2008年9月16日星期二

Kitten Vaccinations: Types of Vaccinations

In recent years, the vaccination of cats has become more popular. The three most common vaccines give protection against feline infectious enteritis (FIE), feline influenza (cat flu) and feline leukaemia (FeLV). An initial course of two injections, the first at nine weeks are usually given, and yearly boosters are recommended thereafter.

FIE causes vomiting and diarrhoea, and the cat develops a very high tenperature. Before the vaccine was introduced, it killed a great many cats by dehydration due to the bowel symptoms. Cat flu is caused by two viruses: the feline rhinotracheitis (FCV). FVR is the more severe of the two, causing coughing, sneezing, and nasal and eye discharges.

FVC has milder discharges but more gum inflammation and mouth ulcers. Neither FCV nor FVR is usually deadly but the infection can linger on in the form of snuffles, and some cats become symptomless carriers of the disease. When stressed, these cats develop mild symptoms and spread the virus.

FeLV suppresses the activity of the cat's immune system, allowing a wide range of symptoms to develop. It often results in the death of the cat after several months of illness. The virus is spread mainly in the cat's saliva. It is a disease of cats that fight a lot, and of cats in large colonies, who share the same food and water bowls. It should not be a threat in a well-run boarding cattery, where the feeding and grooming utensils are properly cleaned, and the cats do not mix with each other.

A vaccine exists against the chlamydial organism, which can cause not only mild eye and nasal symptoms, but more importantly, infertility and abortion. This vacine is used mainly in breeding colonies to protect against infertility.

2008年9月4日星期四

Turtles Swallows


Sea turtles are large, air-breathing reptiles that inhabit tropical and subtropical seas throughout the world. Their shells consist of an upper part (carapace) and a lower section (plastron). Hard scales (or scutes) cover all but the leatherback, and the number and arrangement of these scutes can be used to determine the species.


turtles

turtles are reptiles of the Order Testudines , most of whose body is shielded by a special bony or cartilaginous shell developed from their ribs. The Order Testudines includes both extant (living) and extinct species. The earliest known turtles date from 215 million years ago, making turtles one of the oldest reptile groups and a more ancient group than lizards and snakes. About 300 species are alive today, and some are highly endangered.

Sea turtles come in many different sizes, shapes and colors. The olive ridley is usually less than 100 pounds, while the leatherback typically ranges from 650 to 1,300 pounds! The upper shell, or carapace, of each sea turtle species ranges in length, color, shape and arrangement of scales.

Sea turtles do not have teeth, but their jaws have modified “beaks” suited to their particular diet. They do not have visible ears but have eardrums covered by skin. They hear best at low frequencies, and their sense of smell is excellent. Their vision underwater is good, but they are nearsighted out of water. Their streamlined bodies and large flippers make them remarkably adapted to life at sea. However, sea turtles maintain close ties to land.

turtles cannot breathe in water, but they can hold their breath for various periods of time.

Females must come ashore to lay their eggs in the sand; therefore, all sea turtles begin their lives as tiny hatchlings on land. Research on marine turtles has uncovered many facts about these ancient creatures. Most of this research has been focused on nesting females and hatchlings emerging from the nest, largely because they are the easiest to find and study.

Thousands of sea turtles around the world have been tagged to help collect information about their growth rates, reproductive cycles and migration routes.

Like other reptiles, turtles are poikilothermic . Like other amniotes, they breathe air and do not lay eggs underwater, although many species live in or around water. The largest turtles are aquatic.After decades of studying sea turtles, much has been learned. However, many mysteries still remain.

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