Substitution of rumen degradable nitrogen with urea in sheep fed low quality Eragrostis curvula hay
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...
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| Format: | Article |
| Language: | English |
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Universidade de São Paulo
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| Series: | Scientia Agricola |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000600498&lng=en&tlng=en |
| _version_ | 1811236775350239232 |
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| author | Herman Mynhardt Willem Adriaan Van Niekerk Lourens Johannes Erasmus Abubeker Hassen Roelf Johannes Coertze |
| author_facet | Herman Mynhardt Willem Adriaan Van Niekerk Lourens Johannes Erasmus Abubeker Hassen Roelf Johannes Coertze |
| author_sort | Herman Mynhardt |
| collection | DOAJ |
| description | 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 dL−1 vs. 7.41 mg dL−1); 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. |
| first_indexed | 2024-04-12T12:15:00Z |
| format | Article |
| id | doaj.art-c87f89e2f71540c1ad66de97227d2b54 |
| institution | Directory Open Access Journal |
| issn | 1678-992X |
| language | English |
| last_indexed | 2024-04-12T12:15:00Z |
| publisher | Universidade de São Paulo |
| record_format | Article |
| series | Scientia Agricola |
| spelling | doaj.art-c87f89e2f71540c1ad66de97227d2b542022-12-22T03:33:28ZengUniversidade de São PauloScientia Agricola1678-992X73649850410.1590/0103-9016-2015-0277S0103-90162016000600498Substitution of rumen degradable nitrogen with urea in sheep fed low quality Eragrostis curvula hayHerman MynhardtWillem Adriaan Van NiekerkLourens Johannes ErasmusAbubeker HassenRoelf Johannes CoertzeABSTRACT 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 dL−1 vs. 7.41 mg dL−1); 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.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000600498&lng=en&tlng=enlow quality roughagerumen ammoniamicrobial synthesis |
| spellingShingle | Herman Mynhardt Willem Adriaan Van Niekerk Lourens Johannes Erasmus Abubeker Hassen Roelf Johannes Coertze Substitution of rumen degradable nitrogen with urea in sheep fed low quality Eragrostis curvula hay Scientia Agricola low quality roughage rumen ammonia microbial synthesis |
| title | Substitution of rumen degradable nitrogen with urea in sheep fed low quality Eragrostis curvula hay |
| title_full | Substitution of rumen degradable nitrogen with urea in sheep fed low quality Eragrostis curvula hay |
| title_fullStr | Substitution of rumen degradable nitrogen with urea in sheep fed low quality Eragrostis curvula hay |
| title_full_unstemmed | Substitution of rumen degradable nitrogen with urea in sheep fed low quality Eragrostis curvula hay |
| title_short | Substitution of rumen degradable nitrogen with urea in sheep fed low quality Eragrostis curvula hay |
| title_sort | substitution of rumen degradable nitrogen with urea in sheep fed low quality eragrostis curvula hay |
| topic | low quality roughage rumen ammonia microbial synthesis |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000600498&lng=en&tlng=en |
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