Etude de la valeur alimentaire des pailles de céréales traitées ou non à la soude. IV. - Influence du nombre de distributions de l'aliment concentré et de l'addition de bicarbonate de sodium

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Abstract
The feeding value of untreated or NaOH treated straw decreases when the proportion of concentrates in the diet, particularly cereals, increases. To limit this reduction, 3 techniques were used separately, then together: restriction of straw supply; increase in the number of concentrate meals and addition of NaHCO3 (20 g/animal per day). A straw before and after treatment was given to sheep together with 45% concentrates. The increased concentrate feeding only allowed a slight but significant (+ 4.7%) improvement in voluntary straw intake. Feed restriction led to a very marked improvement in treated straw digestibility. Increased concentrate feeding slightly modified the digestibility of the diets (+ 1.5 point) but not significantly. Addition of NaHCO3 had no significant effect on diet digestibilities. Rumen juice characteristics (pH, VFA [volatile fatty acid] and NH3) for the different diets were measured. The poor digestion of straw given together with a large proportion of starch was only partly prevented by reducing the straw supply. Results are discussed.

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