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Keywords

acid binding capacity, fecal dry matter, fiber, growth performance

Abstract

A total of 360 pigs (initially 13.9 ± 0.58 lb) were used to evaluate the effect of increasing ValoproWin (VLPW) in low acid-binding capacity-4 (ABC-4) diets on nursery performance and fecal dry matter (DM). ValoproWin is a fiber ingredient that contains a purified source of coarse indigestible fiber, oat hulls, and yeast autolysate. At weaning, pigs were randomly assigned within six body weight (BW) blocks to one of the six dietary treatments in a generalized randomized block design. There were five pigs per pen and 12 pens per treatment. Experimental diets were fed for 24 d, and then pigs were fed a common diet for 18 d. The control treatment was a low ABC-4 diet formulated to 200 and 250 meq/kg from d 0 to 10 (phase 1) and d 10 to 24 (phase 2), respectively. ValoproWin was added to the control diet at 1.75, 2.50, 3.75, and 5.00% without making any nutritional adjustments. A positive control, high ABC-4 treatment with pharmacological levels of Zn (3,000 and 2,000 ppm of Zn from ZnO in phases 1 and 2, respectively) was used, yielding ABC-4 values of 487 and 470 meq/kg in phases 1 and 2, respectively. As VLPW increased, BW on d 10 (linear, P = 0.033) and 24 (quadratic, P = 0.049) decreased, with a marginal reduction (quadratic, P = 0.082) in d 42 BW. For the experimental period (d 0 to 24), ADG decreased (quadratic, P = 0.029) as VLPW increased. No response (P > 0.10) to VLPW was observed for ADFI. As a result, feed efficiency worsened (quadratic, P = 0.006) as VLPW increased. The formulation strategy (low vs. high ABC-4 diets) did not affect (P > 0.10) BW or ADG. However, low ABC-4 diets reduced (P = 0.028) ADFI and improved (P = 0.012) feed efficiency during the experimental period. Overall, increasing VLPW tended to decrease (quadratic, P = 0.067) ADG with the lowest ADG at 2.50% VLPW, with performance returning to control levels at 5%. No responses (P > 0.10) were observed for ADFI, with feed efficiency responding (quadratic, P = 0.098) similarly to ADG. No differences (P > 0.10) between low and high ABC-4 diets were observed for any performance criteria. On d 10 and 24, fecal DM increased (linear, P < 0.005) with increasing VLPW. Pigs fed low ABC-4 diets had improved (P = 0.039) fecal DM on d 10; however, no differences were observed on d 24. The amount of manure observed on the body on d 9 decreased (linear, P = 0.011) as VLPW increased; however, no responses (P > 0.10) were observed on d 24. A marginal interaction (P = 0.058) was observed between sampling day and formulation strategy, where on both days, pigs fed high ABC-4 diets were cleaner; however, on d 24, the differences between both formation strategies were greater than d 9. In conclusion, increasing VLPW linearly increased fecal DM on d 10 and 24, and pig cleanliness on d 9, with overall ADG and feed efficiency responding in a quadratic manner. Low ABC-4 diets improved d 10 fecal DM and feed efficiency during the experimental period; however, no differences were observed for overall performance and d 24 fecal DM. High ABC-4 diets reduced the amount of visible manure observed on the body on d 9 and 23.

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