Preference for inorganic sources of magnesium and phosphorus in sheep as a function of need
| Autor: | Juan J. Villalba, Mariana Pedernera, Alessandro Mereu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
030309 nutrition & dietetics
chemistry.chemical_element Animal Behavior and Cognition 03 medical and health sciences Eating Animal science Genetics Animals Magnesium Magnesium phosphate 0303 health sciences Sheep Phosphorus 0402 animal and dairy science 04 agricultural and veterinary sciences General Medicine Serum concentration 040201 dairy & animal science Animal Feed Diet chemistry Mg++ increased Animal Science and Zoology Food Science |
| Zdroj: | J Anim Sci |
| Popis: | We determined whether sheep discriminate among different mineral supplements containing P and Mg and if they modify their selection as a function of the basal diet received. Forty lambs were offered four-way choices among inorganic sources of P and Mg: magnesium oxide in its coarse 1) C-MgO and granular 2) MgO forms and magnesium phosphate: 3) Mag33 (33% Mg and 2.7% P), and 4) MGP (25% Mg and 15% P), and two-way choices between MGP and each of the other minerals, and between MgO and C-MgO (baseline). Subsequently, lambs were randomly assigned to four groups (10 lambs/group) and fed rations such that the levels of Mg and P were low (LMg_LP), adequate (NMg_NP), low in Mg and adequate in P (LMg_NP), or adequate in Mg and low in P (NMg_LP). After 29 d, choice tests (post-deficiency) were repeated. During baseline, lambs ate and preferred Mag33 > C-MgO = MGP > MgO (P < 0.05). This pattern remained during post-deficiency tests, but lambs in LMg_LP and LMg_NP increased their preference for MGP and C-MgO, respectively, whereas lambs in NMg_LP increased their preference for C-MgO and MGP relative to baseline (P < 0.05). The serum concentrations of P and Mg increased after preference tests, and preference for MgO and MGP in low-Mg groups increased as the serum concentration of Mg declined (P < 0.05). Thus, lambs discriminated among different minerals and some groups modified their preferences based on the basal diets received, which rectified mineral imbalances. |
| Databáze: | OpenAIRE |
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