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Journal of Animal Science, Vol 74, Issue 6 1217-1222, Copyright © 1996 by American Society of Animal Science

JOURNAL ARTICLE

Effect of supplemental sodium chloride, sodium phosphate, or hydrochloric acid in starter pig diets containing dried whey

D. C. Mahan, E. A. Newton and K. R. Cera
Ohio State University, Columbus 43210-1095, USA.

Three experiments involving a total of 606 pigs weaned at 23 +/- 2 d of age were used to evaluate the effects of added dietary Na or Cl or both in combination (NaCl) on postweaning performance responses. A basal diet without added NaCl was formulated to 1.20% lysine using a corn-soybean protein mixture with 20% dried whey (C-SBP-DW) and was used in all experiments. The analyzed content of the basal diet for the three experiments averaged .19% Na, .37% Cl, and 1.37% K. In Exp. 1, NaCl was added to treatment diets at 0, .20, .40, and .60% at the expense of corn. The experiment was a randomized complete block (RCB) design conducted in 14 replicates using a total of 336 pigs (six pigs/ pen). The results demonstrated a linear (P < .01) growth response during the 0- to 7-d and a quadratic (P < .08) response during the 8- to 14-d period. Gain: feed ratio improved quadratically (P < .08) for the 0- to 14-d period. In Exp. 2, Na2HPO4 added to the C-SBP-DW basal diet provided supplemental Na levels of 0, .08, .16, and .24% Na to four treatment diets. The experiment was conducted in six replicates in a RCB design using a total of 144 pigs (six pigs/pen). The results demonstrated a linear (P < .05) growth response during the 0- to 7-d period as Na level increased, but not thereafter, and an improved gain: feed ratio (P < .05) for the 0- to 14-d period. In Exp. 3, Cl was added as HCl at 0, .05, or .10% Cl to the basal C-SBP-DW diet. The experiment was a RCB design conducted in six replicates using a total of 126 pigs (five or six pigs/pen between replicates). The results demonstrated a linear growth (P < .01) and feed intake (P < .08) response during the 0- to 7-d and the 0- to 14-d period to increasing levels of Cl. Feed intake also increased for the 0- to 7-d (P < .08), and 8- to 14-d (P < .05) periods. Stool looseness was unaffected by any of the dietary variables in the three experiments. These results suggest that the NRC (1988) recommendations for Na and Cl for young pigs (< or = 10 kg BW) may need to be increased.


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M. R. Smiricky-Tjardes, I. Mavromichalis, D. M. Albin, J. E. Wubben, M. Rademacher, and V. M. Gabert
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Copyright © 1996 by the American Society of Animal Science.