Table 4 Effect of sea buckthorn seed supplementation on egg yolk weight, albumin weight, albumin height and Haugh unit of laying hens

Age (wk)	SBT-0	T1	T2	T3	p-value
Egg yolk weight (g/egg)
36	15.38±0.33	15.92±0.24	16.35±0.21	17.09±0.23	0.42
37	15.59±0.39	16.21±0.35	16.68±0.18	17.32±0.33	0.17
38	15.37±0.32	15.93±0.12	16.66±0.06	16.86±0.33	0.52
39	15.24±0.17	15.95±0.22	16.20±0.28	16.75±0.33	0.33
40	15.50±0.11c	16.15±0.28b	16.73±0.08ab	16.96±0.25a	0.04
Albumin weight (g/egg)
36	38.62±0.78	39.24±0.61	39.45±0.54	39.60±0.54	0.70
37	38.02±0.97	38.71±0.17	39.02±0.76	39.15±0.72	0.69
38	38.29±0.90	39.16±0.14	38.89±0.81	39.55±0.20	0.55
39	38.51±0.44	38.11±0.27	39.25±0.46	39.57±0.15	0.12
40	38.40±0.49	38.44±0.67	38.92±0.73	39.30±0.55	0.71
Albumin height (cm)
36	4.98±0.32	5.16±0.41	5.41±0.31	5.49±0.49	0.78
37	4.84±0.38	5.19±0.65	5.45±0.37	5.58±0.59	0.75
38	4.80±0.27	5.22±0.48	5.25±0.16	5.66±0.70	0.63
39	5.11±0.09	5.26±0.50	5.31±0.51	5.33±0.30	0.97
40	5.06±0.41	5.10±0.42	5.20±0.41	5.35±0.53	0.96
Haugh unit
36	71.96±0.34	72.52±1.31	73.16±1.30	74.28±3.10	0.82
37	73.32±0.23	73.74±0.75	73.75±1.49	74.13±0.43	0.93
38	75.00±1.73	75.19±1.38	75.90±1.67	76.45±1.35	0.90
39	73.85±1.08	73.96±2.16	75.54±1.60	75.63±0.84	0.74
40	75.25±2.01	75.50±1.93	75.75±1.65	76.75±1.25	0.93

Means in the same column with different superscripts are significantly different (p<0.05).
T1–3, buckthorn seeds were supplemented at the rate of 1, 2 and 3 g/kg of feed respectively.