Modelling Supplementation Strategies for Beef Steer Rearing and Fattening Systems in Southern Chile

A mathematical model was developed to analyze beef production systems in Southern Chile. The study considered the identification of the main components of systems under different beef steer management strategies, using pasture with or without supplementation and back grounding cattle on pasture foll...

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Autores principales:	Toro,Paula, Catrileo,Adrián, Aguilar,Claudio, Vera,Raúl
Lenguaje:	English
Publicado:	Instituto de Investigaciones Agropecuarias, INIA 2009
Materias:	beef cattle supplementation grazing systems simulation models
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000200010
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spelling	oai:scielo:S0718-583920090002000102018-10-01Modelling Supplementation Strategies for Beef Steer Rearing and Fattening Systems in Southern ChileToro,PaulaCatrileo,AdriánAguilar,ClaudioVera,Raúl beef cattle supplementation grazing systems simulation models A mathematical model was developed to analyze beef production systems in Southern Chile. The study considered the identification of the main components of systems under different beef steer management strategies, using pasture with or without supplementation and back grounding cattle on pasture followed by a winter period of confined feeding with pasture silage and concentrates. Validation of model outputs using 200 kg LW Hereford steers against real experimental data showed no significant differences (P ≥ 0.01) between simulated and observed final weights. In order to analyze the interaction between the stocking rate (SR) and supplementation, three SR of 2, 2.5 and 3 steers ha-1 with and without pasture silage supplementation at the rate of 5 kg DMd-1 steer-1 for the length of the entire period were simulated. Means were compared by the least significant difference (LSD, P ≤ 0.05). Significant differences were found in terms of final weights, which decreased with increasing SR regardless of the supplementation level, although silage supplementation tended to reduce differences between SR. A second set of simulation runs was carried out to simulate on-farm finishing of the steers through a final phase of confined feeding based on a ration of silage and concentrates. Final weights differed between SR and systems and results showed that the optimum corresponded to 2.5 steers ha-1, since at this SR the largest income corresponded to the smallest mean cost. It is concluded that a stocking rate of 2.5 steers ha-1 is feasible if winter supplementation is available, independently of a finishing period in feedlot.info:eu-repo/semantics/openAccessInstituto de Investigaciones Agropecuarias, INIAChilean journal of agricultural research v.69 n.2 20092009-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000200010en10.4067/S0718-58392009000200010
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	beef cattle supplementation grazing systems simulation models
spellingShingle	beef cattle supplementation grazing systems simulation models Toro,Paula Catrileo,Adrián Aguilar,Claudio Vera,Raúl Modelling Supplementation Strategies for Beef Steer Rearing and Fattening Systems in Southern Chile
description	A mathematical model was developed to analyze beef production systems in Southern Chile. The study considered the identification of the main components of systems under different beef steer management strategies, using pasture with or without supplementation and back grounding cattle on pasture followed by a winter period of confined feeding with pasture silage and concentrates. Validation of model outputs using 200 kg LW Hereford steers against real experimental data showed no significant differences (P ≥ 0.01) between simulated and observed final weights. In order to analyze the interaction between the stocking rate (SR) and supplementation, three SR of 2, 2.5 and 3 steers ha-1 with and without pasture silage supplementation at the rate of 5 kg DMd-1 steer-1 for the length of the entire period were simulated. Means were compared by the least significant difference (LSD, P ≤ 0.05). Significant differences were found in terms of final weights, which decreased with increasing SR regardless of the supplementation level, although silage supplementation tended to reduce differences between SR. A second set of simulation runs was carried out to simulate on-farm finishing of the steers through a final phase of confined feeding based on a ration of silage and concentrates. Final weights differed between SR and systems and results showed that the optimum corresponded to 2.5 steers ha-1, since at this SR the largest income corresponded to the smallest mean cost. It is concluded that a stocking rate of 2.5 steers ha-1 is feasible if winter supplementation is available, independently of a finishing period in feedlot.
author	Toro,Paula Catrileo,Adrián Aguilar,Claudio Vera,Raúl
author_facet	Toro,Paula Catrileo,Adrián Aguilar,Claudio Vera,Raúl
author_sort	Toro,Paula
title	Modelling Supplementation Strategies for Beef Steer Rearing and Fattening Systems in Southern Chile
title_short	Modelling Supplementation Strategies for Beef Steer Rearing and Fattening Systems in Southern Chile
title_full	Modelling Supplementation Strategies for Beef Steer Rearing and Fattening Systems in Southern Chile
title_fullStr	Modelling Supplementation Strategies for Beef Steer Rearing and Fattening Systems in Southern Chile
title_full_unstemmed	Modelling Supplementation Strategies for Beef Steer Rearing and Fattening Systems in Southern Chile
title_sort	modelling supplementation strategies for beef steer rearing and fattening systems in southern chile
publisher	Instituto de Investigaciones Agropecuarias, INIA
publishDate	2009
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000200010
work_keys_str_mv	AT toropaula modellingsupplementationstrategiesforbeefsteerrearingandfatteningsystemsinsouthernchile AT catrileoadrian modellingsupplementationstrategiesforbeefsteerrearingandfatteningsystemsinsouthernchile AT aguilarclaudio modellingsupplementationstrategiesforbeefsteerrearingandfatteningsystemsinsouthernchile AT veraraul modellingsupplementationstrategiesforbeefsteerrearingandfatteningsystemsinsouthernchile
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Modelling Supplementation Strategies for Beef Steer Rearing and Fattening Systems in Southern Chile

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