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

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.contributorUNIOESTE-
Autor(es): dc.contributorUFMT-
Autor(es): dc.creatorAraújo, Laylles Costa [UNESP]-
Autor(es): dc.creatorValente, Eriton Egidio Lisboa-
Autor(es): dc.creatorda Trindade Filipini, Valdir-
Autor(es): dc.creatorCarvalho, Silvana Teixeira-
Autor(es): dc.creatorStahlhofer, Mariane-
Autor(es): dc.creatorCabral, Carla Heloisa Avelino-
Autor(es): dc.creatorDamasceno, Matheus Leonardi-
Autor(es): dc.creatorBarbizan, Mariana-
Data de aceite: dc.date.accessioned2022-02-22T00:44:21Z-
Data de disponibilização: dc.date.available2022-02-22T00:44:21Z-
Data de envio: dc.date.issued2021-06-25-
Data de envio: dc.date.issued2021-06-25-
Data de envio: dc.date.issued2019-12-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.5433/1679-0359.2020v41n6Supl2p3211-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/205452-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/205452-
Descrição: dc.descriptionBalancing 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.-
Descrição: dc.descriptionUniversidade Estadual Paulista “Júlio de Mesquita Filho UNESP-
Descrição: dc.descriptionUniversidade Estadual do Oeste do Paraná UNIOESTE-
Descrição: dc.descriptionUNIOESTE-
Descrição: dc.descriptionInstituto de Ciências Agrárias e Tecnológicas Fundação Universidade Federal do Mato Grosso UFMT-
Descrição: dc.descriptionUniversidade Estadual Paulista “Júlio de Mesquita Filho UNESP-
Formato: dc.format3211-3223-
Idioma: dc.languageen-
Relação: dc.relationSemina:Ciencias Agrarias-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectCattle-
Palavras-chave: dc.subjectIntake-
Palavras-chave: dc.subjectNitrogen excretion-
Palavras-chave: dc.subjectUrea-
Título: dc.titleEffects of dietary protein level on intake, digestibility, and energy expenditure in dairy heifers-
Título: dc.titleEfeitos do nível de proteína na ingestão, digestibilidade, e gasto energético em novilhas leiteiras-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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