This experiment was conducted to study the effects of dietary vitamin E on performance, egg quality, yolk and tissue α-tocopherol contents of breeding hens under cold stress. A total of 288 Hy-Line brown breeding hens, 39 weeks old, were used and divided into six groups randomly with four replicates per group. The basal diet contained 2.375 mg/kg vitamin E. The vitamin E in the form of DL-α-tocopheryl acetate was added to the diets at a level of 0, 20, 50, 80, 160 or 320 mg/kg. Preliminary trial period was 2 weeks and experimental period was 8 weeks. The results showed as follows: compared with 0 mg/kg group, the laying rate was increased when 80, 160 and 320 mg/kg vitamin E were added (P<0.01); the 160 mg/kg group was highest, while the 320 mg/kg group tended to decline(P>0.05). Effect of dietary treatment was not observed in egg quality (P>0.05). The α-tocopherol contents of yolk, liver and heart were increased linearly, and effect of dietary treatment was not observed in kidney. The results suggest that dietary vitamin E can alleviate the performance decrease caused by cold stress in Hy-Line brown breeding hens, meanwhile increase the α-tocopherol content of yolk, liver and heart.
ZHANG Hongxin
,
HUANG Renlu
,
GUO Xiaohu
,
YANG Qiuxia
,
CHEN Hui
. Effects of Vitamin E on Performance, Egg Quality, Yolk and Tissue α-Tocopherol Contents of Breeding Hens under Cold Stress[J]. Chinese Journal of Animal Nutrition, 2012
, (11)
: 2243
-2248
.
DOI: 10.3969/j.issn.1006-267x.2012.11.024
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