Effects of dietary protein level on intake, digestibility, and energy expenditure in dairy heifers

Detalhes bibliográficos
Autor(a) principal: Araújo, Laylles Costa
Data de Publicação: 2020
Outros Autores: Valente, Eriton Egidio Lisboa, Filipini, Valdir da Trindade, Carvalho, Silvana Teixeira, Stahlhofer, Mariane, Cabral, Carla Heloisa Avelino, Damasceno, Matheus Leonardi, Barbizan, Mariana
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Semina. Ciências Agrárias (Online)
Texto Completo: https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/38126
Resumo: Balancing diets for protein affects both protein and energy use efficiency in cattle. This study aimed to evaluate the effects of dietary protein level on intake, digestibility and energy expenditure in Holstein heifers. Four Holstein heifers with a mean BW of 266.5 ± 10.7 kg were distributed in a 4 x 4 balanced Latin square design. Each period was comprised of 14 d for adaptation and 6 d for samplings. The heifers were fed diets with 9, 12, 15 and 18% of crude protein (CP). Total feces and urine were collected. Rumen fluid was collected at 2, 4, 6 and 8 h after feeding. The energy expenditure was evaluated at 6 a.m., 12 a.m., 6 p.m. and 12 p.m. by a closed-circuit mask technique. The intake of dry matter (DM), organic matter (OM) and neutral detergent fiber (NDF) were similar between treatments (P > 0.05). Although the NDF digestibility was not changed (P > 0.05), the digestibilities of DM, OM, CP, non-fibrous carbohydrates, and total digestible nutrients increased linearly (P < 0.05) with increasing CP levels in the diet. Urinary urea nitrogen excretion and nitrogen retained increased linearly (P < 0.01) with increasing CP levels. Dietary CP levels did not affect (P =0.53) energy expenditure in heifers. Ruminal ammonia-nitrogen concentration peaked at 2-4 h after feeding. Increasing dietary CP levels from 9 to 18% does not affect feed intake and energy expenditure in heifers. However, it improves the digestibility of OM and nitrogen retention.
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spelling Effects of dietary protein level on intake, digestibility, and energy expenditure in dairy heifersEfeitos do nível de proteína na ingestão, digestibilidade, e gasto energético em novilhas leiteirasCattleIntakeNitrogen excretionUrea.BovinosConsumoExcreção de nitrogênioUrea.Balancing diets for protein affects both protein and energy use efficiency in cattle. This study aimed to evaluate the effects of dietary protein level on intake, digestibility and energy expenditure in Holstein heifers. Four Holstein heifers with a mean BW of 266.5 ± 10.7 kg were distributed in a 4 x 4 balanced Latin square design. Each period was comprised of 14 d for adaptation and 6 d for samplings. The heifers were fed diets with 9, 12, 15 and 18% of crude protein (CP). Total feces and urine were collected. Rumen fluid was collected at 2, 4, 6 and 8 h after feeding. The energy expenditure was evaluated at 6 a.m., 12 a.m., 6 p.m. and 12 p.m. by a closed-circuit mask technique. The intake of dry matter (DM), organic matter (OM) and neutral detergent fiber (NDF) were similar between treatments (P > 0.05). Although the NDF digestibility was not changed (P > 0.05), the digestibilities of DM, OM, CP, non-fibrous carbohydrates, and total digestible nutrients increased linearly (P < 0.05) with increasing CP levels in the diet. Urinary urea nitrogen excretion and nitrogen retained increased linearly (P < 0.01) with increasing CP