J. Anim Sci.
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J. Anim Sci. 1985. 60:1247-1259.
© 1985 American Society of Animal Science
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Effects of Dietary Alfalfa:Orchardgrass Hay and Lasalocid on Nutrient Utilization by Gravid Sows

D. P. Holzgraefe1, G. C. Fahey, Jr.2, A. H. Jensen2 and L. L. Berger2,3,

University of Illinois, Urbana 61801

Abstract

Twenty-four third- and fourth-parity crossbred gravid sows were housed in metabolism stalls and 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). Daily feed intake was 2.36 kg for CH- and CHL-fed sows and 1.66 kg for CS- and CSL-fed sows. Lasalocid intake was 110 mg·sow–1·d–1. Total feces and urine were collected during two 5-d collection periods, 40 and 80 d postcoitum. Digestible energy (DE), metabolizable energy (ME), nitrogen (N) retention, dry matter (DM), neutral detergent fiber (NDF) and acid detergent fiber (ADF) digestibilities, and retention of calcium (Ca), total phosphorus (P), magnesium (Mg), sodium (Na) and potassium (K) were determined. Percentage DE and ME were greater (P<.0001) for CS- and CSL-fed sows (88.3 and 83.4%) than for CH- and CHL-fed sows (65.2 and 61.3%). Lasalocid did not influence (P>.05) DE and ME values but decreased (P<.01) the ME:DE ratio. Percentage N digestibility was greater (P<.0001) for CS- and CSL-fed sows (85.7%) than for CH- and CHL-fed sows (60.8%), but there was no significant difference in N retention, expressed as a percentage of N intake. Lasalocid increased (P<.03) percentage N digestibility; however, the diet x additive interaction decreased (P<.005) grams N retained·sow-1·d-1 for CSL-fed sows. The CH- and CHL-fed sows digested more grams of DM, NDF and ADF but had lower percentage digestibilities of DM and fiber fractions than did CS- and CSL-fed sows. The diet x additive interaction decreased (P<.05) percentages of Ca, P and K digested and decreased (P<.05) grams mineral retained (Ca, P, Mg and K) and mineral retained expressed as a percentage of intake for CSL-fed sows. Results indicate that alfalfa:orchardgrass hay and lasalocid influenced energy, fiber, nitrogen and mineral utilization by gravid sows.

Footnotes

1 Present address: Farmland Industries, Kansas City, KS.

2 Dept. of Anim. Sci.

3 The authors gratefully acknowledge partial financial support of this research by Hoffman-LaRoche, Inc., Nutley, NJ.






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Copyright © 1985 by the American Society of Animal Science.