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University of Illinois, Urbana, IL 61801
Abstract
Forty-eight second, third and fourth parity crossbred sows were randomly allotted to four dietary treatments: corn:alfalfa-orchardgrass hay (46%; CH); CH plus lasalocid (CHL); corn-soybean meal (CS) or CS plus lasalocid (CSL). Sows were fed these diets through two successive gestations with dietary treatment initiated at 35 d post-coitum and continued until parturition. To equalize daily metabolizable energy intake (6.6 Meal/sow), 2.64 kg of CH and CHL diets and 1.86 kg of CS and CSL diets were fed. Lasalocid intake was 130 mg · sow–1 · d–1. Sows were weighed and backfat measurements were taken at 35 and 109 d of gestation. Sows also were weighed 14 d postpartum. A 14% crude protein corn-soybean meal diet was fed ad libitum to all sows during lactation and feed intake was recorded. Colostrum samples were obtained within 4 h of farrowing. All live piglets were weighed at birth and 14 d of age. There were no significant differences among dietary treatments in number of live piglets born, piglet birth weight, piglet weight at 14 d of age or sow rebreeding efficiency. Sows fed CHL and CSL diets had more (P<.12) live piglets at 14 d postpartum and lower (P<.03) total fat in colostrum than did CH- and CS-fed sows. Alfalfa-orchardgrass hay feeding resulted in less (P<.04) backfat deposition during gestation, more (P<.04) weight loss from 109 d postcoitum to 14 d postpartum and increased (P<.002) feed consumption during lactation. These results indicate that the corn:alfalfa-orchardgrass hay (46%) diet was essentially equal to the corn-soybean meal diet with regard to sow reproductive performance. Dietary lasalocid reduced fat percentage of sow colostrum.
1 The authors gratefully acknowledge partial financial support of this work by Hoffman-LaRoche, Inc., Nutley, NJ.
2 Present address: Farmland Industries Inc., Kansas City, KS.
4 Present address: Dept. of Dairy Sci., Univ. of Wisconsin, Madison 53706.
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