Identifier

etd-11182010-150610

Degree

Master of Science (MS)

Department

Animal Science (Animal, Dairy, and Poultry Sciences)

Document Type

Thesis

Abstract

The duration of frozen semen storage had no effect on pregnancy rates (60%, 61% and 61%, respectively) in Angus females inseminated with semen from 25 Angus bulls from Time Frames 1 (1960-1975), 2 (1976-1991) and 3 (1992-2006). Pregnancy rates were not different for beef females inseminated with semen from Time Frames 1, 2 and 3 (55%, 62% and 55%, respectively). There were no differences for total and progressive sperm motility across Time Frames 1 (42% and 29%), Time Frame 2 (51% and 38%) and Time Frame 3 (55% and 41%) and percentage of normal and abnormal sperm from bulls in Time Frames 1 (80% and 19%), Time Frame 2 (76% and 23%) and Time Frame 3 (71% and 28%). No differences were detected between sperm concentrations/breeding unit for bulls within Time Frame 1 and Time Frame 2 or between Time Frame 1 and Time Frame 3. In contrast, a significant difference (P<0.05) was detected for sperm concentration for bulls within Time Frame 2 (59.9 x 106/mL) and Time Frame 3 (37.1 x 106/mL). Within these bulls regardless of Time Frame, no differences were detected in total sperm and progressive sperm motility for bulls categorized as being high (54% and 41%), moderate (51% and 39%) or low (46% and 31%) fertility rates. Brangus F1 females had higher (P<0.05) chute behavior scores when compared with Bons Mara, Romsinuano, Braford, Brangus, Beefmaster and Angus females. Furthermore, Brangus F1, Brangus and Beemaster females had higher (P<0.05) mean chute exit velocities when compared with Angus, Romosinuano, Bons Mara and Braford females Chute behavior scores were not significantly different for pregnant and nonpregnant females. A significantly higher chute exit velocity was noted for nonpregnant females when compared with pregnant females. Significant correlations (r = 0.58, P <0.05) was detected for chute exit velocity on day 0 and day 7. Furthermore, a significant positive correlation (r = 0.28) was detected between mean subjective behavior chute scores and mean chute exit velocity.

Date

2010

Document Availability at the Time of Submission

Secure the entire work for patent and/or proprietary purposes for a period of one year. Student has submitted appropriate documentation which states: During this period the copyright owner also agrees not to exercise her/his ownership rights, including public use in works, without prior authorization from LSU. At the end of the one year period, either we or LSU may request an automatic extension for one additional year. At the end of the one year secure period (or its extension, if such is requested), the work will be released for access worldwide.

Committee Chair

Gentry, Jr., Glen T.

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