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The apparent digestibility of Atriplex barclayana and its effect on nitrogen balance in sheep

Published online by Cambridge University Press:  02 September 2010

R. W. Benjamin ,
E. Oren ,
E. Katz  and
K. Becker
R. W. Benjamin
Affiliation:
Department of Natural Resources, Agricultural Research Organization, Bet Dagan 50250, Israel
E. Oren
Affiliation:
Department of Natural Resources, Agricultural Research Organization, Bet Dagan 50250, Israel
E. Katz
Affiliation:
Institutes for Applied Research, Ben-Gurion University of the Negev, Beer Sheva 84110, Israel
K. Becker
Affiliation:
Institute for Animal Production in the Tropics and Subtropics, University of Hohenheim, 7000 Stuttgart 70, Germany
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Abstract

An in vivo digestibility trial was conducted by feeding sheep the leaves, fruits and twigs of Atriplex barclayana in a proportion roughly equivalent to that eaten by sheep grazing freely in Atriplex plantations. Four treatments were imposed on each of four sheep in a 4 × 4 Latin-square experimental design: Atriplex offered alone or with 100, 200 or 300 g/day tapioca meal.

The mean apparent digestibility of the Atriplex dry matter (DM) and organic matter (OM) consumed were 0·59 and 0·56, respectively. Addition of tapioca to the Atriplex in the diet did not improve these digestibility coefficients. The low OM content of 760 g/kg together with its digestibility of 0·56 resulted in the Atriplex having a low metabolizable energy concentration of 6·28 MJ per kg DM. The in vitro apparent DM digestibility of Atriplex was approximately 0·09 higher than the in vivo apparent digestibility.

The mean nitrogen concentration of the Atriplex DM was 16·6 g/kg, and its apparent digestibility 0·73, which was not improved by the addition of tapioca to the diet. Nitrogen retention of the sheep eating only Atriplex was proportionately 0·17 of the nitrogen intake. The addition of 300 g tapioca improved nitrogen retention to 0·27 but was not significantly different from the other treatments.

Water intake and urine excreted were as high as 14 and 12 I/day respectively, for an Atriplex DM intake of about 1300 g/day. During the experiment the sheep only maintained live weight, despite daily intakes of up to 1200 g Atriplex DM and up to 300 g tapioca.

Keywords

Atriplexdigestibilitynitrogen balancesheep
Type
Research Article
Information
Animal Production , Volume 54 , Issue 2 , April 1992 , pp. 259 - 264
Copyright
Copyright © British Society of Animal Science 1992

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