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High dietary fiber content may increase endogenous losses of P. If the value for the basal endogenous loss (BEL) of P estimated from the pig fed a P-free diet is affected by the fiber concentration in the diet, the STTD of P may be largely influenced by dietary fiber. The objective of this study was to determine the effects of cellulose concentration in the P-free diets on the basal endogenous loss (BEL) of P in growing pigs. A total of twelve barrows with 49.6±3.2 kg of body weight (BW) were individually allotted in metabolism crates. Pigs were distributed to 4 experimental diets according to a cross-over design with 12 animals and 2 periods. The four P-free diets were based on corn starch, sucrose, and gelatin, and were formulated to contain 0%, 4%, 8%, or 12% cellulose. Each period consisted of a 5-d adaptation followed by 5-d collection period. A total amount of faeces was collected according to a marker-to-marker procedure. Chromium oxide was added at 0.5% to the morning meal as an indigestible marker on d 6 and 11 in each period. Faecal collection was started when the colour of marker begin to appear in the faeces, and ended when the colour appeared again.
The feed intake (p<0.05, linear and quadratic) and dry faeces output (p<0.01, linear and quadratic) were increased with increasing dietary cellulose concentration. However, P concentration in the faeces was decreased (p<0.01, linear and quadratic) with increasing dietary cellulose concentration. There was no significant difference in total P output and the BEL of P as mg per kg DMI (ranging from 157 to 214 mg/kg of dry matter intake) among experimental diets. However, values for the apparent total tract digestibility of energy, dry matter, organic matter, crude protein, and calcium were linearly decreased (p<0.01) with increasing cellulose concentration in the diet.
In conclusion, the ATTD of energy, DM, OM, and other nutrients decreases with increasing dietary microcrystalline cellulose concentration. However, the microcrystalline cellulose did not affect the endogenous loss of P.
Son, A.R. and Kim, B.G. 2015. Effects of Dietary Cellulose on the Basal Endogenous Loss of Phosphorus in Growing Pigs. Asian-Australasian Journal of Animal Science, 28 (3): 369-373. http://dx.doi.org/10.5713/ajas.14.0539