+publisher:"Colorado State University" +contributor:("Whittier, Jack C.")

Colorado State University

1. Villalobos, Luis Alonso. Annual cool-season forage systems for fall grazing by cattle.

Degree: PhD, Soil and Crop Sciences, 2015, Colorado State University

► Extending the grazing season is one method that beef producers can use to reduce the need for preserved forages and supplements as these are the… (more)

▼ Extending the grazing season is one method that beef producers can use to reduce the need for preserved forages and supplements as these are the major inputs influencing profitability of their operations. Annual forages planted during mid- to late-summer have great potential for extending the grazing season into the fall and early winter in northern Colorado and similar environments. The development of forage systems for livestock operations must start with selection of forage species/cultivars that can yield enough biomass and have a high enough nutritive value to meet the requirements of the livestock to be fed. Accordingly, the research in this dissertation started with an evaluation of nine forage brassica cultivars from which four were chosen based on their unique traits. Barnapoli rape (Brassica napus L. var. napus) had the highest yields and stood up under a snow load; Groundhog radish (Raphanus sativus var.oleifer Strokes) and Barkant turnip (Brassicas rapa L. var. rapa) had fast growth and their bulbs provided extra feed and penetrated the soil, potentially reducing compaction; and Pasja hybrid (Chinese cabbage [Brassica rapa L. chinensis] x Turnip hybrid) had a high leaf-to-stem ratio which provided high quality forage for beef cattle. These were combined in a four-way mixture and evaluated in subsequent studies. In addition, the above study evaluated the impact of planting date on resulting yields of the brassicas and determined that they need to be planted by mid- to late-July to yield high amounts of biomass that can be stockpiled for fall grazing. The nutritive value of the brassicas was high and did not decline over time, but they were very low in fiber which can create rumen upset for beef cattle grazing them in monocultures or in brassica only mixtures. To develop a more balanced diet for beef cattle, the brassica mixture was seeded with cool-season grasses (triticale [×Triticosecale Wittm ex A. Camus {Secale x Triticum}], winter wheat [Triticum aestivum L.], and barley [Hordeum vulgare L.]) following a warm-season hay crop (pearl millet [Pennisetum glaucum L.]) that was either controlled or allowed to regrow. When the latter was controlled by spraying, brassicas dominated the mixtures to the detriment of the cool-season grasses which contributed little to available dry matter. The seed proportions of the cool-season grasses within the mixture were much lower than those used when grown in monocultures. When the proportions of cool-season grasses within mixtures were increased, their contribution to yield increased. Oats (Avena sativa) were particularly competitive when grown with the brassica mix. When the millet was allowed to regrow, it dominated the available dry matter, which influenced overall yield and nutritive value of the mixtures. Mixtures of cool-season forages and millet regrowth had lower quality than the same mixtures grown where the millet was controlled. This resulted from the brassicas dominating the mixtures where the millet regrowth was controlled, which resulted in higher quality… Advisors/Committee Members: Brummer, Joe E. (advisor), Davis, Jessica G. (committee member), Whittier, Jack C. (committee member), Meiman, Paul (committee member).

Subjects/Keywords: annual crops; beef cattle; cool-season; cover crops; forages; grass

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APA (6^th Edition):

Villalobos, L. A. (2015). Annual cool-season forage systems for fall grazing by cattle. (Doctoral Dissertation). Colorado State University. Retrieved from http://hdl.handle.net/10217/170422

Chicago Manual of Style (16^th Edition):

Villalobos, Luis Alonso. “Annual cool-season forage systems for fall grazing by cattle.” 2015. Doctoral Dissertation, Colorado State University. Accessed April 19, 2021. http://hdl.handle.net/10217/170422.

MLA Handbook (7^th Edition):

Villalobos, Luis Alonso. “Annual cool-season forage systems for fall grazing by cattle.” 2015. Web. 19 Apr 2021.

