Mouse pregnancy experiment Topic: The weight increase of the female mouse and fetus during pregnancy. Problem: At what rate does a female mouse gain weight during pregnancy? Background information: • Unlike humans, mice bear multiple young. • The fetus grows by cells dividing at approximately an exponential rate. • The fetus develops the most during the first trimester. Hypothesis: If a healthy female mouse gets pregnant, then excluding the weight she gains from simply growing, she will gain weight at a bit less than an exponential rate. Operational definitions: • Pregnant o The state in which an animal has developing young growing in the uterus. • Exponential rate o The rate at which a number increases if exponents are applied. Increases rapidly. • The weight gained from growing o The weight a being gains with no outside cause. • Pups o Baby mice Experimental design: N/A Materials: • One female mouse that is fertile • One male mouse that is fertile • A 100 gram scale • Pencil and paper to record data • Mouse care materials o Three mouse cages o Mouse bedding o Food o Water bottle made for small animals o Exercise wheel o Any toys / accessories Lab safety and protocol: • MAKE SURE TO FIND LOVING HOMES FOR ALL THE BABIE MICE! • BE HUMANE TO MICE! • Do not pick up pregnant mouse by belly or the tail, the tail can come off • Sex the baby mice as soon as they are weaned. Separate the males into another cage (not the one with the father). • Handle mice with care, they may bite o Do not squeeze o Do not grab o Do not dangle by tail unless necessary • Do not allow pregnant mouse to smell any male mouse other than her mate or she will abort her litter Variables and constan... ... middle of paper ... ...how much she gains/losses weight, and estimate how much weight the babies actually weighed. The most insignificant change that I would make is to have a younger male mouse. I hoped to learn: • If the weight increase of the female is constant throughout. • The rate of increase • Capacity of uterus expansion • I wanted to learn what percentage of the female’s weight gain was from babies, how much from the placenta and amniotic fluids and how much weight the mother’s body itself gained. I couldn’t check this because if the babies were handled too soon, the mother would reject and eat them. I actually learned: • Even though mice reproduce so rapidly, it is still not 100% certain that pregnancy will occur • That because mice are so small, the daily weight gain is, on average, about 6% of their whole body weight. • Stress and environment influence weight a lot
Abstract: The objectives of this lab was to identify the internal and external anatomy of the fetal pig. The experiment was conducted by dissecting a fetal pig and actively seeing the external anatomy, Oral Cavity, Digestive System, Circulatory System, Respiratory System, Urogenital System, and Nervous System.
1These two populations are different species because they have different capabilities of performing in nature. For example there is behavioral isolation. My evidence for that is that in the data, it states that the average time spent in courtship display for the St. Kitts rodent is 12.6 seconds. While the courtship display for the Nevis Rodent is 21.3. You can see that there is a major difference in the way that they behave. Also there is another type of isolation which is gametic isolation. There is gametic isolation because the average gestation time for St. Kitts rodent is 29.3 days. The average gestation for the Nevis rodent is 42.7 days. Therefore a sperm from St. Kitts rodent wouldn’t survive in the reproductive tract of the Nevis rodent. It wouldn’t survive because it wouldn’t develop properly and is not accustomed to its environment. There is also another type of isolation happening with the rodents of St. Kitts. This type of isolation is called temporal isolation. There is temporal isolation because the article states, “the reproductive seasons are being delayed by up to one year.” This is talking about that the rodents are having a hard time finding mates therefore, their reproductive season is being delayed. Also in the article it states, “In the 240 attempts to bring a Nevis animal into the St. Kitts population, you are unable to observe a single successful reproductive event.” The rodents are mechanically isolated, because if you can’t have a reproductive event, there reproductive organs might not be matching with one another. Their appearance might look identical but they are genetically different.
I didn't kill it. Honest I found it. I found it dead." The dead mouse is also an allusion to the novel's title, a reminder that dreams will go wrong, even petting a mouse.
Keep animals and pets away from the child, as they may cause direct harm to the child, or cause allergies to the child.9.
