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Different genetic systems control presence of the trait vs. number of sides affected; left testes are retained more often in almost all samples. Contrary to previous claims prenatal viability of homozygous males and females is normal. Genes causing cryptorchidism are unlikely to affect many other malformations in either sex, but pleiotropy is suggested to extend to economic traits such as conformation in females.<\/jats:p>","DOI":"10.1139\/g77-053","type":"journal-article","created":{"date-parts":[[2014,11,28]],"date-time":"2014-11-28T20:29:09Z","timestamp":1417206549000},"page":"487-502","source":"Crossref","is-referenced-by-count":5,"title":["SEX-LIMITED AND SEX-MODIFIED GENETIC DEFECTS IN SWINE \u2014 CRYPTORCHIDISM"],"prefix":"10.1139","volume":"19","author":[{"given":"K.","family":"Sittmann","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"B.","family":"Woodhouse","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"155","reference":[{"key":"p_3\/p_3_1","first-page":"29","volume":"1","author":"Biggers J. D.","year":"1966","journal-title":"Adv. Wegrod. 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