Agricultural University, BG - 4000 Plovdiv, Bulgaria
NIKOLOVA, M., 2005. Study on the embryonic development of muscovy duck (Carina moshkata) Bulg. J. Agric. Sci., 11: 217-225
The embryonic development of Muscovy duck species was studied from the first until the 30th day inclusive (the transfer of the eggs for hatching). The pear-like shape of the blastodisc was noticeable during the second day. On the second day blood islands as the beginning of vascular system appeared, and, on the fourth day the vascular zone of the yolk circulation was formed. The heart is visible in the third day and the body started turning onto its left side. On the fifth day of incubation, the amnion was noticeable and the amnion liquid was formed. On the eighth day of the embryonic development, the allantois could be distinguished. For that species its normal closure at the sharp end of the egg usually took place about the 14th _ 15th day, while during the interval of the 8th - 14th day only quantitative growth of the embryos was reported. For the first time the beginning of feathering in the lumbo-sacral area was observed in the 14-day embryos. After the 25th - 26th day the amount of the amnion and allantois liquid and of the protein decreased. After the 29th - 30th day after the beginning of incubation the residual yolk sac started drawing into the body cavity and after the 31st - 32nd day the embryos were practically ready for hatching.
The mean daily growth of the embryos for the whole studied period (6th - 33th day of the embryonic development) was 1.37 g and the body length increased by 0.5 cm daily.