Model components of forage-fed cattle systems: energy expenditure of grazing cattle and prediction of intake in dairy cows
Tesis para obtener el grado de Doctor of Philosophy, de la University of Florida (Estados Unidos), en 1998
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| Formato: | info:ar-repo/semantics/tesis doctoral |
| Lenguaje: | Inglés |
| Publicado: |
University of Florida
2019
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| Acceso en línea: | http://hdl.handle.net/20.500.12123/6453 https://ufdc.ufl.edu/AA00038483/00001/ |
| _version_ | 1855035677848109056 |
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| author | Rochinotti, Diego |
| author2 | Moore, John E. (director) |
| author_browse | Moore, John E. (director) Rochinotti, Diego |
| author_facet | Moore, John E. (director) Rochinotti, Diego |
| author_sort | Rochinotti, Diego |
| collection | INTA Digital |
| description | Tesis para obtener el grado de Doctor of Philosophy, de la University of Florida (Estados Unidos), en 1998 |
| format | info:ar-repo/semantics/tesis doctoral |
| id | INTA6453 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2019 |
| publishDateRange | 2019 |
| publishDateSort | 2019 |
| publisher | University of Florida |
| publisherStr | University of Florida |
| record_format | dspace |
| spelling | INTA64532021-08-23T17:34:29Z Model components of forage-fed cattle systems: energy expenditure of grazing cattle and prediction of intake in dairy cows Rochinotti, Diego Moore, John E. (director) Ganado Bovino Alimentación de los Animales Pastoreo Forrajes Vacas Lecheras Pastizales Cattle Animal Feeding Grazing Forage Dairy Cows Pastures Tesis para obtener el grado de Doctor of Philosophy, de la University of Florida (Estados Unidos), en 1998 The maintenance energy requirements of cattle should include the activity component when cattle are grazing. The prediction of the voluntary dry matter intake (DMI) is also a factor of importance for feed management of cattle. The objectives were to develop a procedure to account for energy maintenance requirement of grazing cattle, and to develop predictive equations for voluntary DMI by dairy cattle fed high-forage diets. A literature review of factors affecting maintenance energy requirements was conducted. It is concluded that the principal factors affecting the additional requirements for maintenance of grazing cattle are the activities of walking and eating. Paddock size is an important factor affecting walking distance and a quadratic equation to calculate walking distance from paddock size is proposed. Adjustments for activity of grazing cattle, walking, ascent, and eating ranged from 15% for cattle grazing small paddocks of high quality forage, and high forage availability, to 70% for cattle grazing large paddocks of low quality forage, with limited forage availability. Data from published experiments with dairy cows fed high- forage diets were used to generate and evaluate equations for the prediction of voluntary DMI . Equations were developed by multiple regression and variable selection procedures. Three equations were evaluated together with three published equations. The equations including only the linear terms of the selected variables resulted in a better sensitivity of the model. The models generated had a mean square prediction error from 4.24 to 4.56 kg2 , lower than that obtained with the published equations. The model selected for voluntary DMI prediction includes body weight, days in milk, production of 4% fat corrected milk, forage dry matter, and diet neutral detergent fiber as independent variables. EEA Mercedes Fil: Rochinotti, Diego. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Mercedes; Argentina 2019-12-05T11:23:14Z 2019-12-05T11:23:14Z 1998 info:ar-repo/semantics/tesis doctoral info:eu-repo/semantics/doctoralThesis info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/6453 https://ufdc.ufl.edu/AA00038483/00001/ eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf University of Florida |
| spellingShingle | Ganado Bovino Alimentación de los Animales Pastoreo Forrajes Vacas Lecheras Pastizales Cattle Animal Feeding Grazing Forage Dairy Cows Pastures Rochinotti, Diego Model components of forage-fed cattle systems: energy expenditure of grazing cattle and prediction of intake in dairy cows |
| title | Model components of forage-fed cattle systems: energy expenditure of grazing cattle and prediction of intake in dairy cows |
| title_full | Model components of forage-fed cattle systems: energy expenditure of grazing cattle and prediction of intake in dairy cows |
| title_fullStr | Model components of forage-fed cattle systems: energy expenditure of grazing cattle and prediction of intake in dairy cows |
| title_full_unstemmed | Model components of forage-fed cattle systems: energy expenditure of grazing cattle and prediction of intake in dairy cows |
| title_short | Model components of forage-fed cattle systems: energy expenditure of grazing cattle and prediction of intake in dairy cows |
| title_sort | model components of forage fed cattle systems energy expenditure of grazing cattle and prediction of intake in dairy cows |
| topic | Ganado Bovino Alimentación de los Animales Pastoreo Forrajes Vacas Lecheras Pastizales Cattle Animal Feeding Grazing Forage Dairy Cows Pastures |
| url | http://hdl.handle.net/20.500.12123/6453 https://ufdc.ufl.edu/AA00038483/00001/ |
| work_keys_str_mv | AT rochinottidiego modelcomponentsofforagefedcattlesystemsenergyexpenditureofgrazingcattleandpredictionofintakeindairycows |