Nutritional requirements of energy, protein and macrominerals for maintenance and weight gain of young crossbred Nellore × Holstein bulls on pasture
The objective of this study was to estimate requirements of energy, protein and macrominerals of young Nellore/Holstein crossbreds bulls supplemented on pastures of Brachiaria decumbens Stapf. Thirty-five young bulls, at 8.53±0.18 months of age and with initial body weight of 230.6±6.1 kg were used....
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Sociedade Brasileira de Zootecnia
2012-03-01
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doaj-474f44533d484140b39e7488283721832020-11-24T23:01:51ZengSociedade Brasileira de ZootecniaRevista Brasileira de Zootecnia1516-35981806-92902012-03-0141373474510.1590/S1516-35982012000300037Nutritional requirements of energy, protein and macrominerals for maintenance and weight gain of young crossbred Nellore × Holstein bulls on pastureMarlos Oliveira PortoMário Fonseca PaulinoSebastião de Campos Valadares FilhoEdenio DetmannJucilene CavaliMaykel Franklin Lima SalesÉriton Egidio Lisboa ValenteVictor Rezende Moreira CoutoThe objective of this study was to estimate requirements of energy, protein and macrominerals of young Nellore/Holstein crossbreds bulls supplemented on pastures of Brachiaria decumbens Stapf. Thirty-five young bulls, at 8.53±0.18 months of age and with initial body weight of 230.6±6.1 kg were used. Ten animals were slaughtered as reference, in different weight range, and the other animals were slaughtered at the end of the experimental period. For estimate of net energy requirements for weight, a regression equation between log of retained energy (RE) and log of empty body weight gain (EBWG) was constructed. Net requirements of Ca, P, Mg, Na and K were determined by the equation Y' = a.b.Xb-1, in which a and b represent the intercept and the coefficient of equation of prediction of macrominerals in body content, respectively. Requirements of metabolizable energy for maintenance (MEm) were obtained from retained energy in function of metabolizable energy intake (MEI). The requirements of MEm of Nellore/Holstein crossbreds young bulls on pasture was 125 kcal/EBW0.75/day. The efficiency of ME utilization for maintenance (k) of grazing Nellore/Holstein crossbred young mbulls was 0.58 and 0.24 for gain. The total metabolizable protein requirements for an animal with 400 kg and with average daily gain of 1.0 kg, were 638.36 g/day. The dietetic requirements of Ca and P for an animal with 400 kg BW were 0.49 and 0.21% of DM, respectively. Daily metabolizable energy requirement for maintenance of grazing Nellore/Holstein crossbred young bulls was 11.6% greater than the values found for cattle in feedlot in Brazil (112 kcal/kg EBW0.75).http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000300037multiple supplementsnet energysupplementationZebu |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Marlos Oliveira Porto Mário Fonseca Paulino Sebastião de Campos Valadares Filho Edenio Detmann Jucilene Cavali Maykel Franklin Lima Sales Ériton Egidio Lisboa Valente Victor Rezende Moreira Couto |
spellingShingle |
Marlos Oliveira Porto Mário Fonseca Paulino Sebastião de Campos Valadares Filho Edenio Detmann Jucilene Cavali Maykel Franklin Lima Sales Ériton Egidio Lisboa Valente Victor Rezende Moreira Couto Nutritional requirements of energy, protein and macrominerals for maintenance and weight gain of young crossbred Nellore × Holstein bulls on pasture Revista Brasileira de Zootecnia multiple supplements net energy supplementation Zebu |
author_facet |
Marlos Oliveira Porto Mário Fonseca Paulino Sebastião de Campos Valadares Filho Edenio Detmann Jucilene Cavali Maykel Franklin Lima Sales Ériton Egidio Lisboa Valente Victor Rezende Moreira Couto |
author_sort |
Marlos Oliveira Porto |
title |
Nutritional requirements of energy, protein and macrominerals for maintenance and weight gain of young crossbred Nellore × Holstein bulls on pasture |
title_short |
Nutritional requirements of energy, protein and macrominerals for maintenance and weight gain of young crossbred Nellore × Holstein bulls on pasture |
title_full |
Nutritional requirements of energy, protein and macrominerals for maintenance and weight gain of young crossbred Nellore × Holstein bulls on pasture |
title_fullStr |
Nutritional requirements of energy, protein and macrominerals for maintenance and weight gain of young crossbred Nellore × Holstein bulls on pasture |
title_full_unstemmed |
Nutritional requirements of energy, protein and macrominerals for maintenance and weight gain of young crossbred Nellore × Holstein bulls on pasture |
title_sort |
nutritional requirements of energy, protein and macrominerals for maintenance and weight gain of young crossbred nellore × holstein bulls on pasture |
publisher |
Sociedade Brasileira de Zootecnia |
series |
Revista Brasileira de Zootecnia |
issn |
1516-3598 1806-9290 |
publishDate |
2012-03-01 |
description |
The objective of this study was to estimate requirements of energy, protein and macrominerals of young Nellore/Holstein crossbreds bulls supplemented on pastures of Brachiaria decumbens Stapf. Thirty-five young bulls, at 8.53±0.18 months of age and with initial body weight of 230.6±6.1 kg were used. Ten animals were slaughtered as reference, in different weight range, and the other animals were slaughtered at the end of the experimental period. For estimate of net energy requirements for weight, a regression equation between log of retained energy (RE) and log of empty body weight gain (EBWG) was constructed. Net requirements of Ca, P, Mg, Na and K were determined by the equation Y' = a.b.Xb-1, in which a and b represent the intercept and the coefficient of equation of prediction of macrominerals in body content, respectively. Requirements of metabolizable energy for maintenance (MEm) were obtained from retained energy in function of metabolizable energy intake (MEI). The requirements of MEm of Nellore/Holstein crossbreds young bulls on pasture was 125 kcal/EBW0.75/day. The efficiency of ME utilization for maintenance (k) of grazing Nellore/Holstein crossbred young mbulls was 0.58 and 0.24 for gain. The total metabolizable protein requirements for an animal with 400 kg and with average daily gain of 1.0 kg, were 638.36 g/day. The dietetic requirements of Ca and P for an animal with 400 kg BW were 0.49 and 0.21% of DM, respectively. Daily metabolizable energy requirement for maintenance of grazing Nellore/Holstein crossbred young bulls was 11.6% greater than the values found for cattle in feedlot in Brazil (112 kcal/kg EBW0.75). |
topic |
multiple supplements net energy supplementation Zebu |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000300037 |
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