- Volume 18 Issue 6
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Effects of Acute Changes in the Energy and Protein Intake Levels over the Short-term on the Maternal Milk Amino Acid Concentrations in Lactating Mares
- Matsui, A. ;
- Inoue, Y. ;
- Asai, Y.
- Received : 2004.05.19
- Accepted : 2004.12.21
- Published : 2005.06.01
This study was designed to test the effects of changes in energy and protein intake levels on the maternal milk amino acid concentrations over the short-term in lactating mares. Three lactating mares were enrolled for the study 7 weeks after parturition. A low-energy and low-protein diet (LEP) was administered during the first week of the study, followed by administration of a high-energy and high-protein diet (HEP), again for a week (day 1 to day 7), and milk was sampled thrice daily at intervals of 8 h during the study period. The mean amino acid concentrations in the maternal milk, except for those of proline, serine and valine, were significantly higher in the HEP feeding period than during the LEP feeding period (p<0.05). The sum of the concentrations of all the amino acids (TAA) in the maternal milk samples during the HEP and LEP feeding periods was 1,644.9
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