداد تخم مرغ های بارور (eggs fertile)، تعداد جوجه های حاصل از هر مرغ (chicks number)، درصد تخم های بارور به تخم های قابل جوجه کشی یا باروری (percentage fertility) و درصد جوجه های حاصل از تخم های بارور (percentage hatc...
This study was conducted to determine the concentration of five heavy metals, including lead, cadmium, mercury, arsenic, and chromium in muscle, liver and gills of the gray mullet, Liza aurata in southern part of the Caspian Sea. The samples were collected during sexual maturity (in the fall) and sexual rest (in the spring). The mean concentration of lead, cadmium, mercury, arsenic, and chromiu...
The ringed seal is a small phocid that has northern circumpolar distribution. It long been recognized body size variable in seals, and it suggested ecotypes differ exist. This study explores patterns of (length girth) age-at-maturity across most the Arctic subspecies’ range using morphometric data from 35 sites. Asymptotic lengths varied 113 to 151 cm, with sites falling into five distinct clus...
1. In environmental sex determination (ESD) gender is decided after conception, depending on the environment, rather than being genetically fixed. ESD in plants has been mainly studied in angiosperms, where the dominant form of ESD is sexual lability. Surprisingly, ESD has rarely been studied in homosporous ferns, the only plants in which ESD is the rule, rather than the exception. 2. Here, we ...
This study was conducted to determine the concentration of five heavy metals, including lead, cadmium, mercury, arsenic, and chromium in muscle, liver and gills of the gray mullet, Liza aurata in southern part of the Caspian Sea. The samples were collected during sexual maturity (in the fall) and sexual rest (in the spring). The mean concentration of lead, cadmium, mercury, arsenic, and chromiu...
OBJECTIVE The aim of this study was to examine the relative contributions of body mass index (BMI) and pubertal measures for risk and age of onset of pediatric MS. METHODS Case-control study of 254 (63% female) MS cases (onset<18 years of age) and 420 (49% female) controls conducted at 14 U.S. Pediatric MS Centers. Sex- and age-stratified BMI percentiles were calculated using CDC growth chart...
in the present study histological studies was conducted after the female abramis brama orientalis was exposed to eight treatment phases in which lhrha2 (3 μg/kg), metoclopramide (5 mg/kg), and chlorpromazine (10 mg/kg) were inoculated. the treatments were characterized by combined and solitary injections, control group (o injection), and experimental group (saline). the results showed that all ...
This study evaluated the plasma membrane integrity, acrosomal membrane integrity, and mitochondrial membrane potential of Nelore bull sperm from early puberty to early sexual maturity and their associations with sperm motility and vigor, the mass motility of the spermatozoa (wave motion), scrotal circumference, and testosterone. Sixty Nelore bulls aged 18 to 19 months were divided into four lot...
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