Milk cholesterol concentration in sows selected for three generations for high or low serum cholesterol.
Kandeh M.M. | Park Y.W. | Pond W.G. | Young L.D.
Female crossbred swine (Chester White X Landrace X Large White X Yorkshire) selected for three generations for low (L, n = 24) or high (H, n = 26) serum cholesterol at 8 wk of age were milked at d 20 or 21 of their first lactation to measure cholesterol, fat, lactose, protein, and ash concentrations. A contemporary, unselected control (C) group from the same original population (third lactation, n = 7) was sampled concurrently. All sows were fed a standard gestation, then lactation, diet that contained no cholesterol or added fat (all plant, corn-soybean meal). Genetic selection for low or high serum cholesterol at 8 wk of age induced corresponding changes in milk cholesterol and fat concentration in the third generation of selection, but not in any other milk constituents. Milk cholesterol concentrations (milligrams/100 grams fresh weight) were L, 25.3 +/- 3.0; C, 35.7 +/- 8.0; and H, 41.4 +/- 6.9 (L < C < H, P <.01). Corresponding values for milk fat were 5.7 +/-1.3, 7.2 +/-.8, and 7.0 +/-.8 mg (L < C = H, P <.01). Serum cholesterol concentrations at 8 wk of age were L, 66.1 +/- 8.1; C, 93.7 +/- 13.7; and H, 126.2 +/- 9.7 mg/dL (P <.01). Milk cholesterol concentration was significantly correlated with serum cholesterol (r =.782, P <.01) and milk fat (r =.36, P <.01). It seems that selecting swine for low or high serum cholesterol at 8 wk of age induced changes in lipid metabolism reflected in differences in milk cholesterol concentrations.
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