A normal cold winter night made an unusual turn when little kitten cries were heard coming from the side of the Livingston First Baptist Church. Then, a mom cat was spotted on the side of the building trying to keep her kitten and herself warm, fed and healthy. The mom cat was skin and bones, as she was fighting the cold and nursing her litter of kittens.
Researching on mice was began in a Laboratory in Bar Harbor in Maine. In the year of 1953, researcher Leroy Stevens began on an experiment with cancerous mice. This laboratory was awa...
"Rodents." Centers for Disease Control and Prevention. Centers for Disease Control and Prevention, 29 July 2010. Web. 8 Mar. 2014.
Lack of funding was the main reason the mouse's existence was in jeopardy. While working on the preliminary research and development of the mouse, Engelbart discovered that they could not afford to bring in outside experience and resources that were necessary for the project. The funds that he had...
There is no way to prevent these from happening. The only thing you can do is help early detection of the lump by feeling your guinea pigs every so often to see if you feel any lumps or bumps. If you notice any lumps have your veterinarian examine the lump as soon as possible.
The first step was to obtain the White Rat and to tie it in the supine position, anterior surface facing up in side the dissection pan. To tie the animal, we used butcher’s twine and secured the front and hinds legs using a “lasso” technique, careful not touch the sharp claws. To make the first insicion I had to locate the Xifoid Process of the rat (distal aspect of the sternum). Once I had located the Xifoid Process, I had to use forceps to pull the skin of the animal’s abdomen up and use the scissors to cut. The first incision is made from stem to sternum, cutting through the errectos abdomen muscle down to the groin. The second incision ion is perpendicular to the first below the diaphragm. Because of this technique we were able to open the abdominal cavity first. The third and forth incisions were made bilaterally above the legs. The last two incisions were made in upside down “V” shape on the collarbone, to expose the thoracic cavity. This dissection was both sharp, because of the use of the scissors and scapel and blunt because of the use of the probe and forceps to move organs and skin to expose other organs not yet identified.
We start our services off with a thorough inspection of the entire home. In our mouse proofing we find and seal off all access point that mice might have. Whether it be a chewed hole or a building imperfection. We will find it and repair it. Although many company claims they are the best at finding and solving these problems. We know better after all we end up fixing many mistakes made by others. Understanding that mice are sneaky and great contortionist will help you find their entry points. Our years of experience have taught us never to underestimate the mouse and its sneaky abilities. Standard rules say a mouse fits into a quarter size hole or ½ inch hole. Experience has told us rats don't care what size the hole is, after all they can
Also let them roam around the room, but keep a close eye on them, just incase they decide to chew on cords, or find something they aren't supposed to get into. Guinea pigs will get depressed if they are confined in a small environment, or if they are alone. Make sure to buy guinea pigs two at a time. If You buy different guinea pigs and put them in the same cage, they’ll either mate, then kill each other, or just flat out eat one another. . It is also wise to clean the cage once or twice a week to keep the cage from smelling.
Hamsters are rodents and are distant relatives of mice and rats. Hamsters are small, almost tailless, relatively clean, affordable, easy to care for, and a popular pet. Reproduction among hamsters takes place during the stage of life between puberty and menopause. Laboratory animals aren’t usually mated at the first estrous because during puberty even though the animals are capable of reproduction, the female hamsters will not have attained mature body size, gestation, and lactation tend to delay their
On the average, a newborn baby weighs 3.4 kg (7.5 lb) and is 53 cm (21 in) long, with the head disproportionately larger than the lower part of the body. As the child grows, increments in height are greatest from birth to three years; thereafter they are relatively constant until adolescence. The growth spurt at adolescence is far less than during infancy. Weight increments are also large during the first three years but are equally large during adolescence. Research shows that growth rates are influenced by the health of the child. Rates of development decelerate during illness; after an illness is cured, however, growth rates accelerate until children attain their appropriate height and weight.
Handling and caring for rodents (including hamsters and gerbils) or even fish, puts humans at risk for the below-mentioned infections.