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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Evaluating internal and external markers versus fecal sampling procedure interactions when estimating intake in dairy cows consuming a corn silage-based diet

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Author(s):
Velasquez, A. V. [1] ; da Silva, G. G. [1] ; Sousa, D. O. [1] ; Oliveira, C. A. [1] ; Martins, C. M. M. R. [1] ; dos Santos, P. P. M. [1] ; Balieiro, J. C. C. [1] ; Renno, F. P. [1] ; Fukushima, R. S. [1]
Total Authors: 9
Affiliation:
[1] Univ Sao Paulo, Fac Med Vet & Zootecnia, Dept Nutr & Prod Anim, Av Duque de Caxias 225, BR-13630900 Pirassununga, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: JOURNAL OF DAIRY SCIENCE; v. 101, n. 7, p. 5890-5901, JUL 2018.
Web of Science Citations: 4
Abstract

Feed intake assessment is a valuable tool for herd management decisions. The use of markers, either internal or external, is currently the most used technique for estimating feed intake in production animals. The experiment used 10 multiparous Holstein cows fed a corn silage-based diet, with 55:45 forage-to-concentrate ratio, the average fecal recovery (FR) of TiO2 was higher than FR of Cr2O3, and both FR were more than unity. With internal markers, acetyl bromide lignin and cutin FR were lower than unity, and average FR for indigestible neutral detergent fiber (iNDF) and indigestible acid detergent fiber (iADF) was 1.5. The FR was unaffected by the fecal sampling procedure and appears to be an intrinsic property of each molecule and how it interacts with digesta. Of the 2 external markers, only Cr2O3 produced accurate fecal output (FO) estimates and the same happened to dry matter digestibility (DMD) when iNDF and iADF were used. Estimates for DMD and FO were affected by sampling procedure; 72-h bulk {[}sub-sample from total feces collection (TFC)] sampling consistently produced accurate results. The grab (sub-samples taken at specific times during the day) sampling procedures were accurate when using either of the indigestible fibers (iNDF or iADP) to estimate DMD. However, grab sampling procedures can only be recommended when concomitant TFC is performed on at least one animal per treatment to determine FR. Under these conditions, Cr2O3 is a suitable marker for estimating FO, and iNDF and iADF are adequate for estimating DMD. Moreover, the Cr2O3+iADF marker pair produces accurate dry matter intake estimates and deserves further attention in ruminant nutrition studies. The method of dosing the external markers is extremely important and greatly affects and determines results. Whichever the method, it must allow the animals to display normal feeding behavior and not affect performance. The grab sampling procedures can replace TFC (once FR is established), which may open new possibilities for pasture-based or collectively housed animals. (AU)

FAPESP's process: 13/07430-0 - Studies aiming to validate the acetyl bromide lignin method for quantification of lignin content in tropical forages
Grantee:Romualdo Shigueo Fukushima
Support Opportunities: Regular Research Grants