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You searched for +publisher:"Colorado State University" +contributor:("Holt, Tim"). Showing records 1 – 3 of 3 total matches.

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1. Doubet, Curtis. Effects of direct-fed microbials on weight gain and gastrointestinal bacteria microbiome composition in weaned heifers.

Degree: MS(M.S.), Animal Sciences, 2019, Colorado State University

Weight gain and fecal analysis on 179 heifer from two breeds of cattle, Angus and Salers, were analyzed after being treated with a direct fed microbial (DFM) supplement. Heifers were split into one of three treatment groups with the control being drenched with water, a second group being drenched with 1/2oz of the DFM, and a third group being drenched with 1oz of the DFM. Heifers were monitored over a four week period and drenched on day 0 and day 28 to measure changes in weight gain and microbiome composition. Fecal samples were taken rectally from the fecal group (FG) weekly during the duration of the trial. Overall, the final model ANOVA resulted in a p-value of .9689, concluding no significant difference between the 3 treatment levels for weight gain. Time proved to be the predominant driver of gastro-intestinal microbial composition and probiotic supplementation did not lead to significant changes to the microbiome community structure. Chao1 and ACE models ran on fecal samples indicate significant impact of probiotic treatment on microbial richness and indicate that supplementation leads to greater diversity and, in turn, may mean a more robust microbiome. Advisors/Committee Members: Pond, Kevin (advisor), Engle, Terry (committee member), Holt, Tim (committee member).

Subjects/Keywords: gastro-intestinal microbiome; direct-fed microbial; probiotic supplementation

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APA (6th Edition):

Doubet, C. (2019). Effects of direct-fed microbials on weight gain and gastrointestinal bacteria microbiome composition in weaned heifers. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/195240

Chicago Manual of Style (16th Edition):

Doubet, Curtis. “Effects of direct-fed microbials on weight gain and gastrointestinal bacteria microbiome composition in weaned heifers.” 2019. Masters Thesis, Colorado State University. Accessed April 14, 2021. http://hdl.handle.net/10217/195240.

MLA Handbook (7th Edition):

Doubet, Curtis. “Effects of direct-fed microbials on weight gain and gastrointestinal bacteria microbiome composition in weaned heifers.” 2019. Web. 14 Apr 2021.

Vancouver:

Doubet C. Effects of direct-fed microbials on weight gain and gastrointestinal bacteria microbiome composition in weaned heifers. [Internet] [Masters thesis]. Colorado State University; 2019. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/10217/195240.

Council of Science Editors:

Doubet C. Effects of direct-fed microbials on weight gain and gastrointestinal bacteria microbiome composition in weaned heifers. [Masters Thesis]. Colorado State University; 2019. Available from: http://hdl.handle.net/10217/195240


Colorado State University

2. Briggs, Emma. Evaluating the genetic relationship between high elevation pulmonary arterial pressure and moderate elevation feedlot performance and carcass traits.

Degree: MS(M.S.), Animal Sciences, 2020, Colorado State University

The objective of the study was to evaluate if a genetic relationship exists between post weaning pulmonary arterial pressure (PAP) measured at high elevation and traits associated with moderate elevation feedlot performance and carcass traits. For this study, PAP (collected 1992-2018; n = 6,898), feedlot performance (2014-2018; n = 558), and carcass data (2001-2018; n = 1627) were obtained from the Colorado State University Beef Improvement Center Angus herd. At an elevation of 2,115 m, post weaning, PAP measurements were collected; subsequently, a selected group of steers were relocated to a moderate elevation feedlot (1,500 m) where feedlot performance data was collected. Genetic relationships were evaluated with a series of 5-trait models using REML statistical approaches. Traits in this analysis were assigned contemporary groups, fixed effects and a direct genetic random effect. A maternal additive and permanent environmental effect was included to weaning weight in the analysis. The heritability estimate for PAP was 0.20 ± 0.03. Genetic correlations between PAP and feedlot traits were positive, with estimates of 0.32 ± 0.20 (average dry matter intake) and 0.03 ± 0.17 (average daily gain). The strongest genetic correlation between PAP and carcass performance traits were those of rib eye area (-0.30 ± 0.12) and calculated yield grade (0.29 ± 0.12). Genetic correlations between PAP and marbling score, back fat, or hot carcass weight were 0.00 ± 0.13, -0.07 ± 0.13, and 0.14 ± 0.10, respectfully. These results suggest a favorable genetic relationship exists between PAP and feedlot and carcass traits. As cattle with lower post-weaning PAP move to lower elevation feedlot, they could potently have heavier muscled carcasses compared to their high PAP contemporaries. Advisors/Committee Members: Speidel, Scott E. (advisor), Enns, R. Mark (advisor), Thomas, Milt G. (committee member), Holt, Tim (committee member).

