gestation. [ jes-ta?shun] the period of development of the young in viviparous animals, from the time of fertilization of the oocyte (ovum) to birth; see also pregnancy. gestation period the duration of pregnancy; in the human female, the average length, calculated from the first day of the last normal menstrual period, is days, or 6 lunar months. Oct 26, · The gestation period is how long a woman is pregnant. Most babies are born between 38 and 42 weeks of gestation. Babies born before 37 weeks are .
Gestation is the period of development during the carrying of an embryo or fetus inside viviparous animals. Mammals during pregnancy can have one or more gestations at the same how to tune a guitar to 528 hz, for example in a multiple birth.
The time interval of a gestation is called the gestation period. In human obstetricsgestational age refers to the fertilization age plus two weeks. This is approximately the duration since perior woman's last menstrual period LMP what does gestation period mean. In mammals, pregnancy begins when a zygote fertilized ovum implants in the female's uterus and ends once the fetus leaves the uterus. On the main article link above, are average and approximate gestation values ordered by number of days note: human gestational age is counted from the last menstrual period; for other animals the counting method varies, so these figures could be 14 days off.
Human pregnancy can be divided roughly into three trimesters, each approximately three months long.
The gestatoon trimester is from the last period through the 13th week, the second trimester is 14th—27th week, and the third trimester is 28th—42nd week. Various factors can come into play in determining the duration of gestation. For humans, male fetuses normally gestate several days longer than females and multiple pregnancies gestate for a shorter period. A viviparous animal is an animal employing viviparity : wbat embryo develops inside the body of the mother, as opposed to outside in an egg oviparity.
The mother then gives live birth. The less developed form of viviparity is called ovoviviparitywhich, for instance, occurs in most vipers. The more developed form of viviparity is called placental viviparity ; mammals are the best example, but it has also evolved independently in other animals, such as in scorpionssome sharksand gestatkon velvet worms.
Viviparous offspring live independently and require an external food supply from birth. Certain lizards also employ this method such as the genera Tiliqua and Corucia. Doed placenta is attached directly to the mother in these lizards which is called viviparous matrotrophy. Ovoviviparous animals develop within eggs that remain within the mother's body up until they hatch or are about to hatch.
This strategy of birth is what does gestation period mean as ovoviviparity. It is similar to vivipary in that the embryo develops within the eman body.
Unlike the embryos of viviparous species, ovoviviparous embryos are nourished by the egg yolk rather than by the mother's body. However, the mother's body does provide gas exchange. The young of ovoviviparous amphibians are sometimes born as larvaeand undergo metamorphosis outside the body of the mother. The fish family Syngnathidae has the unique characteristic whereby females lay their what does gestation period mean in a brood pouch on the male's chest, and the male incubates the eggs.
Fertilization may take place in the pouch or before implantation in the water. Included in Syngnathidae are seahorsesthe pipefishand the weedy and leafy sea dragons.
Syngnathidae is the only family in the animal kingdom to which the term what is the face value of a super bowl ticket male pregnancy " has been applied. From Wikipedia, the free encyclopedia.
Main article: Pregnancy mammals. Main article: Pregnancy. Oxford Dictionaries English. Britannica - The Online Encyclopedia. Current Biology. PMID Categories : Reproduction in mammals. Namespaces Article Talk. Views Read Edit View history. Help Learn to edit Community portal Recent changes Upload file.
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1. (Zoology) a. the development of the embryo of a viviparous mammal, between conception and birth: about days in humans, days in elephants, and 63 days in cats. b. (as modifier): gestation period. 2. the development of an idea or plan in the mind. 3. the period of such a development. Mar 29, · Gestation period: Fetal development period from the time of conception until birth. For humans, the full gestation period is normally 9 months. The word "gestation" comes from the Latin "gestare" meaning "to carry or to bear.".
Will she be tired all her pregnancy? My wife is 6 weeks pregnant with our first baby. She is tired all the time and goes to bed at 7 PM. Will she be like this the whole pregnancy? Don't worry, this is very common! Here are some tips to help her with her tiredness: -She should take short breaks during the day and lie down and lift her feet up. This can help her feel better and less tired. If she is at work and can't lie down, then she should just pick her legs up on a chair.
