Ytterbium oxide has the same accuracy as chromic oxide for estimating variations of faecal dry matter output in dairy cows fed a total mixed ration at two feeding levels

Delagarde, Rémy; Pérez-Ramírez, E.; Peyraud, Jean‐Louis

doi:10.1016/j.anifeedsci.2010.08.006

Cited by 22 publications

(17 citation statements)

References 20 publications

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“…Indeed, faecal Yb recovery did not vary with the feeding level, and the relative changes in FO were well estimated by Yb. This result has already been observed with Cr 2 O 3 (Carruthers and Bryant, 1983;Delagarde et al, 2010) and with Yb 2 O 3 (Delagarde et al, 2010). The latter group of authors observed that faecal Yb concentration, as well as Cr 2 O 3 , was highly correlated to the daily variation of FO during a nonsteady-state transition period from 100% to 70% ad libitum feeding level.…”

Section: Discussionsupporting

confidence: 62%

“…Consequently, if the Yb/faecal index method failed to correctly estimate the effect of feeding level, this was not due to Yb per se but rather due to an underestimation of the variation in OM digestibility between feeding levels. The average faecal Yb recovery (0.92) was similar to that found by Delagarde et al (2010) when provided as Yb 2 O 3 in dairy cows fed on total mixed ration. This suggests that using a correction factor of 0.92 would improve FO estimation when using Yb 2 O 3 as an external marker in grazing studies.…”

Section: Discussionsupporting

confidence: 60%

“…Delagarde et al (2010) reported, in dairy cows, within-day relative variations of faecal Yb concentration of approximately 85% to 115%, irrespective of the feeding level, similar to Cr 2 O 3 . Prigge et al (1981) also reported, with one or two daily administrations of Yb and Cr, within-day relative variations of faecal Yb and Cr of 80% to 120%.…”

Section: Discussionmentioning

confidence: 99%

“…For the FO/indigestibility method, FO was estimated from Yb 2 O 3 (Delagarde et al, 2010). Indigestibility was estimated from faecal nitrogen and ADF concentrations used as faecal indices to estimate organic matter (OM) digestibility by multiple regression (Peyraud, 1997;Ribeiro Filho et al, 2005).…”

Section: Methodsmentioning

confidence: 99%

“…Its use in grazing studies could, however, be arguable as Ti is normally present in soil and can be used to estimate soil intake in grazing animals (Fries et al, 1982). Recently, ytterbium oxide (Yb 2 O 3 ) has been found to be as accurate as Cr 2 O 3 for estimating short-term and long-term variations of FO in dairy cows fed at different feeding levels (Delagarde et al, 2010). Pasture digestibility is conventionally determined using an in vitro technique or from faecal composition, mainly nitrogen concentration (see the reviews of Gordon, 1995;Peyraud, 1997;Penning, 2004).…”

Section: Introductionmentioning

confidence: 99%

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N-alkanes v. ytterbium/faecal index as two methods for estimating herbage intake of dairy cows fed on diets differing in the herbage : maize silage ratio and feeding level

Pérez-Ramírez

Peyraud

Delagarde

2012

Animal

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The aim of this study was to compare the n-alkanes and the ytterbium (Yb)/faecal index techniques as two methods for estimating the herbage intake of dairy cows fed indoors on different herbage : supplement ratios and feeding levels. The supplement was a mixture of maize silage and soyabean meal (ratio of 87 : 13 on a dry matter (DM) basis). In all, four treatments were studied. The herbage : supplement ratio in the diet was 25 : 75, 50 : 50, 75 : 25 and 50 : 50 for treatments 1, 2, 3 and 4, respectively. Animals were offered for treatments 1, 2 and 3, 100% of ad libitum intake measured before the experiment and 70% of ad libitum intake for treatment 4. Cows were fed herbage in the morning and supplement in the evening. A total of six lactating Holstein dairy cows were used in a 4 3 4 Latin square with four 14-day periods. Herbage and supplement intakes, faecal output (FO), in vivo organic matter (OM) digestibility and faecal recovery of markers were measured on the last 5 days of each period. Intake was estimated with the two methods and from two faecal sampling techniques, that is, total faecal collection v. grab sampling during milking. Mean herbage intake as fed, or estimated from n-alkanes or from the Yb/faecal index was 7.7, 8.1 and 10.2 kg DM, respectively. The mean prediction error, expressed as a fraction of actual herbage intake, was 0.10 and 0.50 for the n-alkanes and Yb/faecal index methods, respectively. The n-alkanes method clearly showed much better accuracy than the Yb/faecal index method for estimating intake, irrespective of the faecal sampling method, herbage : silage proportion or feeding level. For the nalkanes method, herbage intake was slightly overestimated (7%) when herbage proportion in the diet was high, due to a ratio of faecal C 33 : C 32 recovery .1. The high bias for the Yb/faecal index was due to the cumulative effect of overestimation of FO (mean recovery of Yb 5 0.92) and underestimation of the diet indigestible fraction (28%). Between-treatment variations of FO were on average well estimated by Yb. Between-treatment variations of OM digestibility estimated using the faecal index technique were lower than those observed in vivo. It is concluded that intake of grazing dairy cows receiving high levels of maize silage supplement should be estimated using the n-alkanes method.

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Section: Discussionsupporting

confidence: 62%

Section: Discussionsupporting

confidence: 60%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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N-alkanes v. ytterbium/faecal index as two methods for estimating herbage intake of dairy cows fed on diets differing in the herbage : maize silage ratio and feeding level

Pérez-Ramírez

Peyraud

Delagarde

2012

Animal

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Evaluation of external markers to estimate fecal excretion, intake, and digestibility in dairy cows

Souza

Batistel

Welter

et al. 2014

Trop Anim Health Prod

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The objective of this study was to compare the use of an external marker titanium dioxide (TiO₂) as an alternative to chromic oxide (Cr₂O₃) in dairy cows. Four dairy cows were allocated in individual pens and fed concentrate supplement and Pennisetum purpureum cv. Cameroon cut daily. Fecal excretion, forage and total dry matter (DM) intakes, and digestibility were measured and estimated with TiO₂ and Cr₂O₃. Chromic oxide overestimated and TiO₂ tended to overestimate fecal excretion compared with total fecal collection. Forage and total DM intakes were overestimated by Cr₂O₃. The apparent DM digestibility was underestimated by Cr₂O₃ and TiO₂. The organic matter (OM) digestibility was underestimated by both markers. There were greater mean bias, mean squared prediction error, and root of the mean squared prediction errors for all parameters estimated with Cr₂O₃. In conclusion, estimates using TiO₂ were more precise and accurate indicating that it can replace Cr₂O₃ as an external marker for grazing dairy cows.

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Effect of marker dosage frequency and spot fecal sampling frequency in the prediction accuracy of fecal output using chromic oxide and titanium dioxide in grazing BON steers

et al. 2021

Trop Anim Health Prod

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Ytterbium oxide has the same accuracy as chromic oxide for estimating variations of faecal dry matter output in dairy cows fed a total mixed ration at two feeding levels

Cited by 22 publications

References 20 publications

N-alkanes v. ytterbium/faecal index as two methods for estimating herbage intake of dairy cows fed on diets differing in the herbage : maize silage ratio and feeding level

N-alkanes v. ytterbium/faecal index as two methods for estimating herbage intake of dairy cows fed on diets differing in the herbage : maize silage ratio and feeding level

Evaluation of external markers to estimate fecal excretion, intake, and digestibility in dairy cows

Effect of marker dosage frequency and spot fecal sampling frequency in the prediction accuracy of fecal output using chromic oxide and titanium dioxide in grazing BON steers

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