This experiment was conducted to investigate the effects of dietary emulsifier and L-carnitine on growth performance and serum lipid indices of broilers. A 2×2 factoral completely random design was adopted, and nine hundred and sixty one-day-old Cobb commercial broilers were randomly allotted into 4 treatments with 6 replicates per treatment and 40 birds per replicate. This experiment included three periods: starter (1 to 21 days of age), grower (22 to 49 days of age) and the whole (1 to 49 days of age) periods. The results showed as follows: 1) compared with the control group, dietary emulsifier significantly decreased feed to gain (F/G) during 1 to 21 and 1 to 49 days of age (P<0.01, P<0.05), and significantly increased serum free fatty acid (FFA) content at 21 and 49 days of age (P<0.01); dietary L-carnitine, or L-carnitine+emulsifier significantly decreased F/G in any period (P<0.01, P<0.05), and significantly decreased the contents of triglycerides (TG) and very low density lipoprotein (VLDL) in serum at 21 days of age (P<0.05); dietary L-carnitine significantly increased serum FFA content at 49 days of age (P<0.05); 2) main effect analysis showed that dietary emulsifier significantly increased the contents of total bile acid (TBA) and FFA in serum (P<0.05); dietary L-carnitine significantly decreased F/G in any period (P<0.01), increased the rate of breast muscles (P<0.01), decreased the contents of TG and VLDL in serum at 21 and 49 days of age (P<0.05), and decreased the contents of total cholesterol (TC) and FFA in serum at 21 days of age (P<0.05). The interaction between emulsifier and L-carnitine significantly affected F/G during the starter and the whole periods and serum FFA content at 21 and 49 days of age (P<0.01, P<0.05). In conclusion, the addition of emulsifier, L-carnitine and emulsifier+L-carnitine can improve feed utilization rate, increase the rate of breast muscle, and decrease the contents of TG and VLDL in serum. The addition of emulsifier or L-carnitine can both increase serum FFA content, and emulsifier+L-carnitine can decrease serum FFA content. Supplemental emulsifier or L-carnitine in the diet is better than emulsifier+L-carnitine under high temperature (30 to 35 ℃).
ZHE Li
,
ZENG Qiufeng
,
DING Xuemei
,
HU Ling
,
ZHANG Keying
. Effects of Dietary Emulsifier and L-carnitine on Growth Performance and Serum Lipid Indices of Broilers[J]. Chinese Journal of Animal Nutrition, 2012
, 24(9)
: 1754
-1763
.
DOI: 10.3969/j.issn.1006-267x.2012.09.019
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