The effects of level of dietary cations on growth, feed efficiency, mineral balance and serum constituents in steers fed ionophores /
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| Other Authors: | , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1990.
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| Subjects: | |
| Online Access: | ProQuest, Abstract Link to OAKTrust copy |
| Abstract: | Three experiments were conducted to determine the effects of level of dietary cations on growth, feed efficiency, mineral balance and serum constituents in steers fed ionophores. Sixty four crossbred steers were used in a 2 x 4 factorial arrangement of treatments, with factors being ionophore (control, monensin, lasalocid, and daily rotation of monensin and lasalocid) and dietary Mg level (.17 and.27% Mg). Steers were weighed every 28 d, fed to a common end weight and slaughtered on either d 84 or 112 of the trial. Magnesium X ionophore interaction for ADG was significant (P <.06) for the period from d 0 to 112. The higher level of Mg increased ADG for lasalocid fed steers, while control, monensin and rotation fed steers had similar ADG across Mg levels. Main effect of ionophore for feed/gain was significant (P <.05) for the period from d 0 to 112. Feed/gain for control or lasalocid fed steers were higher than monensin or rotation fed steers from d 0 to 112. Magnesium level X ionophore interaction (P <.05) was significant for KPH. In Exp. 2, 12 crossbred steers were used in a metabolism study. Steers were adjusted to a 85% concentrate diet for 21 d, then assigned to an ionophore treatment (control, lasalocid, monensin). Within each ionophore treatment, steers were fed four K levels (.5, 1.0, 1.5 and 2.0%) during 4 periods of a 4 x 4 latin square design. Each period consisted of 10 d of adjustment (5 d out and 5 d in metabolism stalls), followed by a 5 d fecal and urine collection. At the end of each collection period, the steers were used in a glucose tolerance study. Steers were infused with 100 mg glucose/kg BW and blood samples taken at 0, 5, 10, 15, 30, 45, 60, 90, 120 and 180 min post-infusion. Ionophores increased (P <.05) absorption and retention of macro-minerals. Ionophore and K levels interacted (P <.05) to affect trace mineral absorption and retention (Zn, Mn, Cu). There was an ionophore X K X time interaction (P <.05) for plasma glucose levels. There was a time effect (quadratic; P <.05) for serum insulin levels. Results from these studies indicate that level of cations in the diet may affect an ionophore's ability to enhance animal performance and metabolism. |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Nutrition." |
| Physical Description: | xi, 115 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |