Fecal NIRS prediction of dietary protein percentage and in vitro dry matter digestibility in diets ingested by goats in Mediterranean scrubland

Landau, S.; Glasser, Tzach; Muklada, H.; Dvash, L.; Perevolotsky, Avi; Ungar, Eugene D.; Walker, John W.

doi:10.1016/j.smallrumres.2005.05.009

Cited by 24 publications

(21 citation statements)

References 19 publications

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“…Dietary intake and composition As reported previously for confined goats (Landau et al, 2005 and, FNIRS calibrations to predict dietary composition are more precise and accurate than those of absolute rates of intake (Table 5). Dixon and Coates (2009) reported on 25 studies in which FNIRS calibrations were developed for intake, and not even one was of adequate quality.…”

Section: Discussionsupporting

confidence: 68%

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Faecal near-IR spectroscopy to determine the nutritional value of diets consumed by beef cattle in east Mediterranean rangelands

Landau

Dvash

Roudman

et al. 2016

animal

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Rapid assessment of the nutritional quality of diets ingested by grazing animals is pivotal for successful cow-calf management in east Mediterranean rangelands, which receive unpredictable rainfall and are subject to hot-spells. Clipped vegetation samples are seldom representative of diets consumed, as cows locate and graze selectively. In contrast, faeces are easily sampled and their near-IR spectra contain information about nutrients and their utilization. However, a pre-requisite for successful faecal nearinfrared reflectance spectroscopy (FNIRS) is that the calibration database encompass the spectral variability of samples to be analyzed. Using confined beef cows in Northern and Southern Israel, we calibrated prediction equations based on individual pairs of known dietary attributes and the NIR spectra of associated faeces ( n = 125). Diets were composed of fresh-cut green fodder of monocots (wheat and barley), dicots (safflower and garden pea) and natural pasture collected at various phenological states over 2 consecutive years, and, optionally, supplements of barley grain and dried poultry litter. A total of 48 additional pairs of faeces and diets sourced from cows fed six complete mixed rations covering a wide range of energy and CP concentrations. Precision (linearity of calibration, R 2 cal, and of cross-validation, R 2 cv) and accuracy (standard error of cross-validation, SEcv) were criteria for calibration quality. The calibrations for dietary ash, CP, NDF and in vitro dry matter digestibility yielded R 2 cal values >0.87, R 2 cv of 0.81 to 0.89 and SEcv values of 16, 13, 39 and 31 g/kg dry matter, respectively. Equations for nutrient intake were of low quality, with the exception of CP. Evaluation of FNIRS predictions was carried out with grazing animals supplemented or not with poultry litter, and implementation of the method in one herd over 2 years is presented. The potential usefulness of equations was also established by calculating the Mahalanobis ( H) distance to the spectral centroid of a calibration population of 796 faecal samples collected throughout 2 years in four herds. Seasonal trends in pasture quality and responses to management practices were identified adequately and H < 3.0 for 98% of faecal samples collected. We conclude that the development of FNIRS equations with confined animals is not only unexpensive and ethically acceptable, but their predictions are also sufficiently accurate to monitor dietary composition (but not intake) of beef cattle in east Mediterranean rangelands.Keywords: nutrition, beef cattle, NIRS, monitoring, decision-making ImplicationsMarket globalization and climate changes threaten beef cattle grazing on east Mediterranean rangelands. Profitability requires adequate stocking rate and timely supplementation. Clipped samples of vegetation are seldom representative of the consumed diet. We present a methodology that obviates the need to obtain representative diet samples, based on the hypothesis that faeces contain ample information on diets consumed. We show ...

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Section: Discussionsupporting

confidence: 68%

“…In one such analysis it was found that H < 0.5 provided 95% confidence that the pair of goats selected the same diet; at pasture H was <3.0 in >80% of comparisons between resident goats and a focal goat grazing in the same paddock (Landau et al, 2005). This is not to rule out the possibility that larger H distances can be tolerated.…”

Section: Introductionmentioning

confidence: 99%

Faecal near-IR spectroscopy to determine the nutritional value of diets consumed by beef cattle in east Mediterranean rangelands

Landau

Dvash

Roudman

et al. 2016

animal

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“…The vegetation is dominated by low trees (mainly Phillyrea latifolia L.) and tall shrubs, mainly lentisk (Pistacia lentiscus L.) and Calicotome villosa Poir. Link, that can contribute over 60% of the plant matter ingested by goats (Landau et al 2005;Glasser et al 2008).…”

Section: Methodsmentioning

confidence: 99%

No Major Role for Binding by Salivary Proteins as a Defense Against Dietary Tannins in Mediterranean Goats

et al. 2010

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We investigated whether Mediterranean goats use salivary tannin-binding proteins to cope with tannin-rich forages by determining the affinity of salivary or parotid gland proteins for tannic acid or quebracho tannin. Mixed saliva, sampled from the oral cavity, or parotid gland contents were compared to the intermediate affinity protein bovine serum albumin with a competitive binding assay. Goats that consume tannin-rich browse (Damascus) and goats that tend to avoid tannins (Mamber) were sequentially fed high (Pistacia lentiscus L.), low (vetch hay), or zero (wheat hay) tannin forages. Affinity of salivary proteins for tannins did not differ between goat breeds and did not respond to presence or absence of tannins in the diet. Proteins in mixed saliva had slightly higher affinity for tannins than those in parotid saliva, but neither source contained proteins with higher affinity for tannins than bovine serum albumin. Similarly, 3 months of browsing in a tannin-rich environment had little effect on the affinity of salivary proteins for tannin in adult goats of either breed. We sampled mixed saliva from young kids before they consumed forage and after 3 months of foraging in a tannin-rich environment. Before foraging, the saliva of Mamber kids had higher affinity for tannic acid (but not quebracho tannin) than the saliva of Damascus kids, but there was no difference after 3 months of exposure to tannin-rich browse, and the affinity of the proteins was always similar to the affinity of bovine serum albumin. Our results suggest there is not a major role for salivary tannin-binding proteins in goats. Different tendencies of goat breeds to consume tannin-rich browse does not appear be related to differences in salivary tannin-binding proteins.

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“…It has been routinely used for prediction of chemical composition and energy value of feeds (Aufrère et al, 1996), intake and digestibility (Boval et al, 2003(Boval et al, , 2004Decruyenaere et al, 2003;Valiente et al, 2004;Landau et al, 2005), faecal concentration of n-alkanes in beef cattle (Garnsworthy and Unal, 2004) and deers (Ru et al, 2002), and seems to be a promising technique for estimation of diet composition in sheep and goats (Walker et al, 1998(Walker et al, , 2002(Walker et al, , 2007Landau et al, 2004;Valiente et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Validation of the n-alkane and NIRS techniques to estimate intake, digestibility and diet composition in sheep fed mixed lucerne: ryegrass diets

et al. 2008

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Fecal NIRS prediction of dietary protein percentage and in vitro dry matter digestibility in diets ingested by goats in Mediterranean scrubland

Cited by 24 publications

References 19 publications

Faecal near-IR spectroscopy to determine the nutritional value of diets consumed by beef cattle in east Mediterranean rangelands

Faecal near-IR spectroscopy to determine the nutritional value of diets consumed by beef cattle in east Mediterranean rangelands

No Major Role for Binding by Salivary Proteins as a Defense Against Dietary Tannins in Mediterranean Goats

Validation of the n-alkane and NIRS techniques to estimate intake, digestibility and diet composition in sheep fed mixed lucerne: ryegrass diets

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