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Effects of Energy Intake and Dichlorvos during Gestation on Reproductive Performance of Gilts and Some Chemical Characteristics of the Offspring¹

South Dakota State University, Brookings

Abstract

Altering energy intake of gestating gilts directly affects weight gain during pregnancy (Clawson et al., 1963; Lodge, Elsley and MacPherson, 1966b; O'Grady, 1967; Baker et al., 1969). However, energy intake had no effect on the number of live or stillborn pigs farrowed. In contrast, other work has shown that increasing energy intake during pregnancy can increase the number of pigs born as well as the number of pigs born alive (Frobish, 1968). Vermedahle et al. (1969) reported that increased energy intake during gestation increased daily gain of the gilt and total number of pigs farrowed, but had no effect on the number of pigs born alive.

Inconsistent results have been reported as to the effect of energy intake by the gravid gilt on pig birth weight. Some workers agree that increasing energy intake increases birth weight (Clawson et al., 1963; Lodge, Elsley and McPherson, 1966a; Vermedahl et al., 1969; Baker et al., 1969), while others have reported that there is no difference (Frobish, Speer and Hays, 1966; Meade et al., 1966).

¹ Published with approval of the Director of the South Dakota State Agricultural Experiment Station as publication No. 950 of the Journal Series.

² Department of Animal Science.

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