The Effect Of Dietary Fiber Levels On The Assessment Of Standard Digestibility Of Amino Acids And Phosphorus In Growing Pigs

This experiment was conducted to study effect of dietary levels of fiber from purified cellulose on the estimation of endogenous phosphorus (P) loss and ileal endogenous losses (IEL) of amino acid (AA). Studied the standardized ileal digestibility (SID) and of P and AA in corn-soybean meal diets for growing pigs. The study was conducted to provide certain scientific basis for fibrous feeds'application in actual production for swine nutrition. The experiment include two parts:The EXP.1, Two experiments were conducted to investigate the effect of dietary levels of fiber from purified cellulose on the estimation of endogenous phosphorus (P) loss, and standardized ileal digestibility (SID) and total tract digestibility (STTD) of P in corn-soybean meal diets for growing pigs. In experiment 1, a total of 28 growing pigs (initial BW,25.1 ± 2.0 kg) were surgically fitted with simple T-cannulas at the distal ileum and assigned to 4 P-free diets containing 4 graded levels of purified cellulose supplementation (0,3%,6% or 9%). According to a completely randomized design. There were 7 replicates in a treatment group with 1 pig per replicate. In experiment 2, a total of 28 T-cannulas pigs were assigned to 4 corn-soybean meal diets with 4 levels of purified cellulose supplementation (0,3%,6% or 9%). According to a completely randomized design. There were 7 replicates in a treatment group with 1 pig per replicate. In each study, the experimental period consisted of a 5 d adjustment period,2 d of feces collection on d 6 and 7, and 2 d of ileal digesta collection on d 8 and 9. Chromic oxide was included in diets to determine basal endogenous P loss (EPL) and apparent digestibility of P. The results showed that the estimates of basal EPL for total tract of pigs decreased with graded levels of dietary fiber from purified cellulose (P<0.05). The apparent ileal digestibility (AID), apparent total tract digestibility (ATTD), SID and STTD of P in diets decreased with increasing fiber levels (P<0.05).The EXP.2,Two experiments were conducted to investigate effects of dietary fiber levels on the determination of ileal endogenous losses (IEL) of amino acid (AA), apparent (AID) and standardized (SID) ileal digestibility of AA in corn-soybean meal diets for growing pigs. (Methods) In experiment 1, twenty-eight pigs (BW,25.1±2.0 kg) fitted with a simple T-cannula at the distal ileum were fed 4 nitrogen-free diets consisted of 4 dietary levels of fiber (0,3,6, or 9%) in a randomized complete block design. In experiment 2, twenty-eight pigs fitted with a simple T-cannula at the distal ileum were fed 4 corn-soybean meal diets consisted of 4 dietary levels of fiber (0,3,6, or 9%) in a randomized complete block design. There were 7 replicates per diet with 1 pig as a replicate in each treatment. Both experiments consisted of a 7-d adjustment period and 2-d of ileal digesta collection period on d 8 and 9. Chromic oxide was used as an indigestible marker to calculate IEL and digestibility of AA. (Results) The results showed that IEL of AA for growing pigs was not influenced by dietary fiber supplementation (P>0.05). The AID of Thr, Ser, Glu, Cys, Ile, Tyr, Phe, Lys, and His decreased with increasing dietary levels of fiber supplementation for pigs fed corn-soybean meal diets (P<0.05). The SID of Thr, Ser, Cys, Val, Ile, Tyr, Phe, Lys, and His decreased with graded levels of fiber in corn-soybean meal diets (P<0.05).In conclusion, under the condition of this experiment. The pig on cellulose Phosphorus Diets the suitable addition level was 3%-6%.corn-soybean meal diet recommendations do not add. dietary fiber levels influence the determination of EPL for growing pigs, and P digestibility in corn-soybean meal diets. dietary fiber levels had no effect on the estimates of IEL of AA for growing pigs. The AID and SID of most AA in corn-soybean meal diets decreased with increasing levels of dietary fiber supplementation.