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Substitution of rumen degradable nitrogen with urea in sheep fed low quality Eragrostis curvula hay
Mynhardt, Herman; Niekerk, Willem Adriaan Van; Erasmus, Lourens Johannes; Hassen, Abubeker; Coertze, Roelf Johannes.
Afiliação
  • Mynhardt, Herman; University of Pretoria. Dept. of Animal and Wildlife Sciences. Pretoria. ZA
  • Niekerk, Willem Adriaan Van; University of Pretoria. Dept. of Animal and Wildlife Sciences. Pretoria. ZA
  • Erasmus, Lourens Johannes; University of Pretoria. Dept. of Animal and Wildlife Sciences. Pretoria. ZA
  • Hassen, Abubeker; University of Pretoria. Dept. of Animal and Wildlife Sciences. Pretoria. ZA
  • Coertze, Roelf Johannes; University of Pretoria. Dept. of Animal and Wildlife Sciences. Pretoria. ZA
Sci. agric ; 73(6): 498-504, 2016. tab
Article em En | VETINDEX | ID: biblio-1497608
Biblioteca responsável: BR68.1
Localização: BR68.1
ABSTRACT
The aim of the present study was to determine whether sunflower meal (SFM), a highly rumen degradable protein (RDP) source, can be substituted with non-protein nitrogen (NPN, urea) without impacting negatively on intake, digestibility, rumen fermentation and microbial nitrogen (N) synthesis (MNS) in wethers consuming low quality Eragrostis curvula hay. Five wethers were fed ad libitum, low quality hay and supplemented twice-daily in equal proportions, via the rumen cannulae, one of five iso-nitrogenous and iso-energetic supplements in a 5 × 5 Latin square design experiment. The supplements differed in the ratios of rumen degradable N (RDN) supplied by either SFM and/or urea and is presented as percentage of RDN supplied by urea T0 (100 % SFM, 0 % urea); T15 (85 % SFM, 15 % urea); T30 (70 % SFM, 30 % urea); T45 (55 % SFM, 45 % urea) and T60 (40 % SFM, 60 % urea). Forage intake and total tract dry matter (DM) digestibility did not differ; however, higher forage neutral detergent fiber (NDF) digestibilities were observed in the sheep supplemented with the higher urea-treatments (T45 and T60) compared to T15. Neither rumen pH nor total rumen volatile fatty acid (VFA) concentraions differed. The mean rumen ammonia nitrogen (RAN) concentration of the sheep supplemented with T60 was higher than T30 (9.35 mg dL1 vs. 7.41 mg dL1); however, no differences were observed in MNS or efficiency of MNS among treatments. Results suggest that up to 60 % of RDN supplied by SFM can be substituted with urea, without affecting intake, digestibility or MNS in wethers fed a low quality tropical hay.
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Texto completo: 1 Base de dados: VETINDEX Assunto principal: Ovinos / Eragrostis / Dieta / Ração Animal Limite: Animals Idioma: En Revista: Sci. agric Ano de publicação: 2016 Tipo de documento: Article
Texto completo
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Texto completo: 1 Base de dados: VETINDEX Assunto principal: Ovinos / Eragrostis / Dieta / Ração Animal Limite: Animals Idioma: En Revista: Sci. agric Ano de publicação: 2016 Tipo de documento: Article