An experiment was conducted to determine the effects of different neutral detergent fiber (NDF)/starch ratio diets on performance, caecum fermentation and gastrointestinal development of growing rabbits. A total of 200 35-day-old weanling rabbits were randomly assigned to 4 groups with 50 replicates in each group, and they were fed diets with the ratios of NDF/starch were 2.3 (NDF, 336 g/kg DM; starch, 145 g/kg DM; group Ⅰ), 1.9 (NDF,306 g/kg DM; starch, 164 g/kg DM; group Ⅱ), 1.4 (NDF, 273 g/kg DM; starch, 192 g/kg DM; group Ⅲ) and 1.0 (NDF, 250 g/kg DM; starch, 250 g/kg DM; group Ⅳ), respectively. The trial lasted for 7 days for adaptation, and 40 days for experiment. The results showed as follows: the ratio of NDF/starch had significant influences on average daily gain (ADG) and feed/gain (F/G) (P<0.05), but had no significant influence on average daily feed intake (ADFI) (P>0.05). With the NDF level decreasing and starch level increasing, the ADG was firstly increased and then decreased, while the F/G had an opposite change, and the largest ADG (23.59 g/d) and the lowest F/G (2.93) were found in group Ⅱ. Average diarrhea day of trial rabbits was significantly decreased with the NDF level increasing (P<0.01). The values of stomach weight (SW), small intestine weight (SIW), caecum weight (CW) and small intestine length (SIL) in group Ⅱ were all the largest (longest) among all groups, and the ratio of NDF/starch had a significant influences on SW and SIW (P<0.05). The ratio of NDF/starch had a significant influence on propionic acid content in cecal digesta (P<0.05), but had no significant influence on pH, ammonia nitrogen concentration, acetic acid content, butyric acid content and acetic acid/(propionic acid+butyric acid) in cecal digesta (P>0.05). The propionic acid content in cecal digesta in groups Ⅱ and Ⅲ was significantly higher than that in groups Ⅰ and Ⅳ (P<0.05). The ratio of NDF/starch had significant influence on duodenum villous height (P<0.01), but had no significant influence on duodenum and villous height/crypt depth (P>0.05). And duodenum villous height was the longest in groupⅡ (851 μm), which was significantly higher than that in other groups (P<0.01). Based on a comprehensive consideration of measured indices, the appropriate NDF level, starch level and NDF/starch ratio in the diet of growing rabbits are 305.7 g/kg DM, 163.8 g/kg DM and 1.9, respectively.
ZHU Yanli
,
LI Fuchang
,
WANG Chunyang
,
WANG Xuepeng
. Effects of Different Neutral Detergent Fiber/Starch Ratio Diets on Performance, Caecum Fermentation and Gastrointestinal Development of Growing Rabbits[J]. Chinese Journal of Animal Nutrition, 2013
, 25(8)
: 1791
-1798
.
DOI: 10.3969/j.issn.1006-267x.2013.08.014
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