Vancouver:

Villalobos LA. Annual cool-season forage systems for fall grazing by cattle. [Internet] [Doctoral dissertation]. Colorado State University; 2015. [cited 2021 Apr 19]. Available from: http://hdl.handle.net/10217/170422.

Council of Science Editors:

Villalobos LA. Annual cool-season forage systems for fall grazing by cattle. [Doctoral Dissertation]. Colorado State University; 2015. Available from: http://hdl.handle.net/10217/170422

2. Ahola, Jason K. Copper, zinc, and manganese in beef cattle production: effects of supplementation and source on reproduction, mineral status, feedlot performance, immunity, and carcass characteristics.

Degree: PhD, Animal Sciences, 2004, Colorado State University

URL: http://hdl.handle.net/10217/170734

► Over a two-year period, crossbred mature beef cows ( n = 178, Year 1; n = 148, Year 2) and young females (n = 43… (more)

▼ Over a two-year period, crossbred mature beef cows ( n = 178, Year 1; n = 148, Year 2) and young females (n = 43 nulliparous heifers, Year 1; n = 37 primiparous cows, Year 2) grazing in eastern Colorado were used to evaluate the effects of Cu, Zn, and Mn supplementation and source on reproduction, mineral status, immunity, and cow and calf performance. Cow treatments included: 1) control (no supplemental Cu, Zn, or Mn); 2) organic (50% organic and 50% inorganic Cu, Zn, and Mn); and 3) inorganic (100% inorganic CuSO4, ZnSO4, and MnSO4) trace minerals. Heifer treatments included: 1) organic, or 2) inorganic trace minerals. Free-choice mineral feeders were used to provide current NRC-recommended concentrations of Cu, Zn, and Mn from 54 and 82 d (Year 1, heifers and cows, respectively) and 81 d (Year 2) prior to the average calving date of the herd through 110 and 119 d (Year 1, cows and heifers, respectively) and 135 d (Year 2) post-calving. Terminal steer and heifer calves from each year's calf crop were maintained on their appropriate pasture trace mineral treatments and had exclusive access to mineral treatments via creep feeders from approximately 95 d of age until weaning. After weaning, calves were grown and finished in a feedlot on the same pre-weaning trace mineral treatments. Performance, immune response, mortality, morbidity, mineral status, carcass traits, and longissimus dorsi fatty acid profiles were evaluated. In the grazing portion of the experiment, results indicate that trace mineral supplementation in cows and source in cows and heifers affected trace mineral status. Reproductive results were variable in heifers; however, in cows trace mineral supplementation improved pregnancy rate to AI compared to cows not supplemented with Cu, Zn, or Mn for more than 1 yr. Calf performance was greater in non-supplemented control calves vs. supplemented calves in both years, while source also affected calf performance but not consistently in both years. Trace mineral source did not affect calf performance in young grazing females. During the feedlot phase in Year 1, gain to feed ratio was greater in Inorganic vs. Organic calves in both the growing and finishing phases and greater in non-supplemented control calves vs. supplemented calves only during the finishing phase; however, gain to feed ratios were not affected by either supplementation or source in Year 2. Liver Cu and Mn concentrations were affected by supplementation, however immune response, morbidity, carcass traits, and longissimus dorsi fatty acid profiles were not different across treatments. Based on the reduced reproductive performance in non-supplemented cows, as well as literature indicating that Cu affects luteinizing hormone (LH) release, the effect of Cu status, supplementation and source on pituitary responsiveness to gonadotropin releasing hormone (GnRH) were evaluated using 12 multiparous, non-pregnant, non-suckling, ovariectomized Angus cows. After receiving 5 mg Mo/kg diet and 0.3% S during a 216-d Cu depletion phase, nine cows were… Advisors/Committee Members: Engle, Terry E. (advisor), Burns, Patrick D. (advisor), Seidel, George E. (committee member), Whittier, Jack C. (committee member), Field, Thomas G. (committee member).

