Keywords: 17β-اورتواستولی; CAL; concurrent asynchronous lactation; CSN1; α-casein; CSN2; β-casein; CTI; colostrum trypsin inhibitor; E2; 17β-oestradiol; EGF; epidermal growth factor; ELP; early lactation protein; HC; hydrocortisone; GR; glucocorticoid receptor; I; insulin; INS;