국내산(國內産) 농산부산물(農産副産物) 발효사료(醱酵飼料)를 급여(給與)한 재래산양(在來山羊)의 사료섭취량(飼料攝取量) 및 소화율(消化率) = Feed Intake and Digestibility in Korean Native Goats Fed Fermented Domestic Agricultural By-Products

다국어 초록 (Multilingual Abstract)

In this study, by-products of rice bran, rice hull, bean curd dregs and food waste were fermented with different ratios of 26，26，34 and 14% respectively and the experimental diets were prepared mixing it with various ratios of commercial diets (fermented feed ： commercial feed ； A 80 : 20，B 70 : 30，C 60 : 40，D 50:50). In Experiment I, feed intake, nutrients digestibilities and nitrogen retention were investigated and body weight gain in Experiment Ⅱ.
1. For chemical composition of experimental diets, crude protein contents were 13.73, 13.78，14.45 and 15.14% in A, B，C and D respectively and the contents of crude fat and crude fiber were highest in A as 8.66 and 27.82% respectively.
2. Dry matter intakes were significantly higher (P<0.05) in A(362.06g/d) and C(358.49g/d) than B and D. Intakes of crude protein and crude fat were not significantly different (P〉0,05) among treatments however those of crude fiber and crude ash were significantly higher (P〈0.05) in A(101.47g/d).
3. Dry matter digestibilities in the range of 53.38~68.81% in all treatments have shown the highest value in C of 60% fermented feed plus 40% commercial diet but the lowest in A of 80% of fermented feed plus 20% commercial diet (1<0.05). 59.85% of digestibility of crude protein in A was also lowest among all treatments (P<0.05).
4. 8.47g/d of nitrogen intake in C was recorded highest (P<0.05) however the highest nitrogen retention was marked in D of 50% fermented feed plus 50% of commercial diet due mainly to lower excretion of nitrogen through feces.
5. The data of live weight gain in Experiment n has not been shown as a result since the proper daily gain of body weight was achieved only in D as 88.89g/d and the goats in other treatments have shown frequent diarrhea. However, neglecting the animals with diarrhea, higher amounts of concentrates in the diets (C and D) showed the tendency of higher weight gain.
6. In this study, feeding 60% fermented feed manufactured with domestic agricultural by-products of rice bran, rice hull, bean curd dregs and food waste to Korean native goats have shown satisfactory results of intake and digestibility and it indicates that utilization of domestic agricultural by-products in goats could be improved by the process of fermentation. However it’s effects on body weight gain and nitrogen retention were below than expected. Different sources of feedstuff for fermentation may result in different performances of animals. However, to draw overall conclusion from this study, 50~60% of fermented feed can be recommended in the case of mixing with concentrates.