This experiment was conducted to study the effects of dietary methionine (Met) supplemental level on growth performance, immune function and serum biochemical indices of weaner to 3-month-old growing Rex rabbits. Two hundred weaner Rex rabbits were randomly assigned to 5 groups with 40 replicates in each group and each replicate contained 1 rabbit. Rabbits in 5 groups were fed a basal diet supplemented with 0,0.15%,0.30%,0.45% and 0.60% Met,respectively. The trial lasted for 7 days for adaptation, and 53 days for experimental period. The results showed as follows:1) dietary Met supplemental level did not significantly affected average daily intake (P>0.05), but significantly affected average daily gain (P<0.05), the average daily gain in 0.45% Met group was the highest (16.76 g/d), and extremely significantly affected feed to gain (P<0.01), the feed to gain in 0.45% Met group has the minimum value (3.55). 2) Dietary Met supplemental level had no significant influence on nitrogen intake, fecal nitrogen, urinary nitrogen, digestible nitrogen, nitrogen retention, nitrogen apparent digestibility, nitrogen utilization rate and nitrogen biological availability (P>0.05). 3) Dietary Met supplemental level had no significant influence on the contents of IgA, IgM and IgG in serum (P>0.05). 4) Dietary Met supplemental level had no significant influence on the contents of total protein, albumin and triglyceride and alkaline phosphatase activity in serum (P>0.05), but had extremely significant influence on serum urea nitrogen content (P<0.01). The serum urea nitrogen content in the groups supplemented with 0.30%, 0.45% Met was extremely lower than that in the groups supplemented with 0 and 0.15% Met, and the minimum value (5.70 mmol/L) was in 0.45% Met group. In conclusion, considering all indices of this experiment, the appropriate Met supplemental level in diet of weaner to 3-month-old growing Rex rabbit is 0.45% (the actual Met content in diet is 0.68%).
WU Zhenyu
,
LI Fuchang
,
WANG Xuepeng
,
WANG Chunyang
,
MA Mingwen
. Effects of Dietary Methionine Supplemental level on Growth Performance, Immune Function and Serum Biochemical Indices of Weaner to 3-month-old Rex Rabbits[J]. Chinese Journal of Animal Nutrition, 2012
, 24(10)
: 1897
-1902
.
DOI: 10.3969/j.issn.1006-267x.2012.10.008
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