This experiment was conducted to study the effects of dietary Bacillus subtilis and complex enzyme preparation on growth performance, nutrient apparent digestibilities, slaughter performance, immune organ indexes and fur quality of Rex rabbits. A single factor design was adopted, a total of 126 healthy 42-day-old Rex rabbits with similar body weight were randomly divided into 3 groups with 42 replicates per group and 1 rabbit per replicate. Rabbits in the control group were fed a basal diet+300 mg/kg aureomycin, rabbits in the experimental group Ⅰ were fed a basal diet+200 mg/kg Bacillus subtilis+200 mg/kg complex enzyme preparation, and rabbits in the experimental group Ⅱ were fed a basal diet+400 mg/kg Bacillus subtilis+400 mg/kg complex enzyme preparation. The pre-experimental period lasted for 5 days, and the experimental period lasted for 41 days. The results showed as follows: 1) there were no significant effects on the final weight, average daily feed intake, average daily gain, feed to gain ratio, diarrhea rate and mortality rate of Rex rabbits among all groups (P>0.05), and the diarrhea rate and mortality rate were the lowest in experimental group Ⅰ. 2) The crude fiber apparent digestibility of Rex rabbits of control group was significantly higher than that of experimental group Ⅱ (P<0.01), and the calcium apparent digestibility of Rex rabbits of control group and experimental group Ⅱ was significantly higher than that of experimental group Ⅰ (P<0.01). There were no significant effects on the apparent digestibilities of dry matter, crude protein, crude ash, phosphorus, neutral detergent fiber and acid detergent fiber of Rex rabbits among all groups (P>0.05). 3) There were no significant effects on the live weight before slaughter, carcass weight, semi-eviscerated ratio and eviscerated ratio of Rex rabbits among all groups (P>0.05). 4) There were no significant effects on the thymus index, spleen index and sacculus rotundus index of Rex rabbits among all groups (P>0.05). 5) The hair density in buttocks of Rex rabbits of control group and experimental group Ⅰ was significantly higher than that of experimental group Ⅱ (P<0.01), the hair density in shoulder of Rex rabbits of control group and experimental group Ⅰ was significantly higher than that of experimental group Ⅱ (P<0.05); the hair density in belly of Rex rabbits of control group was significantly lower than that of experimental group Ⅰ and experimental group Ⅱ (P<0.01), and experimental group Ⅰ was significantly lower than experimental group Ⅱ (P<0.01). The pelt thickness in buttocks of Rex rabbits of control group was significantly lower than that of experimental group Ⅱ (P<0.01). In conclusion, dietary Bacillus subtilis and complex enzyme preparation have no significant effects on growth performance, slaughter performance and immune organ indexes of Rex rabbits, but have significant effects on apparent digestibilities of crude fiber and calcium and hair density and pelt thickness in buttocks. Considering the above indices, dietary supplemented 200 mg/kg Bacillus subtilis+200 mg/kg complex enzyme preparation for Rex rabbits has better effects.
ZHENG Jianting
,
FENG Guoliang
,
CAO Liang
,
LI Yanping
,
NIU Xiaoyan
,
HUANG Shufang
,
TANG Yaoping
,
REN Keliang
. Effects of Bacillus subtilis and Complex Enzyme Preparation on Growth Performance, Nutrient Apparent Digestibilities, Slaughter Performance, Immune Organ Indexes and Fur Quality of Rex Rabbits[J]. Chinese Journal of Animal Nutrition, 2020
, 32(6)
: 2808
-2815
.
DOI: 10.3969/j.issn.1006-267x.2020.06.041
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