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

journal contribution
posted on 18.11.2020, 00:00 authored by J de Souza, F Batistel, KC Welter, MM Silva, DF Costa, FA Portela Santos
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. © 2014, Springer Science+Business Media Dordrecht.

Funding

Other

History

Volume

47

Issue

1

Start Page

265

End Page

268

eISSN

1573-7438

ISSN

0049-4747

Publisher

Springer

Peer Reviewed

Yes

Open Access

No

Acceptance Date

10/09/2014

External Author Affiliations

University of São Paulo, Brazil

Era Eligible

Yes

Journal

Tropical Animal Health and Production

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