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- W2063517677 abstract "Abstract A study was conducted to elucidate the mechanism through which partially delactosed whey and minerals (NaHCO 3 plus MgO) increase milk fat synthesis on restricted-roughage rations and to determine the minimum effective level of the whey. Thirty-six Holstein cows were fed concentrate ad libitum and 2.3kg hay/day for eight weeks. Concentrates contained varying levels of whey (0, 3, 7, and 14%), or minerals (2.5% NaHCO 3 and 1% MgO), or both whey (14%) and minerals. Fat depression was least on the mineral rations, but concentrate intake and milk yields were also lowest. As whey in concentrate increased, milk fat also increased, with 14% whey almost as effective as minerals. Compared to controls, rumen pH was increased by minerals but not by whey. Both minerals and whey decreased rumen propionate and increased acetate; whereas, butyrate was increased only at 14% whey. Increased mammary uptake of fatty acids from heparin-precipitable lipoprotein was directly proportional to arterial concentrations and accounted for almost all of the increased milk fat synthesis on the mineral rations, but for about one-half the increase on whey. A larger uptake of β -hydroxybutyric acid was shown for the 14% whey than for other rations and was related to higher concentrations of the shorter chain fatty acids (C 6 to C 14 ) in milk. Concentrations of stearate and oleate in milk were increased by minerals and by whey; whereas, linoleate was decreased by additives. Stimulation of milk fat synthesis by whey and minerals mediated through increased mammary uptake of fatty acids from serum lipoprotein was not a metabolic reversion to conditions found on a normal ration sufficient in forage." @default.
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- W2063517677 date "1969-01-01" @default.
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- W2063517677 title "Milk Fat Synthesis on Restricted-Roughage Rations Containing Whey, Sodium Bicarbonate, and Magnesium Oxide" @default.
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- W2063517677 doi "https://doi.org/10.3168/jds.s0022-0302(69)86500-8" @default.
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