levels. Dietary CP levels did not affect (P =0.53) energy expenditure in heifers. Ruminal ammonia-nitrogen concentration peaked at 2-4 h after feeding. Increasing dietary CP levels from 9 to 18% does not affect feed intake and energy expenditure in heifers. However, it improves the digestibility of OM and nitrogen retention.O balanceamento das dietas proteicas afeta tanto a eficiência no uso de proteínas quanto a eficiência no uso de energia em bovinos. Este estudo teve como objetivo avaliar os efeitos dos níveis de proteína na dieta sobre consumo, digestibilidade e gasto de energia em novilhas Holandesas. Quatro novilhas Holandesas com um peso corporal (PC) médio de 266,5 ± 10,7 kg foram distribuídas em delineamento quadrado latino 4 x 4. Cada período era composto de 14 d para adaptação e 6 d para amostragens. As novilhas foram alimentadas com 9,12,15 e 18% de proteína bruta (PB). Fezes e urina totais foram coletadas. O líquido ruminal foi coletado às 2, 4, 6 e 8 h após a alimentação. O gasto de energia foi avaliado às 6h, 12h, 18h e 12h por uma técnica de máscara de circuito fechado. O consumo de matéria seca (MS), matéria orgânica (MO) e fibra em detergente neutro (FDN) foram similares entre os tratamentos (P > 0,05). Embora a digestibilidade do FDN não tenha sido alterada (P > 0,05), a digestibilidade de MS, MO, PB, carboidratos não-fibrosos e nutrientes digestíveis totais aumentou linearmente (P < 0,05) com o aumento dos níveis de PB na dieta. A excreção de uréia urinária e o nitrogênio retido aumentaram linearmente (P < 0,01). Os níveis de PB na dieta não afetaram (P = 0,53) o gasto de energia em novilhas. A concentração de nitrogênio amoniacal atingiu o pico em 2-4 h após a alimentação. O aumento dos níveis dietéticos de PB de 9 para 18% não afeta o consumo de ração e o gasto de energia em novilhas. Entretanto, melhora a digestibilidade da MO e a retenção de nitrogênio.UEL2020-11-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/3812610.5433/1679-0359.2020v41n6Supl2p3211Semina: Ciências Agrárias; Vol. 41 No. 6Supl2 (2020); 3211-3224Semina: Ciências Agrárias; v. 41 n. 6Supl2 (2020); 3211-32241679-03591676-546Xreponame:Semina. Ciências Agrárias (Online)instname:Universidade Estadual de Londrina (UEL)instacron:UELenghttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/38126/28278Copyright (c) 2020 Semina: Ciências Agráriashttp://creativecommons.org/licenses/by-nc/4.0info:eu-repo/semantics/openAccessAraújo, Laylles CostaValente, Eriton Egidio LisboaFilipini, Valdir da TrindadeCarvalho, Silvana TeixeiraStahlhofer, MarianeCabral, Carla Heloisa AvelinoDamasceno, Matheus LeonardiBarbizan, Mariana2022-10-04T16:49:50Zoai:ojs.pkp.sfu.ca:article/38126Revistahttp://www.uel.br/revistas/uel/index.php/semagrariasPUBhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/oaisemina.agrarias@uel.br1679-03591676-546Xopendoar:2022-10-04T16:49:50Semina. Ciências Agrárias (Online) - Universidade Estadual de Londrina (UEL)false
dc.title.none.fl_str_mv Effects of dietary protein level on intake, digestibility, and energy expenditure in dairy heifers
Efeitos do nível de proteína na ingestão, digestibilidade, e gasto energético em novilhas leiteiras
title Effects of dietary protein level on intake, digestibility, and energy expenditure in dairy heifers
spellingShingle Effects of dietary protein level on intake, digestibility, and energy expenditure in dairy heifers
Araújo, Laylles Costa
Cattle
Intake
Nitrogen excretion
Urea.
Bovinos
Consumo
Excreção de nitrogênio
Urea.
