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The hypothesis that exogenous xylanase added to diets for gestating and lactating sows will increase the apparent total tract digestibility (ATTD) of gross energy (GE) and total dietary fiber (TDF), and digestible energy (DE) and metabolizable energy (ME) was tested. Two diets for gestating and two diets for lactating sows containing corn, soybean meal, distillers dried grains with solubles, wheat middlings, and soybean hulls were formulated without or with 16,000 BXU per kg of exogenous xylanase (Econase XT; AB Vista, Marlborough, UK). Lactation diets contained an indigestible marker. Diets were fed to gestating and lactating sows in two reproductive cycles. A total of 106 gilts and sows were randomly allotted to the two gestation diets 7 d after breeding in a randomized complete block design with 4 blocks. On d 30 post-breeding, 8 non-pregnant animals were removed. From the remaining 98 animals, 48 sows (24 replicates per treatment, 12 sows per block) were placed in metabolism crates on d 35 (midgestation) for 10 d with feces and urine collected for 5 d. The same 48 sows were placed in metabolism crates again on d 95 (late-gestation). All sows were moved to the lactation unit on d 106 and lactation diet feeding was initiated. Fecal samples were collected (grab-sampling) for 5 d starting on d 10 post-farrowing. Sows were weaned on d 20 and 63 sows were rebred. Of these sows, 46 sows were placed in metabolism crates on d 35 and 95 as in the first cycle, and treatments in the farrowing unit were also as in the first cycle. Data were analyzed using the MIXED procedure of SAS with sow as the experimental unit, diet as fixed effect, and block and replicate as random effects. Results indicated that in the first cycle, the ME in mid-gestation, and the ATTD of TDF, and DE and ME in late-gestation were greater (P < 0.05) in sows fed the xylanase-diet compared with the control diet (Table 1). During the first lactation period, sows fed the xylanase-diet had greater (P < 0.05) ATTD of TDF and GE and greater (P < 0.05) DE than sows fed the control diet. During the second gestation period, sows fed the xylanase-diet had greater (P < 0.05) DE and ME in mid- and late-gestation, but no differences were observed in ATTD of TDF (Table 2). During the second lactation period, sows fed the xylanase-diet had greater (P < 0.05) ATTD of TDF and GE and greater (P < 0.05) DE than sows fed the control diet. In conclusion, DE was greater in the xylanase-diet than the control diets during two reproductive cycles, and sows fed lactation diets with xylanase had greater digestibility of fiber. [ABSTRACT FROM AUTHOR]

The hypothesis that the nutritional value of corn protein (approximately 50% protein) is greater than in two sources of distillers dried grains with solubles (DDGS1 and DDGS2) was tested. In Exp. 1, eight ileal-cannulated barrows (37.1 ± 2.4 kg) were allotted to a Latin square and fed a N-free diet or diets based on corn protein, DDGS1, or DDGS2. Data were analyzed by ANOVA using SAS with treatment and replicate being fixed and random effects, respectively. Concentrations of standardized ileal digestible (SID) AA were greater (P < 0.05) in corn protein than in DDGS (Table 1). In Exp. 2, 32 barrows (16.5 ± 0.9 kg) in metabolism crates received diets based on, corn, corn protein, DDGS1, or DDGS2. Data were analyzed as in Exp. 1. Corn protein had greater (P < 0.01) ME compared with DDGS1 and DDGS2 (Table 1). In Exp. 3, 160 pigs (6.02 ± 0.84 kg) were allotted to 4 treatments with 8 pens per treatment. Phase 1 and 2 diets contained 0, 5, 5, or 10% and 0, 2.5, 7.5, or 10% corn protein, respectively, which replaced enzyme-treated soybean meal (HP300) or plasma in phase 1 or HP300 in phase 2. Diets were formulated using ME and SID AA values from Exp. 1 and 2. A common phase 3 diet was used. Data were analyzed as in Exp. 1. At the end of phase 1, BW was reduced (P < 0.05) for pigs fed the diet with the greatest inclusion of corn protein, but there was no difference at the end of the experiment (Table 2). Fecal score tended (P = 0.066) to be reduced in phase 2 for pigs fed the greatest inclusion of corn protein. In conclusion, corn protein has greater ME and digestible AA than DDGS and may reduce fecal scores of pigs. [ABSTRACT FROM AUTHOR]

The objective of this experiment was to test if standardized ileal digestibility (SID) of AA in a new source of high-protein distillers dried grains with solubles (HP-DDGS) is greater than in conventional distillers dried grains with solubles (DDGS-CV). Nine barrows (initial BW: 67.2 ± 6.4 kg) with a T-cannula in the distal ileum were allotted to a triplicate 3 × 3 Latin Square design with 3 diets and 3 periods. Two diets included HP-DDGS or DDGS-CV as the sole source of CP and AA. A nitrogen-free diet was used to determine basal endogenous losses of CP and AA. The statistical model included ingredient as fixed effect and square, period, and animal as random effects. Results indicated that that HP-DDGS contained more CP and AA compared with DDGS-CV (Table 1). The SID of all AA in HP-DDGS were greater (P < 0.001) compared with DDGS-CV with the exception that the SID of Pro was not different between the 2 sources of DDGS. The greater concentrations of AA and values for SID of AA in HP-DDGS indicate that this new DDGS source has a very high quality and may be a great source of digestible AA in diets fed to pigs. [ABSTRACT FROM AUTHOR]