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很早以来就已知不同的蛋白,生物效价也不同。如Kofrany氏等对成年人的研究证明,以卵蛋白的生物效价为100计,酪蛋白的则为72,乳白蛋白的为104。但对婴儿是否也如此,尚不能肯定。不过,Fomon等的研究证明,与高酪蛋白乳相比,高乳白蛋白乳至少有某些优点。[早产儿的蛋白需要] 1940～1970年发表了许多研究报告,表明用高蛋白乳喂养早产儿体重增加较为正常。如Omas等曾报导,每日喂3或8g蛋白/kg/日未见体重增加上有何差异;Snyderman等报导,喂2或9g蛋白/kg/日体重增加无别。但是,Menkes等(1972年)
Different proteins have been known since a long time and have different biological potencies. Studies in adults, such as Kofrany’s, have shown that the biological potency of egg proteins is 100, with 72 for casein and 104 for lactalbumin. But whether this is true for infants is yet to be certain. However, studies by Fomon et al. Demonstrated that high-whey milk has at least some advantages over high-casein milk. [Protein Needed for Premature Infants] A number of studies were published from 1940 to 1970, indicating that weight gain in preterm infants fed high protein milk was normal. As Omas et al. Reported, there was no difference in body weight gain at 3 or 8 g protein / kg / day; Snyderman et al. Reported no increase in body weight at 2 or 9 g protein / kg / day. However, Menkes et al. (1972)