title_short Effects of dietary protein level on intake, digestibility, and energy expenditure in dairy heifers
title_full Effects of dietary protein level on intake, digestibility, and energy expenditure in dairy heifers
title_fullStr Effects of dietary protein level on intake, digestibility, and energy expenditure in dairy heifers
title_full_unstemmed Effects of dietary protein level on intake, digestibility, and energy expenditure in dairy heifers
title_sort Effects of dietary protein level on intake, digestibility, and energy expenditure in dairy heifers
author Araújo, Laylles Costa
author_facet Araújo, Laylles Costa
Valente, Eriton Egidio Lisboa
Filipini, Valdir da Trindade
Carvalho, Silvana Teixeira
Stahlhofer, Mariane
Cabral, Carla Heloisa Avelino
Damasceno, Matheus Leonardi
Barbizan, Mariana
author_role author
author2 Valente, Eriton Egidio Lisboa
Filipini, Valdir da Trindade
Carvalho, Silvana Teixeira
Stahlhofer, Mariane
Cabral, Carla Heloisa Avelino
Damasceno, Matheus Leonardi
Barbizan, Mariana
author2_role author
author
author
author
author
author
author
dc.contributor.author.fl_str_mv Araújo, Laylles Costa
Valente, Eriton Egidio Lisboa
Filipini, Valdir da Trindade
Carvalho, Silvana Teixeira
Stahlhofer, Mariane
Cabral, Carla Heloisa Avelino
Damasceno, Matheus Leonardi
Barbizan, Mariana
dc.subject.por.fl_str_mv Cattle
Intake
Nitrogen excretion
Urea.
Bovinos
Consumo
Excreção de nitrogênio
Urea.
topic Cattle
Intake
Nitrogen excretion
Urea.
Bovinos
Consumo
Excreção de nitrogênio
Urea.
description Balancing diets for protein affects both protein and energy use efficiency in cattle. This study aimed to evaluate the effects of dietary protein level on intake, digestibility and energy expenditure in Holstein heifers. Four Holstein heifers with a mean BW of 266.5 ± 10.7 kg were distributed in a 4 x 4 balanced Latin square design. Each period was comprised of 14 d for adaptation and 6 d for samplings. The heifers were fed diets with 9, 12, 15 and 18% of crude protein (CP). Total feces and urine were collected. Rumen fluid was collected at 2, 4, 6 and 8 h after feeding. The energy expenditure was evaluated at 6 a.m., 12 a.m., 6 p.m. and 12 p.m. by a closed-circuit mask technique. The intake of dry matter (DM), organic matter (OM) and neutral detergent fiber (NDF) were similar between treatments (P > 0.05). Although the NDF digestibility was not changed (P > 0.05), the digestibilities of DM, OM, CP, non-fibrous carbohydrates, and total digestible nutrients increased linearly (P < 0.05) with increasing CP levels in the diet. Urinary urea nitrogen excretion and nitrogen retained increased linearly (P < 0.01) with increasing CP levels. Dietary CP levels did not affect (P =0.53) energy expenditure in heifers. Ruminal ammonia-nitrogen concentration peaked at 2-4 h after feeding. Increasing dietary CP levels from 9 to 18% does not affect feed intake and energy expenditure in heifers. However, it improves the digestibility of OM and nitrogen retention.
publishDate 2020
dc.date.none.fl_str_mv 2020-11-06
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/38126
10.5433/1679-0359.2020v41n6Supl2p3211
url https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/38126
identifier_str_mv 10.5433/1679-0359.2020v41n6Supl2p3211
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/38126/28278
dc.rights.driver.fl_str_mv Copyright (c) 2020 Semina: Ciências Agrárias
http://creativecommons.org/licenses/by-nc/4.0
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2020 Semina: Ciências Agrárias
http://creativecommons.org/licenses/by-nc/4.0
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv UEL
publisher.none.fl_str_mv UEL
dc.source.none.fl_str_mv Semina: Ciências Agrárias; Vol. 41 No. 6Supl2 (2020); 3211-3224
Semina: Ciências Agrárias; v. 41 n. 6Supl2 (2020); 3211-3224
1679-0359
1676-546X
reponame:Semina. Ciências Agrárias (Online)
instname:Universidade Estadual de Londrina (UEL)
instacron:UEL
instname_str Universidade Estadual de Londrina (UEL)
instacron_str UEL
institution UEL
reponame_str Semina. Ciências Agrárias (Online)
collection Semina. Ciências Agrárias (Online)
repository.name.fl_str_mv Semina. Ciências Agrárias (Online) - Universidade Estadual de Londrina (UEL)
repository.mail.fl_str_mv semina.agrarias@uel.br
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