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Abstract
An experiment was conducted to examine the effect of immunoneutralization against CCK-8 on feed intake of lactating sows. Forty-eight sows were immunized against CCK-8 and received either a corn-soybean meal (C-SBM) or a corn-soybean meal-10% tallow (tallow) diet. Diet had no effect (P = .33) on metabolizable energy (ME) intake. No linear relationships between either feed or ME intake, or litter weight gain, and anti-CCK-8 titer were present (P = .18 to .94). These results indicate that immunization against CCK-8 does not increase sow feed intake or litter performance. Four experiments also were conducted to examine: (1) meal patterns, and (2) plasma concentrations of selected metabolites and hormones in lactating sows fed either a C-SBM or a tallow diet. There were 16, 16, 18, and 8 sows in Exp. 1 through 4, respectively. There was no effect of diet on ME (P = .34 to .94) intake in Exp. 1 through 4. Feed intake was reduced ( P = .09) in sows fed tallow in Exp. 4. Tallow reduced (P = .01) meal size in Exp. 3, but there was no effect (P = .13 to .92) of diet on meal size in Exp 1, 2, or 4. In Exp. 1 through 3, tallow reduced (P = .0001 to .05) the time spent consuming feed and increased (P = .0001 to .08) the rate of feed consumption. There was no effect of diet on the number of meals consumed (P = .29) or the time spent consuming feed (P = .79) in Exp. 4. In Exp. 2, plasma concentrations of glucose were increased (P = .01), while concentrations of non-esterified fatty acids (NEFA; P = .10), and glucagon (P = .02) were decreased in sows fed tallow. There was no effect (P = .17 to .61) of diet on the plasma concentration of metabolites or hormones in Exp. 3. In Exp. 4, the concentration of NEFA was increased (P = .06) in sows fed tallow. The effect of tallow on feeding patterns are consistent with the benefits of dietary fat observed during heat stress. Changes in plasma concentrations of metabolites and hormones were inconsistent regarding both parity and prandial state.
