The indirect estimation of the digestibility in cattle of herbage from Belgian permanent pasture

Bartiaux-Thill, Nicole; Oger, Robert

doi:10.1111/j.1365-2494.1986.tb01813.x

Cited by 11 publications

(4 citation statements)

References 11 publications

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“…Moreover it was more reliable when used at pasture to predict OMD and OMI from CPf and faecal output for heifers grazing the same grass. There are fewer published hyperbolic models (Lancaster 1949;Wehausen 1995) than linear or quadratic models predicting OMD from CPf (Langlands et al 1963;Greenhalgh et al 1966;Streeter 1969;Thomas & Campling 1976;Barthiaux-Thill & Oger 1986). However, the hyperbolic model may be based on a biological relationship between digestibility and metabolic faecal protein (MFP), as first proposed by Lancaster (1949).…”

Section: Om Digestibility Prediction From Cpf Contentmentioning

confidence: 99%

The ability of faecal nitrogen to predict digestibility for goats and sheep fed with tropical herbage

Boval¹,

Archimède

Fleury

et al. 2003

J. Agric. Sci.

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SU MMARYFaecal indices were evaluated to assess organic matter digestibility (OMD) for small ruminants fed with Digitaria decumbens. A continuous digestibility trial was conducted with five Creole bucks and five Black-belly rams, fed with fresh cut Digitaria decumbens from 15 to 70 days of re-growth. The amount of herbage offered, the refusals and the faeces were weighed daily for each animal during 55 days. Herbage and faeces samples were kept to determine dry and organic matter (DM and OM), crude protein (CP), neutral and acid detergent fibre (NDF and ADF) and lignin contents (ADL). OMD was calculated per week and per animal. Predictive regressions of OMD were calculated for each species, from all the faecal components measured (CPf, NDFf, ADFf and ADLf ), using linear or curvilinear models. Regressions from CPf had the lowest residual standard error (<0 . 028) when calculated for each species, compared with regressions from the other faecal components. Among the regressions from CPf, the lowest standard error of the predictive parameters was obtained with a model in the form of a-b/CPf, for each species. The latter allows prediction of OMD at pasture, consistent with theoretical energy requirement for both goats and ewes grazing a Digitaria decumbens based sward.

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Section: Om Digestibility Prediction From Cpf Contentmentioning

confidence: 99%

The ability of faecal nitrogen to predict digestibility for goats and sheep fed with tropical herbage

Boval¹,

Archimède

Fleury

et al. 2003

J. Agric. Sci.

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“…First, body condition scoring (BCS) enables an estimation of the individual animal's health and dietary situation by assessing muscular and fatty deposits in a rapid, non-invasive way [20]. Second, the digestibility of organic matter (OMD) and the faecal carbon to nitrogen (C/N) ratio derived from faecal N and organic matter (OM) are common indicators for the nutritional and energy value of ingested feed [21][22][23][24][25][26][27]. The prediction of feed organic matter digestibility (OMD) is based on a direct relationship between feed-N and faecal N [22,23,28,29].…”

Section: Of 14mentioning

confidence: 99%

Drought-Induced Challenges and Different Responses by Smallholder and Semicommercial Livestock Farmers in Semiarid Limpopo, South Africa—An Indicator-Based Assessment

2022

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Increased seasonal climatic variability is a major contributor to uncertainty in livestock-based livelihoods across Southern Africa. Erratic rainfall patterns and prolonged droughts have resulted in the region being identified as a climate ‘vulnerability hotspot’. Based on fieldwork conducted in the dry seasons in a semiarid region of South Africa, we present an interdisciplinary approach to assess the differential effects of drought on two types of livestock systems. Organic matter digestibility, faecal crude protein, C/N ratio and the natural abundance of faecal 15N and 13C isotopes were used as ecophysiological feed quality indicators between smallholder and semicommercial systems. These measurements were complemented with qualitative surveys. In a novel approach, we tested the potential of the isotopic signature to predict feed quality and present a significant relationship between organic matter digestibility and isotopic ratios. Indicators assessed smallholder feed quality to be significantly higher than semicommercial feed. However, animals from semicommercial farms were in significantly better condition than those from smallholding farms. Differential access to feed resources suggests that a complex feed–water–land nexus pushes smallholders into high reliance on off-farm supplements to bridge drought-induced feed deficits. The paper thus offers a contribution to intersectional work on drought effects on livestock keepers of semiarid South Africa and illustrates how ecophysiological indicators mirror socioeconomic differences.

