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Abstract

ABSTRACT


The increase in bio-ethanol industry has created a need for alternative to
corn for ruminants. In the other side there is increase in availability of glycerol,
a primary co-product material of biodiesel production. The objective of this
study was to investigate the effect of partial replacing of corn with glycerol
in diets fed to lactating goats. Twelve lactating Nubian goats were fed a base
diet T1, diets containing 9 glycerol on DM basis T2
and diet containing 9 glycerol plus commercial enzymes 4 g kg-1
DM on DM basis T3 for 84 days. The experimental diets T2
and T3 decreased butyric acids concentration and acetatepropionate
ratio in rumen liquor in relation to T1, the concentration of propionic
acid was increased in T2 and T3 compared with T1.
Replacing corn by glycerol T2 decreased apparent nutrients digestion
coefficients Dry Matter DM, Organic Matter OM, Crud Protein CP, Neutral
Detergent Fiber NDF and Acid Detergent Fiber ADF comparing with other treatments
T1 and T3. Milk production was 1581, 1174 and 161077.6
g h-1 day-1 and FCM was 1774, 1030 and 1648115.9
g h-1 day-1 for T1, T2 and T3,
respectively, Milk composition was not altered by glycerol feeding plus fibrinolytic
enzymes T3 except that milk total protein was decreased from 4.6
24 to 3.5. While, replacing corn by glycerol T2 decreased values
of milk composition compared with control diets T1. The results
indicated that glycerol is a suitable replacement for corn grain with adding
fibrinolytic enzymes in diets for lactating goats and that it may be included
in rations to a level of at least 9 of dry matter without adverse effects on
milk yield or milk composition.

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