The objective of this experiment was to investigate the effect of dietary supplementation
of crude glycerol or tallow on intestinal transit time and apparent total tract digestibility
(ATTD) of energy and nutrients in diets fed to broiler chickens. A total of 36 three-weekold male broiler chickens (initial BW¼780.5727.0 g) were randomly allotted to 1 of 3
dietary treatments with 6 replicated cages consisting of 2 birds each. A basal diet was
formulated to be adequate in energy and nutrients. Two additional diets were prepared by
mixing 95.0% of the basal diet with 5.0% crude glycerol or 5.0% tallow. Birds were fed the
experimental diets for 10 d, including 5 d of adaptation period and 5 d of collection period.
Chromic oxide (0.3%) and ferric oxide (0.3%) were added to the diets at the start and
conclusion of the collection period, respectively. Intestinal transit time was determined for
each marker as the difference between the time of feeding the diet containing each
marker and the time of the first appearance of each marker in excreta. Results indicated
that intestinal transit time was greater (Po0.01) for birds fed the diet containing 5.0%
tallow than for birds fed the basal diet, but birds fed the diet containing 5.0% crude
glycerol had similar intestinal transit time to birds fed the basal diet. The diet containing
5.0% tallow had greater (Po0.05) ATTD of gross energy (GE), crude protein (CP), and crude
fat than the basal diet. The diet containing 5.0% crude glycerol had greater (Po0.05) ATTD
of dry matter (DM) and GE than the basal diet, but no differences were observed for the
ATTD of CP, crude fat, crude ash, and phosphorus (P) between these 2 diets. In conclusion,
dietary supplementation of crude glycerol has no effects on intestinal transit time of birds
and nutrient utilization in diets. Inclusion of tallow in diets increases intestinal transit
time of birds and improves nutrient utilization of the diet
The objective of this experiment was to investigate the effect of dietary supplementationof crude glycerol or tallow on intestinal transit time and apparent total tract digestibility(ATTD) of energy and nutrients in diets fed to broiler chickens. A total of 36 three-weekold male broiler chickens (initial BW¼780.5727.0 g) were randomly allotted to 1 of 3dietary treatments with 6 replicated cages consisting of 2 birds each. A basal diet wasformulated to be adequate in energy and nutrients. Two additional diets were prepared bymixing 95.0% of the basal diet with 5.0% crude glycerol or 5.0% tallow. Birds were fed theexperimental diets for 10 d, including 5 d of adaptation period and 5 d of collection period.Chromic oxide (0.3%) and ferric oxide (0.3%) were added to the diets at the start andconclusion of the collection period, respectively. Intestinal transit time was determined foreach marker as the difference between the time of feeding the diet containing eachmarker and the time of the first appearance of each marker in excreta. Results indicatedthat intestinal transit time was greater (Po0.01) for birds fed the diet containing 5.0%tallow than for birds fed the basal diet, but birds fed the diet containing 5.0% crudeglycerol had similar intestinal transit time to birds fed the basal diet. The diet containing5.0% tallow had greater (Po0.05) ATTD of gross energy (GE), crude protein (CP), and crudefat than the basal diet. The diet containing 5.0% crude glycerol had greater (Po0.05) ATTD
of dry matter (DM) and GE than the basal diet, but no differences were observed for the
ATTD of CP, crude fat, crude ash, and phosphorus (P) between these 2 diets. In conclusion,
dietary supplementation of crude glycerol has no effects on intestinal transit time of birds
and nutrient utilization in diets. Inclusion of tallow in diets increases intestinal transit
time of birds and improves nutrient utilization of the diet
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