Body composition and energy and protein requirements of grazing Nelore steers

Body composition and energy and protein requirements of grazing Nelore steers

This experimentwas carried out with the objective of determining the energy and protein requirements of grazing Nellore steers. Twenty four Nellore steers (average 371 ± 14 kg of BW and 26 months old) were used. Four steers were slaughtered at the beginning of the experiment (reference group), serving as a reference for the subsequent study. The remaining 20 animals were weighed and distributed in a randomized complete block design with four levels of supplementation offers: 0.0 (mineral mixture - control), 0.3, 0.6 and 0.9% BW, with five replications. The supplements, based on ground corn, soybean meal and/or urea, were previously balanced to achieve an average daily gain of 350, 650 and 850g, respectively, for the different levels of supplementation offers. The protein, fat and energy contents retained in the animal body were determined by regression equations of the logarithm of the protein, fat and energy in the animal body contents, in function of the logarithm of empty body weight (EBW). Net requirements of protein and energy for a gain of 1kg of EBW were obtained by deriving the prediction equations of the animal body content of protein, fat, or energy in function of the EBW logarithm. The net energy requirements for weight gain of Nellore steer can be obtained by the equation: NEg = 0.05764 × EBW0,75 × DEBWG0.8328. The following equation was obtained to estimate the retained protein (RP), in function of the average daily gain (ADG) and retained energy (RE): RP = 28.9199 + 85.7301 FBWG + 8.0669 RE. The net protein requirement for Nellore steers decreased as the body weight increased, with values of 174.62 and 163.10 g/kg EBG for animals of 300 and 450 kg BW, respectively.

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Main Authors: Almeida,Vitor Visintin Silva de, Queiroz,Augusto César de, Silva,Fabiano Ferreira da, Silva,Robério Rodrigues, Oliveira,Aline Cardoso, Souza,Danilo Ribeiro de
Format: Digital revista
Language:English
Published: Sociedade Brasileira de Zootecnia 2009
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000700026
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spelling oai:scielo:S1516-359820090007000262009-09-15Body composition and energy and protein requirements of grazing Nelore steersAlmeida,Vitor Visintin Silva deQueiroz,Augusto César deSilva,Fabiano Ferreira daSilva,Robério RodriguesOliveira,Aline CardosoSouza,Danilo Ribeiro de energy protein requirements zebu cattle This experimentwas carried out with the objective of determining the energy and protein requirements of grazing Nellore steers. Twenty four Nellore steers (average 371 ± 14 kg of BW and 26 months old) were used. Four steers were slaughtered at the beginning of the experiment (reference group), serving as a reference for the subsequent study. The remaining 20 animals were weighed and distributed in a randomized complete block design with four levels of supplementation offers: 0.0 (mineral mixture - control), 0.3, 0.6 and 0.9% BW, with five replications. The supplements, based on ground corn, soybean meal and/or urea, were previously balanced to achieve an average daily gain of 350, 650 and 850g, respectively, for the different levels of supplementation offers. The protein, fat and energy contents retained in the animal body were determined by regression equations of the logarithm of the protein, fat and energy in the animal body contents, in function of the logarithm of empty body weight (EBW). Net requirements of protein and energy for a gain of 1kg of EBW were obtained by deriving the prediction equations of the animal body content of protein, fat, or energy in function of the EBW logarithm. The net energy requirements for weight gain of Nellore steer can be obtained by the equation: NEg = 0.05764 × EBW0,75 × DEBWG0.8328. The following equation was obtained to estimate the retained protein (RP), in function of the average daily gain (ADG) and retained energy (RE): RP = 28.9199 + 85.7301 FBWG + 8.0669 RE. The net protein requirement for Nellore steers decreased as the body weight increased, with values of 174.62 and 163.10 g/kg EBG for animals of 300 and 450 kg BW, respectively.info:eu-repo/semantics/openAccessSociedade Brasileira de ZootecniaRevista Brasileira de Zootecnia v.38 n.7 20092009-07-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000700026en10.1590/S1516-35982009000700026
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country Brasil
countrycode BR
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libraryname SciELO
language English
format Digital
author Almeida,Vitor Visintin Silva de
Queiroz,Augusto César de
Silva,Fabiano Ferreira da
Silva,Robério Rodrigues
Oliveira,Aline Cardoso
Souza,Danilo Ribeiro de
spellingShingle Almeida,Vitor Visintin Silva de
Queiroz,Augusto César de
Silva,Fabiano Ferreira da
Silva,Robério Rodrigues
Oliveira,Aline Cardoso
Souza,Danilo Ribeiro de
Body composition and energy and protein requirements of grazing Nelore steers
author_facet Almeida,Vitor Visintin Silva de
Queiroz,Augusto César de
Silva,Fabiano Ferreira da
Silva,Robério Rodrigues
Oliveira,Aline Cardoso
Souza,Danilo Ribeiro de
author_sort Almeida,Vitor Visintin Silva de
title Body composition and energy and protein requirements of grazing Nelore steers
title_short Body composition and energy and protein requirements of grazing Nelore steers
title_full Body composition and energy and protein requirements of grazing Nelore steers
title_fullStr Body composition and energy and protein requirements of grazing Nelore steers
title_full_unstemmed Body composition and energy and protein requirements of grazing Nelore steers
title_sort body composition and energy and protein requirements of grazing nelore steers
description This experimentwas carried out with the objective of determining the energy and protein requirements of grazing Nellore steers. Twenty four Nellore steers (average 371 ± 14 kg of BW and 26 months old) were used. Four steers were slaughtered at the beginning of the experiment (reference group), serving as a reference for the subsequent study. The remaining 20 animals were weighed and distributed in a randomized complete block design with four levels of supplementation offers: 0.0 (mineral mixture - control), 0.3, 0.6 and 0.9% BW, with five replications. The supplements, based on ground corn, soybean meal and/or urea, were previously balanced to achieve an average daily gain of 350, 650 and 850g, respectively, for the different levels of supplementation offers. The protein, fat and energy contents retained in the animal body were determined by regression equations of the logarithm of the protein, fat and energy in the animal body contents, in function of the logarithm of empty body weight (EBW). Net requirements of protein and energy for a gain of 1kg of EBW were obtained by deriving the prediction equations of the animal body content of protein, fat, or energy in function of the EBW logarithm. The net energy requirements for weight gain of Nellore steer can be obtained by the equation: NEg = 0.05764 × EBW0,75 × DEBWG0.8328. The following equation was obtained to estimate the retained protein (RP), in function of the average daily gain (ADG) and retained energy (RE): RP = 28.9199 + 85.7301 FBWG + 8.0669 RE. The net protein requirement for Nellore steers decreased as the body weight increased, with values of 174.62 and 163.10 g/kg EBG for animals of 300 and 450 kg BW, respectively.
publisher Sociedade Brasileira de Zootecnia
publishDate 2009
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000700026
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