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The gestation period ranges between 21 and 29 days and young rats are able to reproduce within 3 to 5 months of their birth. 6 With eyes on either side of their head that can move in opposite directions rats are even able to see whats happening above them.
Pet rats are available in several colors and coat patterns because of specialized breeding.
Rats reproduction description. Breeding and reproduction in rats can decrease because of factors such as age malnutrition abnormal light cycles cold environment cysts on the ovaries tumors and inadequate nesting material. Pregnant females may abort abandon or eat their babies because of inadequate food lack of water overcrowding in group housing inadequate nesting materials sick or deformed. The male rat has 5 pairs of accessory sex glands.
The secretions of these glands serve to nourish and activate the sperm to clear the urethral tract prior to ejaculation serve as a means of transporting the sperm in the female tract and to create a copulatory plug to help ensure fertilization. The reproductive system also supplies nourishment for the offspring after birth and produces female sex hormones. The main system structures of the female rat are the vagina ovaries uterus and mammary glands.
The vagina is the short muscular canal that leads from the female rats uterus to the outside of the body. Females are polyestrous and ovulate spontaneously. Breeding is largely determined by food availability.
Litter size normally 6 - 11 gestation is 21-24 days young weaned at about 28 days. Females can be sexually active. They are about 9 to 11 inches long without the tail.
Male rats are usually larger than females. Pet rats are available in several colors and coat patterns because of specialized breeding. The common color variations include brown black tan gray and white with both lighter and darker shades as well.
Some of the more exotic colors are. Rat pups are born 45-6 g affected by litter size eyes will open at 14-17 days and ears at 25-35 days. They are hairless fully haired 7-10 days and with no erupted.
The female reproductive organs of rat are uterine horns below kidney oviduct tiny tube that connects uterine horn to ovary and ovary. Taxonomically rat and mouse are not different species. The former differs from the latter by its larger size.
Rats brush the long hairs against objects or the floor helping them build up a detailed picture of their environment. 6 With eyes on either side of their head that can move in opposite directions rats are even able to see whats happening above them. True rats are omnivorous capable of eating a wide range of plant and animal foods and have a very high birth rate.
When introduced to a new area they quickly reproduce to take advantage of the new food supply. Rat reproduction has been most intensively studied in the brown rat. This prolific rodent reaches sexual maturity at three months and may produce up to 12 litters of 2 to 22 young 8 or 9 is usual per year with peaks in the spring and autumn and a gestation period of 21 to 26 days.
The brown rat Rattus norvegicus also known as the common rat street rat sewer rat wharf rat Hanover rat Norway rat Norwegian rat and Parisian rat is a widespread species of common ratOne of the largest muroids it is a brown or grey rodent with a head and body length of up to 28 cm 11 in long and a tail slightly shorter than that. It weighs between 140 and 500 g 5 and 17. The peak breeding seasons are summer and autumn.
Females can produce up to 5 litters in one year. The gestation period ranges between 21 and 29 days and young rats are able to reproduce within 3 to 5 months of their birth. Neonates are altricial like most rodents and their eyes do not open until 15 days of age.
Rats begin breeding as soon as five weeks of age and continue until about age two. Females are fertile approximately every three weeks and during this time they have been known to mate up to 500 times in six hours. Female urogenital structures Urethral orifice- is the opening into the urethra part of the urinary system.
Vaginal orifice- is the opening into the vagina part of the reproductive system. Male urogenital structures Penis - is hidden on the male rat beneath a. The major reproductive organs of the male rat are the testes singular.
Testis which are located in the scrotal sac. Cut through the sac carefully to reveal the testis. General Biology and Reproduction of Kangaroo Rats.
Kangaroo rats conduct breeding from February to October in southern desert states. The breeding period is somewhat shorter in the northern states. The gestation period is estimated at 30 days.
Reproductive rates differ as per species food accessibility and density of rodent populations. Male rats were divided into. A control group–rats receiving vehicle olive oil for 60 days and treatment group–rats receiving cholesterol diet for a reproductive cycle.
Animals were weighed. An average female is capable of giving birth approximately seven times per year. Around 18 hours after giving birth females experience postpartum estrus and mate again.
This reproductive function is responsible for the huge birthrates of Norway rats which can reach 60 young each year per female. The laboratory rat has long been used in experimental physiology and has made significant contributions to several complex areas of mammalian biology. This chapter presents the taxonomy of laboratory rat and discusses its stocks and strains.
Rats are rodents and thus members of the largest family of mammals. Approximately 1325 living species.