The effect of synthetic pigment addition to feed on the color of hen egg yolk

摘要

Synthetic pigment Carophyll I, II and III was added to feed with the content of 10.24 MJ/ME, 17.19% protein and-3.62% calcium in a trial on laying hens of Shaver Starcross 288 hybrid at 42 weeks of age. Groups of 15 laying hens received experimental diets for a fortnight, followed by a fortnight interruption and repeated application of experimental diets. Pigmentation intensity increased within 7-10 days, remaining at the same level in the next period: control 6.54 degrees of tile color circle Hoffman La Roche, C-I 8.46. C-II 9.37 and C-III 10.09. After the use of experimental diet was terminated. a great decrease in yolk pigmentation occurred in 5-7 days. Positive effects of Carophyll addition were reflected in the laying intensity of experimental hens that increased by 2.22% in, egg weight higher by 4.7%, egg content production per feeding day higher by 7.49%, and in a decrease in the percentage of nonstandard eggs.