Avian - Reproductive System 0.0 / 5 ? OtherAnimal ManagementOtherOther Created by: Becky_BerryCreated on: 30-01-21 10:27 Reproductive System 97% of bird species do not have an external penis watefowl have an extruding penis and this is likely an adaptation to ensure the sperm isn't washed away allowing them to fertilise the egg 1 of 7 Female Reproductive System Only have one ovary only the left ovary and oviduct develops Ovary Infundibulum: fertilisation occurs here When it gets a yolk membrane it gets a shallow iverous layer of albulum and that builds up. Glandular magnum: thick layer of clear liquid is secreted along with various minerals for the development of the egg. Isthumus Uterus: where the majority of the development happens, spends roughly 25 hours here, spends 7 hours getting to the uterus 2 of 7 Male Reproductive System testes within the body located around the kidneys still have testosterone stimulates the growth and development of the reproductive system 2 testes both testicles are developed and functional ductus deferens is the storage area for sperm 3 of 7 Potential Problems fertility problems as age increases sperm and egg production decrease as well as mating activity typically, an increase in early embryo death when eggs come from older birds need to find a suitable mate 4 of 7 Sexual Selection When one parent invests more into the offspring and tend to be choosier about which mate they select the opposite sex will then compete with each other to be chosen intraspecific competition leads to sexual dimorphism fisherian runaway selection resulting in overly exaggerated characteristics most common in Aves 5 of 7 Avian Mating Systems Polygamy/Polygynandry: each adult may mate with more than one member of the opposite sex Promiscuous: males and females both mate with multiple members of the other sex Monogamy: each adult mates with only one member of the other sex Polygyny: females mate with a large number of males Polyandry: males mate with a large number of females 6 of 7 Altricial or Precocial Altricial: young which hatch at an early stage of development and require care and feeding from parents. Precocial: young which hatch at an advanced stage and are able to feed themselves almost immediately. 7 of 7
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