A series of experiments involving 375 farrowings over 6 parities with a 2 x 3 factorial arrangement of treatments and conducted in a randomized complete block design evaluated the effects of trace mineral source and levels on sow reproductive performance, mineral transfer to the progeny, and sow mineral content. The first factor evaluated organic and inorganic trace mineral sources and the second factor evaluated dietary mineral levels, with one at NRC recommendations (NRC) and the second at higher levels (Ind.). Two additional treatments evaluated the Ind. level of both sources, but with additional Ca and P (Ind+Ca/P). Feeding sows organic trace minerals resulted in more total and live pigs born and heavier litter birth weights. Sows fed the Ind+Ca/P level tended (P < 0.10) to have fewer pigs born. Neonatal pig mineral contents were not affected by trace mineral source or level. Colostrum and milk Se was greater at all levels of the organic source. Milk Cu and Zn concentrations were lowest at the NRC level. Total body Cu and Mn concentrations were higher (P < 0.05) when pigs nursed sows fed organic trace minerals. Pig body Mn and Zn concentrations were greater at the Ind. and Ind.+Ca/P levels. Sow total and liver Se contents at parities 1, 2, 4, and 6 were greater (P < 0.05) when the organic source and higher levels were fed. Sow total Cu and liver Cu and Zn contents were greater (P < 0.05) at the higher trace mineral levels. Gilts maintained in a non-gravid state until 35 months of age also had lower total body and liver Cu contents when fed organic trace minerals. Gilt total Cu and liver Cu, Mn, and Zn contents were greater at the higher mineral levels. Total body Se contents were greater when gilts were fed the organic source and the Ind. and Ind.+Ca/P levels. Our research indicates that feeding reproducing sows organic trace minerals increased reproductive performance, but not sow mineral status. This suggests other factors were possibly involved in the increased sow productivity. Feeding higher dietary levels of either trace mineral source demonstrated few beneficial effects.
|School:||The Ohio State University|
|School Location:||United States -- Ohio|
|Source:||DAI-B 79/09(E), Dissertation Abstracts International|
|Keywords:||Trace minerals sow organic|
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