The influence of initial length of uterus per embryo and gestation stage on prenatal survival, development and sex ratio in the pig
Chen, Zhaoying
This item is only available for download by members of the University of Illinois community. Students, faculty, and staff at the U of I may log in with your NetID and password to view the item. If you are trying to access an Illinois-restricted dissertation or thesis, you can request a copy through your library's Inter-Library Loan office or purchase a copy directly from ProQuest.
Permalink
https://hdl.handle.net/2142/20256
Description
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
Issue Date
1992
Doctoral Committee Chair(s)
Dziuk, Philip J.
Department of Study
Animal Sciences
Discipline
Animal Sciences
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Biology, Animal Physiology
Language
eng
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).
Use this login method if you
don't
have an
@illinois.edu
email address.
(Oops, I do have one)
IDEALS migrated to a new platform on June 23, 2022. If you created
your account prior to this date, you will have to reset your password
using the forgot-password link below.
