Prediction of embryo transfer pregnancy rate in Bos Taurus and Bos Indicus cattle /
The analysis of embryo transfer data and prediction of embryo transfer pregnancy rate in Bos Taurus and Bos Indicus cattle in 392 embryo transfers were evaluated by using the Chi Square Test of Independence and Logistic Regression Analysis. The basic model included the main effects of fresh vs. froz...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1995.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=742162471&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | The analysis of embryo transfer data and prediction of embryo transfer pregnancy rate in Bos Taurus and Bos Indicus cattle in 392 embryo transfers were evaluated by using the Chi Square Test of Independence and Logistic Regression Analysis. The basic model included the main effects of fresh vs. frozen, quality and genetic parent of the embryo and season of the transfer. Fresh vs. frozen (p<.001) and quality (p<.001) of the embryo were highly significant. The transfer of fresh and frozen embryos resulted in a 70.5% and 44.79% pregnancy and the pregnancy for quality grades 1, 2 and 3 were 66.26%, 53.5% and 41.38% respectively. Seasonal influence on embryo transfer performance (p<.05) was lower during the winter (48.05%) and higher during the spring (64.29%). Embryos from Brahman females and Fl Brahman X Angus bulls were lower in pregnancy rate (46.88%) as compared to embryos from Angus females, Angus bulls and Brahman bulls (64.20%, 60.82% and 60.70% respectively) with the reciprocal parent a Brahman X Angus F, (P<.08). This distribution of embryo quality by parent is highly significant (p<. 001) . The embryos from the Brahman cow produced the lowest number of quality 1 embryos and had the lowest conception rate after freezing when compared to embryos from the Angus cow, Angus bull and Brahman bull. As the amount of Brahman inheritance in the donor female increases, the percent conception in the recipient increases. As a result of these data, two probability tables were developed to predict pregnancy rate ranging from an 89% to 13% probability. These data established the concept of factors intrinsic and extrinsic to Bos Taurus and Bos Indicus embryos affecting pregnancy rates. |
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| Item Description: | Vita. "Major Subject: Animal Science". |
| Physical Description: | vii, 83 leaves ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references. |