Relationships between chemical components of veld herbage and in vitro digestibility and estimated intakes of dry matter and digestible dry matter by sheep and cattle

Cilliers, Elizelle Juaneé; Merwe, H.J. van der

doi:10.1016/0377-8401(93)90075-u

Cited by 13 publications

(7 citation statements)

References 15 publications

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“…The reason for this is not clear, since several authors have shown that NDF, ADF and ADL concentrations increase with stage of maturity (Garcell & Poppe, 1989;Buxton, 1991;Jung & Vogel, 1992;Kephart & Buxton, 1993;Hatfield et al, 1994). Digestibility decreased with level of maturity in all seasons except winter (Table 2) in agreement with reports showing that a decrease in N content and an increase in NDF, ADF and ADL content is associated with a decrease in digestibility (Ford et al, 1979;Cilliers & Van der Merwe, 1993). Digestible organic matter intake (DOMI) decreased from young to mature pastures in summer and autumn (Table 3).…”

Section: Resultssupporting

confidence: 78%

“…The decrease in quality of the material selected (Table 2) corresponded well with the decrease in intake. Van Soest (1965) and Cilliers & Van der Merwe (1993) reported similar results for animals grazing pastures of decreasing quality. Laredo & Minson (1973) and Minson (1982) reported a negative relationship between intake and the NDF, ADF and ADL content of grasses, however Minson (1971), Laredo & Minson (1973) and Minson (1982) noted a positive relationship between digestibility and intake.…”

Section: Resultsmentioning

confidence: 71%

“…The decrease in quality and intake with advancing stage of pasture maturity is well documented (Minson, 1972;Aii & Stobbs, 1980;Garcell & Poppe, 1989;Wan Hassan et al, 1990;Cilliers & Van der Merwe, 1993;Kabunga & Darko, 1993). Although there are numerous reports on the effect of stage of maturity on the nutritive value of tropical pastures, there is a paucity of data for P. maximum cv.…”

Section: Introductionmentioning

confidence: 96%

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An evaluation of Panicum maximum cv. Gatton: 2. The influence of stage of maturity on diet selection, intake and rumen fermentation in sheep

Relling¹,

Niekerk²,

Coertze³

et al. 2001

SA J. An. Sci.

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The aim of the study was to evaluate the nutritional value of Panicum maximum cv. Gatton for sheep production in three different seasons and at three different stages of maturity. More mature pasture, compared to younger pasture, resulted in lower quality being selected. This was reflected in lower N values, lower digestibility and higher NDF, ADF and ADL values in selected material. Digestible organic matter intake (DOMI) also decreased with maturity. Grazing of more mature pasture resulted in lower rumen ammonia nitrogen (NH 3 -N) levels and higher acetic:propionic acid ratios. This trend was noted in all seasons. The nutritional value of the pasture in summer was high enough to meet at least the maintenance requirements of sheep in all stages of maturity evaluated. The nutritional value of the young and medium mature autumn pasture was also high enough to meet at least the maintenance requirements, but at the mature stage intake was too low. Intake in winter at all stages of maturity, was too low to meet the maintenance requirements of sheep.

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Section: Resultssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 96%

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An evaluation of Panicum maximum cv. Gatton: 2. The influence of stage of maturity on diet selection, intake and rumen fermentation in sheep

Relling¹,

Niekerk²,

Coertze³

et al. 2001

SA J. An. Sci.

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“…(). The significant negative effect of CP on total gas volume ( r = −0·39) is, however, in contrast with the expected positive association between CP and in vitro OMD in grasses and browse species (Cilliers and van der Merwe, ; Kaitho et al ., ; Datt et al ., ). A similar negative correlation between CP and in vitro total gas volume in browse species was also reported by Kumara Mahipala et al .…”

Section: Discussionmentioning

confidence: 81%

Chemical composition and in vitro total gas and methane production of forage species from the Mid Rift Valley grasslands of Ethiopia

Bezabih

Pellikaan

Tolera

et al. 2013

Grass and Forage Science

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There is increasing interest in sustainable land use in the tropics to optimize animal production while also reducing methane (CH4) emissions, but information on nutritive value and CH4‐emission potential of tropical forage species is limited. Samples of 24 grasses and five other forages were collected during the main rainy season on randomly positioned quadrats in semi‐arid grassland in the Mid Rift Valley of Ethiopia. Samples were pooled by species, analysed for chemical composition and incubated with rumen fluid to determine total gas and CH4‐emission potentials using a fully automated in vitro gas production apparatus. Organic matter digestibility (OMD) and metabolizable energy (ME) contents were calculated from chemical composition and gas production data. Large variability was observed among forages for all nutritional variables considered. The grasses Eleusine multiflora, Pennisetum stramineum, Dactyloctenium aegyptium, Eragrostis aspera, Cenchrus ciliaris and Eragrostis cilianensis showed relatively high OMD (68–72%) and ME values (9·1–10·2 MJ kg−1 dry matter). Melinis repens, E. multiflora and the non‐legume forb Zaleya pentandra showed relatively low CH4 to total gas ratios; these species may have potential for use in low CH4‐emission forage diets. Acacia tortilis fruits had high content of crude protein and moderate ME values, and may be an ideal feed supplement for the grazing ruminant. Sodium content was below the recommended level for ruminants in all the forage species. Overall, the pasture stand during the main growing season was evaluated as having moderate nutritional quality.

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“…The rate of change in species composition on fertilized rangeland, is largely a function of the amount of N applied (Visser, 1966;Tainton et al, 2000). With smaller amounts of N in semi-arid rangeland, this process could range between 3 and 5 years (Edwards & Nel, 1973;Cilliers & Van der Merwe, 1993;) compared to only one season when high levels of N are applied (Tainton et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Short-term response of rangeland botanical composition and productivity to fertilization (N and P) in a semi-arid climate of South Africa

Snyman

2002

Journal of Arid Environments

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Relationships between chemical components of veld herbage and in vitro digestibility and estimated intakes of dry matter and digestible dry matter by sheep and cattle

Cited by 13 publications

References 15 publications

An evaluation of Panicum maximum cv. Gatton: 2. The influence of stage of maturity on diet selection, intake and rumen fermentation in sheep

An evaluation of Panicum maximum cv. Gatton: 2. The influence of stage of maturity on diet selection, intake and rumen fermentation in sheep

Chemical composition and in vitro total gas and methane production of forage species from the Mid Rift Valley grasslands of Ethiopia

Short-term response of rangeland botanical composition and productivity to fertilization (N and P) in a semi-arid climate of South Africa

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