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“…Foi observado que a excreção de N de origem endógena, estimada como a concentração total de N menos o N presente na fibra em detergente neutro, representou 77±7% do N fecal total, e que a excreção de ambos, N total e N endógeno, foi variável como proporção do peso vivo dos animais (médias±desvio padrão de 193±61 e 150±51 mg/kg de peso vivo, respectivamente). Em função disto, foi observado uma precisão com base na concentração fecal de indicadores, como o nitrogênio (Lancaster, 1949;Bartiaux-Thill & Oger, 1986;Comeron & Peyraud, 1993, Boval et al, 1996Lukas et al, 2005). Esta técnica assume que o teor de N nas fezes varia inversamente à quantidade de matéria seca fecal excretada (Demarquilly et al, baixa relação entre concentração fecal de N e digestibilidade da MO (Figura 8).…”

Section: Estimativa Da Digestibilidade a Partir De Amostras Da Forragemunclassified

“…A MSi, FDAi e FDNi, por sua vez, têm sido mais frequentemente testados e utilizados. O grau de recuperação e, deste modo, a precisão e exatidão das estimativas de digestibilidade e consumo utilizando estes indicadores tem sido variável (Berchielli et al, 2005;Rodrigues et al, 2006). Isto ocorre porque estas frações não constituem unidades químicas uniformes e constantes em todos os alimentos, e tampouco há um método padrão definido para sua determinação (Lippke, 2002).…”

Section: A) B)unclassified

Avanços metodológicos na determinação do consumo de ruminantes em pastejo

et al. 2007

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RESUMO -Avanços metodológicos são, usualmente, conseqüência direta de avanços conceituais e tecnológicos.No caso da estimativa do consumo em pastejo, os recentes avanços conceituais relativos ao processo de busca e apreensão da forragem pelo ruminante evidenciaram a importância da unidade básica do consumo -o bocado -, e dos fatores limitantes ao consumo que ocorrem antes da ingestão da forragem pelo animal em pastejo. A abordagem reducionista do processo de pastejo, aliada à sua hierarquização espaço-temporal, trouxeram uma nova concepção de como o animal obtém o seu alimento do pasto. Destes modelos conceituais emergiram novas variáveis que requerem novos procedimentos experimentais e analíticos. Neste contexto, importantes avanços têm ocorrido. Este artigo apresenta e discute os novos procedimentos que permitem estimar o consumo no curto prazo, assim como aqueles mais utilizados pela comunidade científica nacional para estimar o consumo no longo prazo. Adicionalmente, são feitas também considerações sobre o uso de animais ou de piquetes como unidades experimentais em experimentos de pastejo. Conclui-se que, apesar de ainda existir importantes barreiras metodológicas, os recentes avanços conceituais sobre o processo de pastejo, assim como dos procedimentos analíticos, geram fortes expectativas de avanço em curto e médio prazo na obtenção de estimativas qualificadas de consumo por animais em pastejo.Palavras chave: alcanos, bocado, estrutura do pasto, ingestão, óxido de cromo Advances in methods for determining animal intake on pasture ABSTRACT -Methodological advances are usually a direct consequence of conceptual and technical advances.In the case of animal intake on pasture, recent conceptual advances regarding the process of searching and apprehension of the forage by the ruminant provide insight regarding the importance of the basic unit of intake, the bite, and the importance of processes limiting intake that occur before the forage reaches the rumen. Applying a reductionist approach to the grazing process, along with its spatial-temporal hierarchy, brought a new conceptualization of how an animal obtains feed from pasture. From the conceptual models emerged new variables that required new experimental and analytical procedures. Within this context, important advances have occurred. This article describes the new procedures that allow to estimate the consumption on the short-term, as well as that most utilized by the national scientific community for estimating the consumption on the long-term. Procedure for estimating fecal production and digestibility are discussed, as well as the use of n-alkanes and other emerging techniques. Consideration is given to the use of animals or paddocks as experimental units in grazing experiments. The conclusions presented in this article do not differ from those of preceding articles regarding this subject. In a grazing condition, continuous intake is the "black box" to be revealed, complex by nature with regard to the animal as well as the pasture, and there are importa...

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The indirect estimation of the digestibility in cattle of herbage from Belgian permanent pasture

Cited by 11 publications

References 11 publications

The ability of faecal nitrogen to predict digestibility for goats and sheep fed with tropical herbage

The ability of faecal nitrogen to predict digestibility for goats and sheep fed with tropical herbage

Drought-Induced Challenges and Different Responses by Smallholder and Semicommercial Livestock Farmers in Semiarid Limpopo, South Africa—An Indicator-Based Assessment

Avanços metodológicos na determinação do consumo de ruminantes em pastejo

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