Is this the symptom of pregnancy? I have burning rashes all over my face and neck and it is itching a lot. I have consulted skin specialist also and he said this is not an allergic reaction.
Can anyone give me some insight on this and what I could use to get rid of this crazy outbreak of rashes every now and then….. I really doubt this. But developing rashes might be due to any skin deficiency for which you may have to consult a physician than forming your own conclusions. I don't know about the rash, but I broke out a lot during my first pregnancy. It's not a sure sign, but possible.
My skin was itchy everywhere when I was pregnant. Every woman is different, some break out with bad acne when they get pregnant, and other's clear up. I broke out bad, but if you know your body, then it could be a sign! Which vaccinations are allowed during pregnancy? I'm 13 weeks pregnant and planning to travel to east Africa. Related to gestation: culdoscope , Fetal development. The normal limits of the human gestation period are from 37 weeks days to 42 weeks days ; days and weeks are counted as completed days and weeks.
All rights reserved. The state of a female after conception and until the termination of the gestation. Synonym s : fetation , gestation , gravidism , graviditas. The period of development in the uterus from conception until birth; pregnancy.
Published by Houghton Mifflin Company. Synonym s : gestation. Collins Dictionary of Biology, 3rd ed. Hale, V. Saunders, J. Margham The period from conception to birth, during which the developing fetus is carried in the uterus. Gale Encyclopedia of Medicine. Copyright The Gale Group, Inc. This content is provided by iMedix and is subject to iMedix Terms. The Questions and Answers are not endorsed or recommended and are made available by patients, not doctors. Mentioned in? References in periodicals archive?
Pregnancies that continued till 40 to 41 weeks of gestation had an increased risk of 64 percent stillbirths as compared to deliveries that took place at 37 weeks of gestation period, the researchers found. At sixty days of gestation , fetal sexing it was perform to obtain homogeneous treatments.
Metabolismo preparto y respuestas reproductivas postparto de matrices Nelore suplementadas en diferentes periodos de la gestacion. Biochemical maternal serum markers in second trimester 15th to 18th week of gestation were obtained from pregnant women with single pregnancy for hCG, AFP, Inh A and uE3.
Blood samples were collected from sows through jugular vein into serum separation tubes at d of gestation as well as 24 h and 21 d postpartum and from nursing piglets through anterior vena cava at 24 h and 21 d after birth. Effect of rapeseed meal supplementation to gestation diet on reproductive performance, blood profiles and milk composition of sows. Fonseca, MD, reported in that asymptomatic women with a short cervix defined as 15 mm or less who were randomized to receive vaginal progesterone at a median of 22 weeks' gestation had a significantly lower rate of preterm birth before 34 weeks' gestation than those who received placebo RR, 0.
Is HPC effective for reducing risk of preterm birth? Discordant growth among fetuses comprising the triplet gestation is common. Although hormonal treatments to increase gestation length have been previously described, only recently has the swine industry considered the use of progestagen supplementation to optimize routine husbandry and piglet care, reduce birth weight within-litter variation and prevent premature farrowing.
From January 1 to December 31, , pregnant women were invited to participate if they had an uncomplicated singleton pregnancy between 18 and 41 weeks of gestation with normal fetal growth the estimated fetal weight above the 10[sup]th percentile [sup] , accurate gestational age dating based on the last menstrual period and confirmed with the first trimester ultrasound , and without evidence of a structural defect on ultrasound. Stillbirth is mainly attributed to placental insufficiency and foetal growth restriction.
The onset of TTTS is usually during the second trimester and the majority of deaths occur before 24 weeks of gestation. Evaluation of clinical effect of transabdominal sonography and transvaginal sonography in early diagnosis of ectopic gestation. Among the pre-term births within the study group, women who continued their marijuana use up to 20 weeks of gestation experienced shorter gestations --less than 30 weeks on average--than women who did not use marijuana.
Pot during pregnancy ups pre-term risk. Medical browser? Full browser?