Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Mineral Metabolism in Singleton and Twin-pregnant Dairy Goats

  • Harter, C.J. (Department of Animal Sciences, UNESP, Univ Estadual Paulista) ;
  • Castagnino, D.S. (Department of Animal Sciences, UNESP, Univ Estadual Paulista) ;
  • Rivera, A.R. (Department of Animal Sciences, UNESP, Univ Estadual Paulista) ;
  • Lima, L.D. (Department of Animal Sciences, UNESP, Univ Estadual Paulista) ;
  • Silva, H.G.O. (Department of Animal Sciences, UNESP, Univ Estadual Paulista) ;
  • Mendonca, A.N. (Department of Animal Sciences, UNESP, Univ Estadual Paulista) ;
  • Bonfim, G.F. (Department of Animal Sciences, UNESP, Univ Estadual Paulista) ;
  • Liesegang, A. (Institute of Animal Nutrition, University of Zurich) ;
  • St-Pierre, N. (Department of Animal Sciences, The Ohio State University) ;
  • Teixeira, I.A.M.A. (Department of Animal Sciences, UNESP, Univ Estadual Paulista)
  • Received : 2014.03.25
  • Accepted : 2014.06.24
  • Published : 2015.01.01
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Abstract

During pregnancy, the maternal body undergoes significant physiological changes. The present study assessed the changes on calcium (Ca), phosphorus (P), magnesium (Mg), sodium (Na) and potassium (K) metabolism in singleton and twin-pregnant dairy goats. The 42 goats used ($49.5kg{\pm}7.6$ body weight [BW]) were assigned at random to treatments that were factorially arranged to account for 2 breeds (Oberhasli and Saanen), 2 pregnancy types (singleton and twin) and 3 gestation periods (80, 110, and 140 days). Digestibility trials were performed at 80, 110, and 140 days of gestation. Mineral retention during pregnancy was determined in the maternal body, femur, uterus, mammary gland, fetus and fetal fluid. Blood samples were taken during pregnancy before and after a meal, and Ca, P, Mg, Na, K ions and alkaline phosphatase activity determined in serum. Bone mineral density was determined in the right femur. Statistical analyses were performed using the SAS MIXED procedure. Dry matter intake decreased linearly up to 140 days of gestation. Maternal BW gain, and Ca, P, and Mg retention (g/kg) decreased linearly with the advance of gestation days. Macromineral retention in maternal body (g/kg) was greater in Oberhasli than Saanen goats, and their fetuses had higher Ca, P, and Mg deposition (mg/g). Mineral retention (mg/g) increased in fetuses according to pregnancy development, with no differences between singleton and twin pregnancy. In the mammary gland, the retention of all minerals (g) increased with the days of pregnancy. In conclusion, related to Ca, P, and Mg metabolism can be divided into two stages. Up to 80 days of gestation, was characterized by the preparation of the maternal body reserves for future mineral demands. From 80 days of gestation onward, was characterized by the transfer of maternal body reserves for fetal development and colostrum production. Na and K supply was provided by adjustments in endogenous excretion and an increase in intestinal absorption. Finally, mineral metabolism was specific to each genotype and, except for Na, was not affected by the number of fetuses.

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