Relationship between fecal crude protein concentration and diet organic matter digestibility in cattle1

Lukas, Monika; Südekum, Karl‐Heinz; Rave, Gerhard; Friedel, K.; Susenbeth, A.

doi:10.2527/2005.8361332x

Cited by 76 publications

(75 citation statements)

References 14 publications

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“…However, in these experiments, sward heights after grazing were 3.0 and 6.5 cm at 21 and 35 days of regrowth, respectively. This suggests that rams at pasture have access Estimation of OMD and OMI To compare intake and digestibility between indoor feeding and pasture grazing, the CPf method was used, because previous studies showed that this method can provide consistent estimates of in vivo OMD at pasture (Boval et al, 2003;Lukas et al, 2005;Schlecht and Susenbeth, 2006). Moreover, the range of variation in CPf in the dataset used to derive the CPf equation (from 7.9% to 20.3%; Fanchone et al, 2009) was similar to that observed in our study for both indoor animals (from 14.2% to 18.0% and from 13.2% to 16.2% at 21 and 35 days of regrowth, respectively) and grazing animals (from 14.3% to 17.5% and from 17.7% to 18.2% at 21 and 35 days of regrowth, respectively; data not shown).…”

Section: Discussionmentioning

confidence: 99%

Comparison of intake and digestibility of fresh Digitaria decumbens grass fed to sheep, indoors or at pasture, at two different stages of regrowth

Fanchone

Archimède

Delagarde

et al. 2012

Animal

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The effect of two feeding systems (indoors and at pasture) on intake and digestion of fresh grass was studied at two stages of regrowth (21 and 35 days of regrowth) in two parallel experiments. In Experiment 1, 10 adult Martinik rams weighing, on average, 50.5 (60.9) kg, including four fitted with rumen cannula, were randomly allocated to two groups according to a 2 3 2 Latin Square design. These rams consumed a 21-day regrowth of Digitaria decumbens grass diet during two successive 28-day periods, indoors (five rams) or at pasture (five tethered rams). In Experiment 2, 10 other Martinik rams weighing, on average, 45.5 (60.9) kg, including four fitted with rumen cannula, were randomly allocated to two groups according to a 2 3 2 Latin Square design. These rams consumed a 35-day regrowth of D. decumbens grass diet during two successive 28-day periods, either indoors (five rams) or at pasture (five tethered rams). For the indoors groups, in vivo organic matter digestibility (OMD) was measured by total collection of feces. In addition, OMD was estimated indoors and at pasture using the fecal CP (CPf ) method (OMD CPf ). Organic matter intake (OMI) was then estimated using OMD CPf and fecal organic matter output (OMI CPf ). Correlations of 0.49 and 0.77 were found between in vivo OMD and OMD CPf (P , 0.05) and between OMI and OMI CPf (P , 0.001), respectively. OMD CPf was 1.8% (P , 0.05) and 2.7% (P , 0.01) lower indoors than at pasture at 21 and 35 days of regrowth, respectively, whereas OMI CPf indoors was 1.1 and 1.16 times that registered at pasture at 21 and 35 days of regrowth, respectively. The higher OMD CPf at pasture was linked to the higher selective behavior of rams at pasture, whereas the differences in OMI CPf between the two feeding systems were linked to differences in the total bulk density of the grass. These studies show that differences in OMD CPf and OMI CPf exist between animals fed indoors and at pasture with the same forage and that these differences may vary according to the stage of regrowth of the grass offered.

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Section: Discussionmentioning

confidence: 99%

Comparison of intake and digestibility of fresh Digitaria decumbens grass fed to sheep, indoors or at pasture, at two different stages of regrowth

Fanchone

Archimède

Delagarde

et al. 2012

Animal

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“…For the purpose of utilising in vitro digestibility to estimate in vivo digestibility in the field, the regression equation in vivo dg = 1.01 (in vitro dg) + 8.48 could be used, although this would be specific for mixtures of these two species. Lukas et al (2005) used data from two digestibility trials, one in Germany with 257 individual comparisons (data set 1) and the other in Austria (188 comparisons, data set 2) to predict OM digestibility (y, %) using a regression based on the crude protein content of the faeces (x, g kg -1 ). The data were obtained from dairy and beef cattle confined in stalls with titanium oxide as an external indicator for faecal production.…”

Section: Resultsmentioning

confidence: 99%

Forage intake and botanical composition of feed for cattle fed Brachiaria/legume mixtures

Macedo

Tarré²,

Ferreira³

et al. 2010

Sci. agric. (Piracicaba, Braz.)