Subjects/Keywords: Trace elements in animal nutrition; Beef cattle – Feeding and feeds; Beef – Quality

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

APA (6^th Edition):

Ahola, J. K. (2004). Copper, zinc, and manganese in beef cattle production: effects of supplementation and source on reproduction, mineral status, feedlot performance, immunity, and carcass characteristics. (Doctoral Dissertation). Colorado State University. Retrieved from http://hdl.handle.net/10217/170734

Chicago Manual of Style (16^th Edition):

Ahola, Jason K. “Copper, zinc, and manganese in beef cattle production: effects of supplementation and source on reproduction, mineral status, feedlot performance, immunity, and carcass characteristics.” 2004. Doctoral Dissertation, Colorado State University. Accessed April 19, 2021. http://hdl.handle.net/10217/170734.

MLA Handbook (7^th Edition):

Ahola, Jason K. “Copper, zinc, and manganese in beef cattle production: effects of supplementation and source on reproduction, mineral status, feedlot performance, immunity, and carcass characteristics.” 2004. Web. 19 Apr 2021.

Vancouver:

Ahola JK. Copper, zinc, and manganese in beef cattle production: effects of supplementation and source on reproduction, mineral status, feedlot performance, immunity, and carcass characteristics. [Internet] [Doctoral dissertation]. Colorado State University; 2004. [cited 2021 Apr 19]. Available from: http://hdl.handle.net/10217/170734.

Council of Science Editors:

Ahola JK. Copper, zinc, and manganese in beef cattle production: effects of supplementation and source on reproduction, mineral status, feedlot performance, immunity, and carcass characteristics. [Doctoral Dissertation]. Colorado State University; 2004. Available from: http://hdl.handle.net/10217/170734

Colorado State University

3. Tibbetts, Gary K. Selected factors that influence profitability of feedlot cattle.

Degree: PhD, Animal Sciences, 2010, Colorado State University

URL: http://hdl.handle.net/10217/39053

► For the primary emphasis of this dissertation, twenty-three ranches were selected from ranch cooperators in a large scale Nebraska-based cattle system to establish baseline measurements… (more)

▼ For the primary emphasis of this dissertation, twenty-three ranches were selected from ranch cooperators in a large scale Nebraska-based cattle system to establish baseline measurements for liver concentrations of trace minerals, disease titers, parasite load, percent morbidity and gain performance. Upon arrival at the feedlot blood, liver, and fecal samples were collected from approximately 10% of each ranch group. After all yr 1 cattle were harvested an 11 ranch subset of the original 23 ranches was selected based on ranch weaning practice for a second yr survey. In yr 2 all ranches shipped calves to the feedlot on the day of weaning and all fed a standardized free choice mineral containing organic trace mineral complexes (OTM) to cow calf pairs 45 d prior to weaning. Comparing yr 1 and 2 for the 1 ranches, percent 1st pulls decreased from yr 1 to yr 2. Carcass quality was decreased from yr 1 to yr 2. Liver Cu concentrations of calves at weaning increased from yr 1 to a yr 2 and Zn and Mn liver concentrations were similar across years. Across both years, higher liver Cu concentration was correlated with decreasing total pulls and increasing ADG and mortality tended to decrease as Cu concentration increased. Higher liver Mn concentrations tended to be correlated with lower total pulls. There was no correlation between liver Zn concentration and animal and health performance. In conclusion, allowing cow-calf pairs access to free-choice mineral containing OTM prior to weaning improved some aspects of feedlot health and performance. For a second paper feedlot performance records from the U.S. Meat Animal Research Center feedlot for 1993 through 2000, were analyzed to evaluate the impact of footrot on ADG and total days on feed. Records from the original pool of 36,755 bull, steer and heifer calves were sorted so that only steers that had a single footrot incidence and those with no other morbidities were included in the data set (7,100 steers). To roughly pattern these data to industry production practices, time of footrot insult during feeding was divided into three production periods; starting (0-60 d), growing (61-120 d) and finishing (121d - harvest). Records were evaluated to determine which limb was more likely to be affected with footrot. A total of 459 (6.5%) steers were treated for a single footrot incident. ADG for cattle experiencing a single footrot incident was decreased compared to non effected cattle. The production period of footrot onset impacted both ADG and total days on feed. Mean days on feed for the non-affected cattle was 262 d while mean days on feed for footrot affected cattle was 267 d (P<0.01). The impact of footrot on days on feed for the starting, growing and finishing periods was -9.9 d, +2.2 d and +14.3 d. Advisors/Committee Members: Whittier, Jack C. (advisor), Engle, Terry E. (advisor), Field, Thomas G. (committee member), Mortimer, Robert George (committee member).

