Table 4.

Effect of in ovo feeding of a commercial product containing canthaxanthin at 17.5 d of embryo development on the quality scores¹ (0–100 points) of newly hatched chicks.

Quality score1	Commercial product containing canthaxanthin (mg/0.5 mL/egg)
	0.00	0.35	0.45	0.55	0.65	SEM	P-value
<70.0 points (%)	1.68c	6.58c	6.63c	35.76b	49.00a	12.59	<0.0001
71.0–80.0 points (%)	1.30c	7.55c	9.13b	33.62b,a	39.31a	3.58	<0.0001
81.0–90.0 points (%)	6.00c	33.56a	45.16a	17.48b	4.98c	3.89	<0.0001
91.0–100.0 points (%)	91.01a	53.30b	39.06c	13.37d	6.70d	16.31	<0.0001

^a–dMeans within a row with different superscript letters at different by Kruskal-Wallis test (P < 0.05).

¹Observed items: chick activity, dry feathers, opens eyes, navel, abdominal distention, legs and red hocks. Score adapted from Tona et al. (2003).