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A key contribution to study the cycling of nutrients in soil/plant/animal systems is the evaluation of the consumption of forage and their nutrients by cattle. The objective of this study was to test techniques to evaluate faecal production, in vitro digestibility, forage consumption and the proportion of legume in the acquired diet. Five Zebu steer calves were confined and fed five diets of different combinations of Brachiaria dictyoneura and Desmodium ovalifolium. All quantities of faeces were collected per animal and these values were found to compare favourably with those derived from using the chromium oxide technique. In vitro digestibility ranged from 7 to 10% higher than the actual in vivo digestibility. Faecal samples from steers fed with diets with 25% or more of grass in the mixture were found to be depleted in δ 13 C between 1.7 and 2.1‰, but no depletion was observed when the diet was 100% D. ovalifolium. There was a positive linear regression (r 2 = 0.97***) of the δ 13 C of the diet with the δ 13 C of faeces, but if the acquired diet contained a very high proportion of legume, the legume content could be underestimated by as much as 10%. None of the internal indicators, such as lignin or ash content of the diets, were useful to predict feed intake, but the chromium oxide external indicator performed satisfactorily. The 13 C analysis of the faeces was an effective predictor of the proportion of the legume in the consumed diet. Key words: Brachiaria dictyoneura, Desmodium ovalifolium, 13 C abundance, digestibility, forage intake Consumo e composição da forragem ingerida por bovinos alimentados com Brachiaria e uma leguminosa RESUMO: Uma contribuição fundamental para o estudo da ciclagem de nutrientes no sistema solo/planta/ animal é a avaliação do consumo pelo gado de forragem e dos nutrientes nela contidos. Testaram-se, sob condições controladas, técnicas para avaliar a produção fecal, digestibilidade in vitro, consumo de forragem e a proporção de leguminosa ingerida na dieta. Cinco novilhos de Zebu foram confinados e alimentados com quantidades conhecidas de cinco rações com diferentes proporções de Brachiaria dictyoneura e Desmodium ovalifolium. Todas as fezes bovinas foram recolhidas e pesadas e estes valores foram comparáveis com as estimativas da produção fecal derivadas do uso da técnica de óxido de cromo. A digestibilidade in vitro variou de 7 a 10% acima da digestibilidade in vivo atual. Amostras de fezes de novilhos alimentados com dietas com 25% ou mais de capim na mistura apresentaram abundância de 13 C por entre 1,7 e 2,1‰, mas este empobrecimento isotópico não foi observado quando a dieta era com 100% D. ovalifolium. Houve correlação positiva linear (r 2 = 0,97***) entre δ 13 C da dieta com o δ 13 C das fezes, mas o conteúdo de leguminosa foi subestimado em mais de 10% quando a dieta ingerida foi de 100% de leguminosa. Nenhum dos indicadores internos, como o conteúdo de lignina ou cinzas, foram úteis para prever o consumo de forragem, mas os resultados da técnica utilizando ó...

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“…In this way, the existing mathematical relation between digestibility values and the concentration of fecal N determined in conditions of confinement (Ferri et al, 2003) would also be seen for grazing conditions. Lukas et al (2005) found little effect of diet composition variation on the concentration of fecal N, and obtained a close relationship between OMD of and the concentration of fecal N. The main advantages of this technique are its reduced and simple analytical work and no need for diet sampling.…”

Section: Total Collection Of Feces and Omd Estimated By The Fecal N Imentioning

confidence: 91%

“…The ratio of N concentrations in fecal OM and OMD, relies on the reduction of fecal OM excretion and the increase in N fecal concentration when diet OM digestibility increases (Lukas et al, 2005). As a consequence, based on the value of NTF (g kg -1 OMI) and the concentration of N in fecal OM (cNF; g kg -1 OM), the quantity of forage OM that would determine 1000 g of fecal OM would be 1000 x cNF/NTF, and digestibility would be calculated as follow:…”

Section: Fecal N Indexmentioning

confidence: 99%

Comparison of Four Techniques to Estimate Forage Intake by Rams Grazing on a Panicum coloratum L. Pasture

Ferri

Stritzler

Brizuela

et al. 2008

Chilean J. Agric. Res.

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RESEARCH A B S T R A C TThe estimation of daily feed intake is important in the determination of animal production The objective of this experiment was to compare measurements of animal forage intake obtained by the use of four techniques: preand post-grazing difference in standing forage mass, total daily feces collection in combination with in vitro diet digestibility, total daily feces collection in combination with diet digestibility estimated by the fecal nitrogen index and the n-alkane technique. The experiment was carried out on a stockpiled Panicum coloratum L. pasture during two growing seasons. The treatments for the first season comprised standing forage mass accumulated after mid-October, mid-January and mid-February mechanical harvest to 8-cm stubble. In the second season, the treatments came from forage mass accumulated after mid-December, early January and February cuttings. Treatments were assigned at random to 0.5 ha plots in two replicates. The most closely correlated estimations of intake (r = 0.83; P < 0.01) were those obtained through total collection of feces and diet digestibility and the least with either the in vitro technique or the fecal N index. The apparent overestimation of intake by the n-alkane technique might be a consequence of the bias produced by forage sampling. In general terms, the techniques used to estimate intake were responsive to treatment effect.

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Relationship between fecal crude protein concentration and diet organic matter digestibility in cattle1

Cited by 76 publications

References 14 publications

Comparison of intake and digestibility of fresh Digitaria decumbens grass fed to sheep, indoors or at pasture, at two different stages of regrowth

Comparison of intake and digestibility of fresh Digitaria decumbens grass fed to sheep, indoors or at pasture, at two different stages of regrowth

Forage intake and botanical composition of feed for cattle fed Brachiaria/legume mixtures

Comparison of Four Techniques to Estimate Forage Intake by Rams Grazing on a Panicum coloratum L. Pasture

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