Lönnerdal B, Keen C L, Hurley L S, Fisher G L
Am J Vet Res. 1981 Apr;42(4):662-6.
The concentrations of iron, copper, zinc, manganese, calcium, magnesium, protein, carbohydrate, and fat were analyzed in dog milk during the first 45 days of lactation. The concentration of iron decreased significantly from 13 microgram/ml on day 0 to 6 microgram/ml. Zinc concentration decreased only slightly from 9.6 microgram/ml to 8.7 microgram/ml. Calcium concentration increased significantly during early lactation, from 1,366 microgram/ml to 1,757 microgram/ml on day 10, but changed little thereafter. Protein concentration increased throughout lactation, from 4.3% early in lactation to 6.3% late in lactation. Fat concentration increased from 2.4% to 4.5% in early lactation, and then decreased to 2.7% in late lactation. The concentrations of copper, manganese, magnesium, and carbohydrate did not show strong developmental patterns; average values were 1.8 microgram/ml, 0.14 microgram/ml, 59 microgram/ml, and 4.5%, respectively, throughout lactation. These data indicated that the nutrient intake of the pup changed markedly during the early neonatal period and that these changes should be taken into account in evaluating studies of suckling dogs.
对哺乳期前45天的犬乳中铁、铜、锌、锰、钙、镁、蛋白质、碳水化合物和脂肪的浓度进行了分析。铁的浓度从第0天的13微克/毫升显著降至6微克/毫升。锌的浓度仅从9.6微克/毫升略微降至8.7微克/毫升。钙的浓度在泌乳早期显著增加，从第10天的1366微克/毫升增至1757微克/毫升，但此后变化不大。蛋白质浓度在整个泌乳期都有所增加，从泌乳早期的4.3%增至泌乳后期的6.3%。脂肪浓度在泌乳早期从2.4%增至4.5%，然后在泌乳后期降至2.7%。铜、锰、镁和碳水化合物的浓度没有呈现出明显的变化模式；整个泌乳期的平均值分别为1.8微克/毫升、0.14微克/毫升、59微克/毫升和4.5%。这些数据表明，幼犬在新生儿早期的营养摄入有显著变化，在评估哺乳幼犬的研究中应考虑这些变化。
