page_title: Rabbit
section_title: Reproduction
hierarchical_section_title: Rabbit / Biology / Reproduction
caption_attribution_description: English: Labeled diagram of the reproductive system of a female dog drawn by J. Ruth Lawson, Otago Polytechnic, Dunedin, New Zealand, 2008.
context_page_description: Rabbits are small mammals in the family Leporidae of the order Lagomorpha. Oryctolagus cuniculus includes the European rabbit species and its descendants, the world's 305 breeds of domestic rabbit. Sylvilagus includes 13 wild rabbit species, among them the seven types of cottontail. The European rabbit, which has been introduced on every continent except Antarctica, is familiar throughout the world as a wild prey animal and as a domesticated form of livestock and pet. With its widespread effect on ecologies and cultures, the rabbit is, in many areas of the world, a part of daily life—as food, clothing, a companion, and a source of artistic inspiration.
  Although once considered rodents, lagomorphs like rabbits have been discovered to have diverged separately and earlier than their rodent cousins, and have a number of traits rodents lack, like two extra incisors.
context_section_description: The adult male reproductive system forms the same as most mammals with the seminiferous tubular compartment containing the Sertoli cells and an adluminal compartment that contains the Leydig cells. The Leydig cells produce testosterone, which maintains libido and creates secondary sex characteristics such as the genital tubercle and penis. The Sertoli cells triggers the production of Anti-Müllerian duct hormone, which absorbs the Müllerian duct. In an adult male rabbit, the sheath of the penis is cylinder-like and can be extruded as early as two months of age. The scrotal sacs lay lateral to the penis and contain epididymal fat pads which protect the testes. Between 10–14 weeks, the testes descend and are able to retract into the pelvic cavity in order to thermoregulate. Furthermore, the secondary sex characteristics, such as the testes, are complex and secrete many compounds. These compounds includes fructose, citric acid, minerals, and a uniquely high amount of catalase.
  The adult female reproductive tract is bipartite, which prevents an embryo from translocating between uteri. The two uterine horns communicate to two cervixes and forms one vaginal canal. Along with being bipartite, the female rabbit does not go through an estrus cycle, which causes mating induced ovulation.
  The average female rabbit becomes sexually mature at 3 to 8 months of age and can conceive at any time of the year for the duration of her life. However, egg and sperm production can begin to decline after three years. During mating, the male rabbit will mount the female rabbit from behind and insert his penis into the female and make rapid pelvic hip thrusts. The encounter lasts only 20–40 seconds and after, the male will throw himself backwards off the female.
  The rabbit gestation period is short and ranges from 28 to 36 days with an average period of 31 days. A longer gestation period will generally yield a smaller litter while shorter gestation periods will give birth to a larger litter. The size of a single litter can range from four to 12 kits allowing a female to deliver up to 60 new kits a year. After birth, the female can become pregnant again as early as the next day.
  The mortality rates of embryos are high in rabbits and can be due to infection, trauma, poor nutrition and environmental stress so a high fertility rate is necessary to counter this.
caption: Diagram of the female rabbit reproductive system with main components labeled.
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