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 Title: The influence of initial length of uterus per embryo and gestation stage on prenatal survival, development and sex ratio in the pig Author(s): Chen, Zhaoying Doctoral Committee Chair(s): Dziuk, Philip J. Department / Program: Animal Sciences Discipline: Animal Sciences Degree Granting Institution: University of Illinois at Urbana-Champaign Degree: Ph.D. Genre: Dissertation Subject(s): Biology, Animal Physiology Abstract: The effects of initial uterine length per embryo and stage of gestation on embryonic survival, development and sex ratio were determined by systematically restricting embryos to 5, 10, 15, 20, 25, 30, 35, 40, 45 or more than 50 cm of initial uterine length per potential embryo and examining the reproductive tracts at d 17, 23, 29, 35 or 41 of gestation. At d 3 the mean length of a uterine horn was 169 $\pm$ 35 cm with a range of 80 to 255 cm. The mean number of corpora lutea (CL) was 12.4 $\pm$ 2.34 from both ovaries. Ovulation rate was positively correlated with the length of uterine horns (r =.3769). Prenatal survival rate was highly correlated with initial allotted uterine space from 5 to 25 cm/CL (r =.95, p .1) and when embryos were restricted to 15 cm to above, sex ratio of male to female was 49:51. Stage of gestation had little effect on sex ratio. Male fetuses occupied more uterine space than females in both crowded and roomy sections (p $<$.05). At d 41 males were lighter than females in crowded sections (male 10.17 gm, female 11.56 gm) but heavier than females in sections with assigned space greater than 25 cm/CL (male 12.91 gm, female 12.05 gm) (p $<$.05). Issue Date: 1992 Type: Text Language: English URI: http://hdl.handle.net/2142/20256 Rights Information: Copyright 1992 Chen, Zhaoying Date Available in IDEALS: 2011-05-07 Identifier in Online Catalog: AAI9236422 OCLC Identifier: (UMI)AAI9236422
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