Prediction of some Tunisian roughages voluntary intake by "Noire de Thibar" ewes
2007
Rouissi, H.; Rekik, B., Ecole Supérieure d'Agriculture de Mateur (Tunisia) | Chermiti, A., Institut National de la Recherche Agronomique (Tunisia) | Hammami, M., Office des Terres Domaniales, Ghèzala-Mateur (Tunisia) | Toukebri, H., Bureau de Contrôle des Unités Coopératives de Production Agricole, Béja (Tunisia)
The present study aims at predicting the voluntary intake of different roughages by ewes. Rations based on Egyptian clover, oat, barley "Souihli", barley "Manel", vetch-oat silage, and vetch-oat hay were distributed ad libitum twice a day during different periods of 4 weeks each to 6 black-thibar ewes. Ewes' regime was enriched by 10 g-Kg LW0.75 of concentrate and by 30 g-animal daily of a commercial mixture of minerals and vitamins. Chemical composition (DM, CP, NDF, and CF) was determined for each roughage. Ruminal degradability of these roughages was determined using the technique of nylon bags. There were significant differences among roughages with regard to immediately soluble fraction "a", insoluble but degradable fraction "b", and fraction rate of degradation "c". The voluntary intake of roughages ranged from 784 g DM to 1104 g DM daily. Average silage intakes were 918 g DM daily. This low value may be related to the quality of roughage conservation. Roughage intake can be predicted based on chemical characteristics. The NDF and the CB contents with ruminal degradability parameters explained 34% of the total variation of roughage intake by Black-Thibar ewes
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