Abstract:

In this work, we investigated the physico-chemical properties and chemical composition of donkey colostrums during different lactation periods. The results indicated that the relative density, refractive index, conductivity and acidity of donkey colostrums were all higher than those of common milk; whereas, pH was lower than that of common milk. The contents of protein, ash and fat in donkey colostrums exhibited a decrease trend with the extension of lactation period. The content of lactose was the lowest at 6 h post partum and then the lactose content exhibited a gradual increase with increasing lactation period. In addition, the content of IgG in donkey colostrums was determined by a high-performance affinity chromatography (HPAC) to reveal a decrease trend due to the prolonged lactation period.

Key words: donkey colostrums, physico-chemical property, dynamic change, IgG, HPLC