Selection of the best male by females is calledfemale choiceorintersexual selection. In both cases, significant energy is spent in the process of locating, attracting, and mating with the sex partner. For more information about beef cattle reproductive management, contact your localcounty MSU Extension office. This occurs in most bony fish, many reptiles, some cartilaginous fish, most amphibians, two mammals, and all birds. Finally I've found something which helped me. The male-assistance hypothesis is supported by the observation that many monogamous species live in environments with widely scattered resources, meaning that it takes the effort of more than one adult to forage for enough resources to rear the young. Except in the case of sexual (true) monogamy, there isalwayscompetition for fertilization. By Wolfgang Wander, Papa Lima Whiskey (edit) self-made / http://www.pbase.com/wwcsig/image/86468128, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=10230928. The value of the additional calves at weaning is $4,298. Trends in Ecology and Evolution 17, 34-39 (2002). Stoltz, J. The statement above is a gross generalization, but biologically it tends to be true across most species that reproduce sexually, whether they reproduce with internal or external fertilization. Proceedings of the National Academy of Sciences of the United States of America 78, 3721-3725 (1976). Selective breeding has been used for plants and animals that are sources of food, for making animals suitable for specific types of work, for making plants produce certain substances and for decorative effect. Hybrid Animals Are Not Nature's Misfits - The Scientist Hauber, M.E. Science 203, 916-918 In leks, the species has a communal courting area where several males perform elaborate displays for females, and the females choose their mate from the performing males.
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