Performance of lactating crossbred cows on pasture supplemented with conventional urea or slow release urea

The effect of using conventional urea (CU) or slow release urea (SRU) was evaluated by replacing soybean meal (SBM) in concentrated supplements in levels of 2, 4 or 6% (dry matter basis) on productive performance of crossbred Holstein x Zebu lactating dairy cows (499±61kg body weight and 167 days of...

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Main Authors: D.C. Abreu, R.P. Lana, A.S. Oliveira, F.A. Barbosa, F.L. Andrade, P.T. Silva, M.A. Fonseca, C.P. Ghedini, R.M. Paula, F.A. Magalhães
Format: Article
Language:English
Published: Universidade Federal de Minas Gerais 2014-10-01
Series:Arquivo Brasileiro de Medicina Veterinária e Zootecnia
Subjects:
Online Access:http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352014000501487&lng=en&tlng=en
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spelling doaj-a40a4bbad08447d085aef596a4dbb29e2020-11-24T22:15:28ZengUniversidade Federal de Minas GeraisArquivo Brasileiro de Medicina Veterinária e Zootecnia1678-41622014-10-016651487149410.1590/1678-6701S0102-09352014000501487Performance of lactating crossbred cows on pasture supplemented with conventional urea or slow release ureaD.C. AbreuR.P. LanaA.S. OliveiraF.A. BarbosaF.L. AndradeP.T. SilvaM.A. FonsecaC.P. GhediniR.M. PaulaF.A. MagalhãesThe effect of using conventional urea (CU) or slow release urea (SRU) was evaluated by replacing soybean meal (SBM) in concentrated supplements in levels of 2, 4 or 6% (dry matter basis) on productive performance of crossbred Holstein x Zebu lactating dairy cows (499±61kg body weight and 167 days of lactation) grazing on elephant grass (11.5% CP and 60% NDF) under rotational grazing during the rainy season. A supplement control (no urea) was used containing SBM as a protein source. A total of 21 cows were distributed an incomplete randomized block design with three periods of 21 days each (14 days of adaptation and seven days of collection). The animals entered the paddocks with a pasture height of 110-120cm and left when the grass reached the height of 40-50cm. The concentrated isonitrogenous supplements (24% crude protein, dry matter basis) were provided in the amount of 3.2kg/cow/day (fed basis). There was no effect (P>0.05) on source of crude protein (SBM vs source NPN), source NPN, level of NPN, interaction between source NPN and level of NPN on milk production (10.0kg/day), fat milk production corrected to 3.5% (10.7kg/day), levels of fat (4.01%), protein (3.66%), lactose (4.16%), total solids (12.86%) and non-fat solids (8.60%) in milk. The replacement of CU by SRU does not promote improvement in the productive performance of crossbred dairy cows grazing on elephant grass during the rainy season. Urea (CU or SRU) can be included in up to 6% of the DM concentrated supplements, replacing SBM, without affecting the productive performance of crossbred cows (Holstein x Zebu) in pasture during the rainy season.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352014000501487&lng=en&tlng=enleitenitrogênio não proteico
collection DOAJ
language English
format Article
sources DOAJ
author D.C. Abreu
R.P. Lana
A.S. Oliveira
F.A. Barbosa
F.L. Andrade
P.T. Silva
M.A. Fonseca
C.P. Ghedini
R.M. Paula
F.A. Magalhães
spellingShingle D.C. Abreu
R.P. Lana
A.S. Oliveira
F.A. Barbosa
F.L. Andrade
P.T. Silva
M.A. Fonseca
C.P. Ghedini
R.M. Paula
F.A. Magalhães
Performance of lactating crossbred cows on pasture supplemented with conventional urea or slow release urea
Arquivo Brasileiro de Medicina Veterinária e Zootecnia
leite
nitrogênio não proteico
author_facet D.C. Abreu
R.P. Lana
A.S. Oliveira
F.A. Barbosa
F.L. Andrade
P.T. Silva
M.A. Fonseca
C.P. Ghedini
R.M. Paula
F.A. Magalhães
author_sort D.C. Abreu
title Performance of lactating crossbred cows on pasture supplemented with conventional urea or slow release urea
title_short Performance of lactating crossbred cows on pasture supplemented with conventional urea or slow release urea
title_full Performance of lactating crossbred cows on pasture supplemented with conventional urea or slow release urea
title_fullStr Performance of lactating crossbred cows on pasture supplemented with conventional urea or slow release urea
title_full_unstemmed Performance of lactating crossbred cows on pasture supplemented with conventional urea or slow release urea
title_sort performance of lactating crossbred cows on pasture supplemented with conventional urea or slow release urea
publisher Universidade Federal de Minas Gerais
series Arquivo Brasileiro de Medicina Veterinária e Zootecnia
issn 1678-4162
publishDate 2014-10-01
description The effect of using conventional urea (CU) or slow release urea (SRU) was evaluated by replacing soybean meal (SBM) in concentrated supplements in levels of 2, 4 or 6% (dry matter basis) on productive performance of crossbred Holstein x Zebu lactating dairy cows (499±61kg body weight and 167 days of lactation) grazing on elephant grass (11.5% CP and 60% NDF) under rotational grazing during the rainy season. A supplement control (no urea) was used containing SBM as a protein source. A total of 21 cows were distributed an incomplete randomized block design with three periods of 21 days each (14 days of adaptation and seven days of collection). The animals entered the paddocks with a pasture height of 110-120cm and left when the grass reached the height of 40-50cm. The concentrated isonitrogenous supplements (24% crude protein, dry matter basis) were provided in the amount of 3.2kg/cow/day (fed basis). There was no effect (P>0.05) on source of crude protein (SBM vs source NPN), source NPN, level of NPN, interaction between source NPN and level of NPN on milk production (10.0kg/day), fat milk production corrected to 3.5% (10.7kg/day), levels of fat (4.01%), protein (3.66%), lactose (4.16%), total solids (12.86%) and non-fat solids (8.60%) in milk. The replacement of CU by SRU does not promote improvement in the productive performance of crossbred dairy cows grazing on elephant grass during the rainy season. Urea (CU or SRU) can be included in up to 6% of the DM concentrated supplements, replacing SBM, without affecting the productive performance of crossbred cows (Holstein x Zebu) in pasture during the rainy season.
topic leite
nitrogênio não proteico
url http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352014000501487&lng=en&tlng=en
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