This experiment was conducted to study the effects of different ratios of feed to water of wet mash on feed intake, nutrient digestibility, nitrogen metabolism and body weight of growing silver foxes. Thirty 12-week-old healthy silver foxes with the average body weight of (3.44±0.19) kg were randomly assigned into 3 groups, and each group had 10 foxes (half male and half female). The silver foxes in the three groups were fed experimental diets with wet mash of ratios of feed to water of 1.0:2.5 (group Ⅰ), 1.0:3.5 (group Ⅱ) and 1.0:4.5 (group Ⅲ), respectively. The experiment lasted for 48 days. The results showed as follows: 1) with the water ratio in wet mash increasing, the dry matter average daily feed intakes at different weeks old were increased by different degrees. Among them, the dry matter average daily feed intakes at 14, 15, 17, 18 and 19 weeks old in group Ⅲ were extremely significantly higher than those in groups Ⅰ and Ⅱ (P<0.01), and the dry matter average daily feed intake at 16 weeks old in group Ⅲ was significantly higher than that in group Ⅰ(P<0.05). The dry matter total feed intake in group Ⅲ was extremely significantly higher than that in groupsⅠ and Ⅱ (P<0.01), and the dry matter total feed intake in group Ⅱ was higher than that in group Ⅰ, but the difference was not significant (P>0.05). 2) The dry matter digestibility in group Ⅰ was significantly higher than that in group Ⅲ (P<0.05). The protein digestibility in group Ⅰ was 4.62% higher than that in group Ⅱ, and that in group Ⅱ was 5.42% higher than that in group Ⅲ, but the differences were not significant (P>0.05). Compared with the group Ⅲ, the fat digestibility in group Ⅰ was 4.03% higher and that in groupⅡ was 4.46% higher, but the differences were not significant (P>0.05). 3)Nitrogen intake in group Ⅲ was extremely significantly higher than that in groups Ⅰ and Ⅱ (P<0.01), and that in group Ⅱ was higher than that in group Ⅰ, but the difference was not significant (P>0.05). With the water ratio in wet mash increasing, the amount of urine was extremely significantly or significantly increased (P<0.05 or P<0.01). The fecal nitrogen output in group Ⅲ was significantly higher than that in groups Ⅰ and Ⅱ (P<0.05), and that in group Ⅱ was higher than that in group Ⅰ, but the difference was not significant (P>0.05). The urine nitrogen output, nitrogen retention and net protein utilization were not significantly different among all groups (P>0.05), but the urine nitrogen output had an increasing trend and the net protein utilization had a decreasing trend with the water ratio in wet mash increasing. The biological value of protein in group Ⅰ was significantly higher than that in groups Ⅱ and Ⅲ (P<0.05). 4) The average body weight of different weeks old, the average daily gain of each stage and the total weight gain were not significantly different among all groups (P>0.05). The feed to gain in groups Ⅱ was 4.30% lower than that in group Ⅲ, and that in group Ⅰwas 1.21% lower than that in group Ⅱ, but there were no significant differences among all groups(P>0.05). Considering all indices, the appropriate ratios of feed to water of wet mash is 1.0:2.5, for growing silver foxes in terms of reducing feed expenses and environmental pollution, and maintaining body weight.
WANG Zhuo
,
SUN Weili
,
ZHONG Wei
,
XU Chao
,
ZHAO Jingbo
,
LIU Fenghua
,
ZHANG Ting
,
LI Guangyu
. Effects of Different Ratios of Feed to Water of Wet Mash on Feed Intake, Nutrient Digestibility, Nitrogen Metabolism and Body Weight of Growing Silver Foxes[J]. Chinese Journal of Animal Nutrition, 2016
, 28(1)
: 288
-295
.
DOI: 10.3969/j.issn.1006-267x.2016.01.037
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