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161 Preference for inorganic sources of calcium and phosphorus in sheep
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161 Preference for inorganic sources of calcium and phosphorus in sheep
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Journal Article
161 Preference for inorganic sources of calcium and phosphorus in sheep
2019
Overview
We determined whether lambs discriminate among mineral supplements containing P and Ca and if they modify their choices as a function of need. During 3 consecutive days, 40 lambs under a basal diet of alfalfa pellets and barley were offered 4-way choices among= (1) Bolifor® Monosodium phosphate (MSP-24% P), (2) Bolifor® Magnesium phosphate (MGP-15% P, 25% Mg), (3) Bolifor® Monocalcium phosphate (MCP-22.7% P, 16.5% Ca) and (4) Dicalcium phosphate (DCP-18.5%P, 23% Ca), and 2-way choices between DCP and each of the remaining minerals (Baseline). Subsequently, lambs were randomly assigned to four groups (10 lambs/group) and fed beet pulp-based basal rations such that the levels of Ca and P were low (LCa-LP), adequate (NCa-NP), low in Ca and adequate in P (LCa-NP), or adequate in Ca and low in P (NCa-LP). After 60 d, groups had the described 4- and 2-way choices (Post-deficiency). Intake and preference indexes during choice tests were analyzed as a split-plot design with lambs nested within group and day as the repeated measure. During Baseline, lambs ate and preferred MSP > MGP > DCP = MCP (P < 0.0001). This pattern remained during post-deficiency, but in contrast to Baseline, lambs in NCa-LP, LCa-NP, and LCa-LP showed the greatest preferences for MSP (42%), MGP (42%) and MCP (22%), respectively (SEM = 4%; P < 0.05). Groups under LCa in 2-way choices showed greater preference for MCP (56%) than groups under NCa (39%; SEM = 5%; P < 0.05), and lambs in LCa-NP revealed the greatest preference for MGP (64%; SEM = 6%; P < 0.05). Serum P concentration after post-deficiency choice tests (9.7 ± 0.7 mg/dL) returned to Baseline values, but Ca concentration was 0.9 mg/dL lower (9.3 ± 0.3 mg/dL; P < 0.05) than in Baseline. Thus, lambs discriminated among mineral sources and displayed preferences reflecting their needs.
Publisher
Oxford University Press
Subject
