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Bedding Application And Increasing Dosage Of Trenbolone Acetate And Estradiol In Implants For Beef Steers: Influence On Growth Performance, Carcass Characteristics, And Circulating Metabolite Responses, Dathan T. Smerchek
Electronic Theses and Dissertations
Three randomized complete block design feedlot experiments were conducted over the course of two years. Two experiments were conducted to investigate the effect of bedding use in confined beef steers. The third experiment evaluated the effects of implants containing increasing doses of trenbolone acetate (TBA) and estradiol benzoate (EB) in confined beef steers. Experiment 1 used Simmental × Angus steers (n = 240; initial body weight (BW) = 365 ± 22.5 kg). Experiment 2 used newly weaned Charolais × Red Angus steers (n = 162; initial BW = 278 ± 13.4 kg). Steers were allotted to 1 of 2 treatments: …
The Influence Of Preovulatory Estradiol On Uterine Transcriptomics And Proteomics Around Maternal Recognition Of Pregnancy In Beef Cattle, Emmalee J. Northrop
The Influence Of Preovulatory Estradiol On Uterine Transcriptomics And Proteomics Around Maternal Recognition Of Pregnancy In Beef Cattle, Emmalee J. Northrop
Electronic Theses and Dissertations
Preovulatory estradiol has been reported to play a crucial role in pregnancy establishment and maintenance, but the mechanism by which estradiol exerts its effects has not been well characterized. Specifically, the interactions between the maternal uterine environment and the developing conceptus can greatly impact pregnancy success or loss. The objective of this dissertation is to determine the effects of preovulatory estradiol exposure on uterine and trophectoderm transcriptomes, and uterine luminal fluid (ULF) protein composition. Beef cows/heifers were synchronized, artificially inseminated (d 0), and grouped into either high (highE2) or low (lowE2) preovulatory estradiol. Uteri were flushed to collect d16 conceptuses …