Effects of dietary protein level on intake, digestibility, and energy expenditure in dairy heifers
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , , , , |
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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Semina. Ciências Agrárias (Online) |
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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 |
_version_ |
1799306082249605120 |