This experiment was conducted to study the effects of expanded cottonseed meal on performance, egg quality and serum biochemical indices of laying hens. Three hundred and sixty Hy-Line laying hens, 40 weeks old, were randomly divided into 5 groups with 4 replicates per group and 18 hens per replicate. The control group was fed a corn-soybean meal basal diet, trial group 1 was used 6% cottonseed meal instead of soybean meal of the control group diet, and trial groups 2, 3, 4 were used 6%, 8% and 10% expanded cottonseed meal instead of soybean meal, respectively. The experiment lasted for 8 weeks. The results showed as follows: 1) different dietary expanded cottonseed had no significant effect on the performance of laying hens (P＞0.05). Compared with the control group, laying rate and average egg weight in trial group 1 were significantly decreased (P<0.05), and feed-egg ratio was significantly increased (P<0.05). 2) Dietary cottonseed meal had significant influence on yolk color (P<0.05), but the shell strength and shell thickness were no significantly affected (P>0.05). Albumen height in trial groups 1 and 4 was significantly decreased than that in control group (P<0.05). 3) The contents of total protein (TP) and potassium (K) in trial group 1 were significantly lower than those in control group (P<0.05), but the glutamic pyruvic transaminase (GPT) activity was significantly higher than that in control group (P<0.05), the uric acid (UA) content was significantly higher than that in trial group 2 (P<0.05). The serum calcium (Ca) content in trial group 4 was significantly lower than that in control group (P<0.05). The contents of TP, Ca and K were decreased with the dietary expanded cottonseed meal levels increasing, but GPT activity was increased, which showed a dose effect. But dietary cottonseed had no significant influence on albumin (ALB) content (P>0.05). In conclusion, diets with 8% expanded cottonseed meal have no negative effect on performance, egg quality and serum biochemical indices of laying hens. Expanding treatment can decrease the harm of free gossypol to laying hens, which can improve the efficiency of cottonseed meal utilization by laying hens.
ZHANG Aiting
,
ZHU Qiaoming
,
GU Linying
,
XIE Peng
,
ZHU Sha
,
DAI La
,
ZOU Xiaoting
. Expanded Cottonseed Meal Affects Performance, Egg Quality and Serum Biochemical Indices of Laying Hens[J]. Chinese Journal of Animal Nutrition, 2012
, 24(6)
: 1143
-1149
.
DOI: 10.3969/j.issn.1006-267x.2012.06.022
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