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Briggs, E. (2020). Evaluating the genetic relationship between high elevation pulmonary arterial pressure and moderate elevation feedlot performance and carcass traits. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/212055

Chicago Manual of Style (16th Edition):

Briggs, Emma. “Evaluating the genetic relationship between high elevation pulmonary arterial pressure and moderate elevation feedlot performance and carcass traits.” 2020. Masters Thesis, Colorado State University. Accessed April 14, 2021. http://hdl.handle.net/10217/212055.

MLA Handbook (7th Edition):

Briggs, Emma. “Evaluating the genetic relationship between high elevation pulmonary arterial pressure and moderate elevation feedlot performance and carcass traits.” 2020. Web. 14 Apr 2021.

Vancouver:

Briggs E. Evaluating the genetic relationship between high elevation pulmonary arterial pressure and moderate elevation feedlot performance and carcass traits. [Internet] [Masters thesis]. Colorado State University; 2020. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/10217/212055.

Council of Science Editors:

Briggs E. Evaluating the genetic relationship between high elevation pulmonary arterial pressure and moderate elevation feedlot performance and carcass traits. [Masters Thesis]. Colorado State University; 2020. Available from: http://hdl.handle.net/10217/212055


Colorado State University

3. Bigler, Bo. Effects of monensin sodium and plant extracts containing cinnamaldehyde, capsicum oleoresin, and eugenol on days to puberty, gain, pregnancy rate, and feed efficiency in developing beef heifers receiving a high roughage diet.

Degree: MS(M.S.), Animal Sciences, 2014, Colorado State University

To view the abstract, please see the full text of the document. Advisors/Committee Members: Peel, Kraig (advisor), Ahola, Jason (advisor), Whittier, Jack (committee member), Holt, Tim (committee member).

Subjects/Keywords: average daily gain; beef heifers; monensin; plant extracts; puberty

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Bigler, B. (2014). Effects of monensin sodium and plant extracts containing cinnamaldehyde, capsicum oleoresin, and eugenol on days to puberty, gain, pregnancy rate, and feed efficiency in developing beef heifers receiving a high roughage diet. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/82544

Chicago Manual of Style (16th Edition):

Bigler, Bo. “Effects of monensin sodium and plant extracts containing cinnamaldehyde, capsicum oleoresin, and eugenol on days to puberty, gain, pregnancy rate, and feed efficiency in developing beef heifers receiving a high roughage diet.” 2014. Masters Thesis, Colorado State University. Accessed April 14, 2021. http://hdl.handle.net/10217/82544.

MLA Handbook (7th Edition):

Bigler, Bo. “Effects of monensin sodium and plant extracts containing cinnamaldehyde, capsicum oleoresin, and eugenol on days to puberty, gain, pregnancy rate, and feed efficiency in developing beef heifers receiving a high roughage diet.” 2014. Web. 14 Apr 2021.

Vancouver:

Bigler B. Effects of monensin sodium and plant extracts containing cinnamaldehyde, capsicum oleoresin, and eugenol on days to puberty, gain, pregnancy rate, and feed efficiency in developing beef heifers receiving a high roughage diet. [Internet] [Masters thesis]. Colorado State University; 2014. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/10217/82544.

Council of Science Editors:

Bigler B. Effects of monensin sodium and plant extracts containing cinnamaldehyde, capsicum oleoresin, and eugenol on days to puberty, gain, pregnancy rate, and feed efficiency in developing beef heifers receiving a high roughage diet. [Masters Thesis]. Colorado State University; 2014. Available from: http://hdl.handle.net/10217/82544

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