Subjects/Keywords: weaning; beef cattle; trace mineral; footrot; feedlot health; trace mineral complex; Trace elements in animal nutrition; Beef cattle – Nutrition; Feedlots – Health aspects; Beef cattle – Health; Calves – Nutrition

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

APA (6^th Edition):

Tibbetts, G. K. (2010). Selected factors that influence profitability of feedlot cattle. (Doctoral Dissertation). Colorado State University. Retrieved from http://hdl.handle.net/10217/39053

Chicago Manual of Style (16^th Edition):

Tibbetts, Gary K. “Selected factors that influence profitability of feedlot cattle.” 2010. Doctoral Dissertation, Colorado State University. Accessed April 19, 2021. http://hdl.handle.net/10217/39053.

MLA Handbook (7^th Edition):

Tibbetts, Gary K. “Selected factors that influence profitability of feedlot cattle.” 2010. Web. 19 Apr 2021.

Vancouver:

Tibbetts GK. Selected factors that influence profitability of feedlot cattle. [Internet] [Doctoral dissertation]. Colorado State University; 2010. [cited 2021 Apr 19]. Available from: http://hdl.handle.net/10217/39053.

Council of Science Editors:

Tibbetts GK. Selected factors that influence profitability of feedlot cattle. [Doctoral Dissertation]. Colorado State University; 2010. Available from: http://hdl.handle.net/10217/39053

Colorado State University

4. Perry, Miranda V. Evaluating the adoption level of quality-oriented management practices by cattle producers and motivation for participation in beef quality assurance (BQA) programs.

Degree: MS(M.S.), Animal Sciences, 2013, Colorado State University

URL: http://hdl.handle.net/10217/79132

To view the abstract, please see the full text of the document. Advisors/Committee Members: Ahola, Jason K. (advisor), Peel, R. Kraig (committee member), Whittier, Jack C. (committee member), Hadrich, Joleen C. (committee member), VanOverbeke, Deborah L. (committee member).

Subjects/Keywords: cattle producer; survey; non-ambulatory; national beef quality audit

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

APA (6^th Edition):

Perry, M. V. (2013). Evaluating the adoption level of quality-oriented management practices by cattle producers and motivation for participation in beef quality assurance (BQA) programs. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/79132

Chicago Manual of Style (16^th Edition):

Perry, Miranda V. “Evaluating the adoption level of quality-oriented management practices by cattle producers and motivation for participation in beef quality assurance (BQA) programs.” 2013. Masters Thesis, Colorado State University. Accessed April 19, 2021. http://hdl.handle.net/10217/79132.

MLA Handbook (7^th Edition):

Perry, Miranda V. “Evaluating the adoption level of quality-oriented management practices by cattle producers and motivation for participation in beef quality assurance (BQA) programs.” 2013. Web. 19 Apr 2021.

Vancouver:

Perry MV. Evaluating the adoption level of quality-oriented management practices by cattle producers and motivation for participation in beef quality assurance (BQA) programs. [Internet] [Masters thesis]. Colorado State University; 2013. [cited 2021 Apr 19]. Available from: http://hdl.handle.net/10217/79132.

Council of Science Editors:

Perry MV. Evaluating the adoption level of quality-oriented management practices by cattle producers and motivation for participation in beef quality assurance (BQA) programs. [Masters Thesis]. Colorado State University; 2013. Available from: http://hdl.handle.net/10217/79132

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