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EFFECTS OF SELECTION FOR BLOOD SERUM INSULIN-LIKE GROWTH FACTOR I CONCENTRATION ON REPRODUCTIVE PERFORMANCE OF FEMALE ANGUS BEEF CATTLE

Zhang, Xinyue
http://rave.ohiolink.edu/etdc/view?acc_num=osu1338413814

Abstract Details

2012, Master of Science, Ohio State University, Animal Sciences.
Reproductive performance of animals affects lifetime productivity. However improvement of reproductive traits via direct selection is generally slow due to low heritability. Therefore, identification of indicator traits for reproductive performance may enhance genetic response. Previous studies showed that serum insulin-like growth factor I (IGF-I) concentration is a candidate indicator for growth and reproductive traits. The objectives of our study were to estimate the (co)variances for IGF-I concentration and reproductive, body composition, and growth traits. Data were collected from a divergent selection experiment for serum IGF-I concentration at the Eastern Agricultural Research Station owned by The Ohio State University. The study included a total of 2,662 calves in the 1989 to 2005 calf crops. (Co)variance components were estimated for genetic effects, maternal environment effects, environment effects, and phenotypic effects using an animal model in multiple-trait, derivative-free, restricted maximum likelihood for and ASReml computer programs. The results of direct additive genetic correlation suggest that selection for greater IGF-I concentration (heritability = 0.50 ± 0.07) could lead to increased conception (heritability = 0.11± 0.06, r = 0.32, P < 0.001) and calving rate (heritability = 0.13 ± 0.06, r = 0.43, P < 0.001), increased d 140 postweaning ribeye area (heritability = 0.63 ± 0.08, r = 0.38, P < 0.001) and weight (heritability = 0.62 ± 0.08, r = 0.15, P < 0.001), and decreased age at first calving in heifers (heritability = 0.35 ± 0.20, r = -0.40, P < 0.001).
Michael Davis (Advisor)
Joseph Ottobre (Committee Member)
Moeller Steven (Committee Member)
Animal Sciences

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Citations

  • Zhang, X. (2012). EFFECTS OF SELECTION FOR BLOOD SERUM INSULIN-LIKE GROWTH FACTOR I CONCENTRATION ON REPRODUCTIVE PERFORMANCE OF FEMALE ANGUS BEEF CATTLE [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1338413814

    APA Style (7th edition)

  • Zhang, Xinyue. EFFECTS OF SELECTION FOR BLOOD SERUM INSULIN-LIKE GROWTH FACTOR I CONCENTRATION ON REPRODUCTIVE PERFORMANCE OF FEMALE ANGUS BEEF CATTLE. 2012. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1338413814.

    MLA Style (8th edition)

  • Zhang, Xinyue. "EFFECTS OF SELECTION FOR BLOOD SERUM INSULIN-LIKE GROWTH FACTOR I CONCENTRATION ON REPRODUCTIVE PERFORMANCE OF FEMALE ANGUS BEEF CATTLE." Master's thesis, Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1338413814

    Chicago Manual of Style (17th edition)

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© 2012, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.