Maximum embryonic growth will occur at approximately 60% moisture. Until the eighteenth day the required relative humidity is 60% and the next day is 70%. You can adjust humidity with giving water into the hatching machine and put into a flat container. 4. 5. I just recently bought these two Ayam Cemani "hens" and a rooster. One of the hens is 4-5 months old and the other hen is a few months younger. The older hen's tail is looking a little rooster-ish. But I'm not familiar enough with this breed, as these are my first Ayam Cemani chickens. You can check the alternative of "Ayam Cemani" the "Kadaknath" Chicken which are much cheaper. The birds are completely black: black plumage with a greenish shine, black legs and toe nails, black beak and tongue, black comb and wattles, black meat and bones and even dark organs. Ayam Cemanis are a striking sight. Covered in black feathers, it radiates a beetle-green plasmatic play of color in sunlight that is absolutely stunning. They are not an overly large fowl; the boys weigh around 4.5-6.5lb, with the hen weighing around 3.5-4.5lb, respectively, so more of a medium-sized bird. Ayam Cemani chickens are suspected to have come from the island of Java and were first described in the history books by Dutch colonial settlers. However, it wasn't until 1998 that Dutch breeder Ayam Cemani, especially the perfect black ones, can have a very high value in Indonesia, because it is believed that they possess mystical powers. The breed was first described in the 1920's, by dutch colonists. Ayam Cemani eggs are cream-colored with a slight pink tint. They are not black, as many people believe. Size: Ayam Cemani eggs are relatively large, compared to the size of the hen. Production: Ayam Cemani hens are not prolific egg layers. They typically lay around 60-100 eggs per year. Taste The Hawkeye State. deren said: I was planning on getting a few ayam cemani because I think they're gorgeous, especially with their solid black combs and wattles. I was figuring on trying to find some hatching eggs, and then learned about svart hona. I live in a place with an alpine winter climate, at about 4500' with wintertime lows regularly qDubI.