This experiment was conducted to study the effects of citric acid on growth performance, nutrient apparent digestibilities, serum antioxidant indexes and meat quality of growth meat rabbits. Three hundred healthy weanling Hyla rabbits at age of 35 days were randomly divided into 5 groups with 60 replicates in each group and 1 rabbit in each replicate. Rabbits in the control group 1 were fed a basal diet, rabbits in the control group 2 were fed the basal diet supplemented with antibiotics (enramycin 20 g/t+chlorotetracycline 300 g/t), rabbits in experimental groups were fed the basal diet supplemented with 0.5% (group Ⅰ), 1.0% (group Ⅱ) and 1.5% (group Ⅲ) citric acid, respectively. There was a pretrial period of 5 days followed by an experimental period of 22 days. The experiment results showed as follows:1) the average daily weight gain in group Ⅰ and control group 2 was significantly higher than that in the control group 1 (P<0.05), and there were no significant difference between the two groups (P>0.05); there was no significant difference in average daily weight gain between groups Ⅱ, Ⅲ and two control groups (P>0.05); the feed/gain in group Ⅰ and control group 2 was significantly lower than that in control group 1 (P<0.05), but there were no significant difference between group Ⅰ and control group 2 (P>0.05), there were no significant difference in feed/gain among all experimental groups (P>0.05); dietary citric acid had no significant effect on average daily feed intake, diarrhea rate and mortality rate (P>0.05); the diarrhea rate in groups Ⅱ and Ⅲ were the lowest, the mortality rate in group Ⅲ and control group 2 were the lowest. 2)Compared with the control group 1, dietary citric acid significantly increased the apparent digestibilities of crude protein and ash (P<0.01), and had no significant difference in the apparent digestibilities of energy, dry matter, neutral detergent fiber and acid detergent fiber (P>0.05). 3) Dietary citric acid had no significant difference in slaughter performance and meat quality indexes (P>0.05). 4)The serum total antioxidant capacity had no significant difference among groups (P>0.05), the serum superoxide dismutase activity in group Ⅲ was significantly higher than that in control groups 1 and 2 (P<0.05), but had no significant difference with groups Ⅰ and Ⅱ (P>0.05). Considering all indices of this experiment, the appropriate citric acid supplemental level in the diet of growth meat rabbits is 1.5%.
ZHENG Jianting
,
FENG Guoliang
,
CAO Liang
,
ZHAN Haijie
,
LI Yanping
,
NIU Xiaoyan
,
TANG Yaoping
,
REN Keliang
. Effects of Citric Acid on Growth Performance, Nutrient Apparent Digestibilities, Serum Antioxidant Indexes and Meat Quality of Growth Meat Rabbits[J]. Chinese Journal of Animal Nutrition, 2020
, 32(5)
: 2282
-2289
.
DOI: 10.3969/j.issn.1006-267x.2020.05.037
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