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MEKARN Conference 2010 |
A study was conducted in the experimental farm of Cantho University to evaluate the effects of energy supplements of paddy rice (PR) or sweet potato tuber (SPT) in a basal diet of sweet potato vine (SPV) for growing rabbits. Two experiments were of 2*4 factorial designs with three replications and four rabbits per experimental unit. The first factor was supplementary feed: of 0.43 MJ/day/animal (as 45 g/day paddy rice or 115g/day fresh sweet potato tuber); the second factor was the level of SPV (DM basis) offered (5, 6, 7 and 8% of LW). The first trial was done on growing rabbits at 8 weeks of age to evaluate feed intake, growth performance and economic returns, while the second experiment was to measure feed digestibility and nitrogen retention in rabbits of twelve weeks of age.
In experiment 1, the dry matter (DM) and organic matter (OM) intakes were similar between supplements and among the four levels of feed offered (5, 6, 7 and 8% of LW). Crude protein (CP) intake was significantly higher for the paddy rice (P<0.001) and tended to increase (P=0.07) with higher offer levels of SPV. ME intakes were higher (P<0.01) for the PR diet supplement and for the 8% feed offer.. The daily gain and values of carcass were significantly better for the diets with supplement of PR (P<0.01) and 8% feed offered (P<0.01). The lower feed cost which resulted in higher benefit was found for the supplement of SPT and for the level of DM feed offered of 8% of live weight. In experiment 2, the apparent digestibility (%) of DM and OM were significantly higher for the diet with supplemented PR (P<0.01) and in the diet of 8% feed offer level (P<0.001). The nitrogen retention was similar between the two supplements and four levels of feed offered. It was concluded that the diets including PR and offer of SPV of 8% had higher growth performance, however, the SPT supplement gave better economic returns.
Key words: crossbred rabbits, paddy rice, sweet potato tuber, weight gain, nutrient digestibility
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Feed and nutrient intakes, daily weight gain and economic returns of rabbits fed basal diet of sweet potato vine, supplemented with paddy rice (PR) or sweet potato tuber (SPT) |
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Item |
SF SPV, % SE / P |
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|
PR |
SPT |
5% |
6% |
7% |
8% |
SF |
SPV |
|
|
SPV, g DM/day |
43.0 |
43.8 |
42.1 |
42.6 |
43.1 |
45.8 |
0.93/0.54 |
1.31/0.24 |
|
Suppl., g DM/day |
37.7 |
34.6 |
36.3 |
36.0 |
35.8 |
36.5 |
0.18/0.001 |
0.25/0.18 |
|
DM, g/day |
80.6 |
78.2 |
78.3 |
78.5 |
78.7 |
82.1 |
0.89/0.06 |
1.26/0.14 |
|
CP, g/day |
13.2 |
11.7 |
12.1 |
12.2 |
12.4 |
13.0 |
0.17/0.001 |
0.24/0.07 |
|
ME, MJ/day |
0.91 |
0.85 |
0.83a |
0.87ab |
0.90ab |
0.95b |
0.02/0.011 |
0.02/0.009 |
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Final LW, g |
2115 |
2059 |
2028a |
2090ab |
2084ab |
2147b |
17.9/0.042 |
25.3/0.035 |
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Weight gain, g/day |
20.0 |
19.1 |
18.9a |
19.4ab |
19.6ab |
20.3b |
0.18/0.001 |
0.26/0.013 |
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DM Dig, % |
74.9 |
72.1 |
69.5a |
73.3b |
75.2b |
76.0b |
0.88/0.01 |
1.25/0.001 |
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Profit, VND |
15,992 |
18,852 |
15,861 |
18,093 |
17,259 |
18,476 |
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