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The effect of exogenous phytase supplementation on nutrient digestibility, ruminal fermentation and phosphorous bioavailability in Rambouillet sheep
Author(s) -
Vallejo Laura Haydee,
Buendía German,
Elghandour Mona MMY,
MenezesBlackburn Daniel,
Greiner Ralf,
Salem Abdelfattah ZM
Publication year - 2018
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.9047
Subject(s) - phytase , propionate , dry matter , neutral detergent fiber , excretion , phosphorus , chemistry , zoology , sorghum , latin square , feces , nutrient , fermentation , biology , food science , agronomy , rumen , biochemistry , paleontology , organic chemistry
BACKGROUND The effect of phytase supplementation with respect to a high sorghum grain diet on sheep voluntary feed intake, apparent nutrient digestibility, ruminal fermentation, phosphorus (P) excretion and blood serum P concentration was evaluated. RESULTS Phytase supplementation significantly decreased fecal P excretion ( P = 0.003), resulting in a 26% decrease in relation to the phytase free diet. Dry matter intake, nutrient digestibility, ruminal butyrate and serum P were not ( P > 0.10) affected by the phytase level. Neutral detergent digestibility showed a tendency to increase linearly ( P = 0.10) with increasing phytase levels. Ruminal pH was lower for phytase supplemented sheep, with a significant decrease ( P = 0.007) at 9 h post feeding, whereas ruminal ammonia‐N at 3 h post feeding was lower ( P = 0.004) for the phytase treatment groups, resulting in a decreasing linear response ( P = 0.001) with an increasing phytase dose. Duodenal pH was significantly reduced at 6 h post feeding. Propionate tended ( P = 0.051) to be increased linearly as the phytase supplementation level increased. CONCLUSION Exogenous phytase supplementation of high sorghum grain diets significantly decreased fecal P excretion in Rambouillet rams. Phytase supplementation appears to affect neutral detergent fiber digestibility, duodenal and ruminal pH, ammonia and propionate. © 2018 Society of Chemical Industry