The effect of synthetic pigment addition to feed on the color of hen egg yolk
1999
Halaj, M. | Halaj, P. (Slovenska Polnohospodarska Univ., Nitra (Slovak Republic)) | Valasek, F. | Moravcik, F. | Melen, M.
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 the 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.
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