ABSTRAK Penelitian dilakukan untuk mengkaji substitusi konsentrat dengan te�ung daun murbei � substitusi konsentrat dengan te�ung daun murbei �Morus spp.) yang dikombinasikan dengan jerami �adi sebagai �akan sa�i �otong. Penelitian menggunakan 12 ekor sa�i �eranakan ongole �PO) jantan dengan bobot badan 217±10,53 kg. Ransum terdiri atas jerami �adi, te�ung daun murbei dan konsentrat. Penelitian menggunakan rancangan acak lengka� dengan 3 �erlakuan dan 4 kali ulangan, dengan susunan �erlakuan sebagai berikut: P1= 50% jerami �adi + 50% konsentrat; P2= 50% jerami �adi + 25% konsentrat + 25% murbei; P3= 50% jerami + 50% murbei. Hasil �enelitian menunjukkan bahwa �ermentasi �akan dalam rumen sa�i yang menda�at �ermentasi �akan dalam rumen sa�i yang menda�at ransum P2 lebih e�ekti� dibandingkan dengan P1 dan P3. Hal tersebut ditandai dengan konsentrasi VFA total dan ekskresi alantoin yang lebih tinggi �ada P2. Kehadiran senyawa 1�deo�ynojirimycin 1�deo�ynojirimycin �DNJ) daun murbei dalam sistem rumen �ada �erlakuan P2 dan P3 meningkatkan daya cerna �raksi serat ransum berbasis jerami �adi. Daun murbei dalam ransum juga menyumbang isoacids dalam sistem rumen, yang mendukung �erkembangan bakteri selulolitik. Disim�ulkan bahwa daun mur� daun mur� bei ber�otensi digunakan untuk mensubstitusi konsentrat �akan yang digunakan bersama dengan sumber �akan serat se�erti jerami �adi.

The effects of slow-release zinc-urea complexes (ZnU), urea-impregnated zeolite (UZ) and zinc-ureaimpregnated zeolite (ZnUZ) on the performance of yearling Bali bulls were assessed using 20 Bali bulls (145.3 ± 2.5 kg bodyweight (BW)), which were allocated to five treatments and four replications in a completely randomized design. The treatments were: Diets supplemented with no urea (NU) and with urea (U), ZnU, UZ and ZnUZ. The results of the in vivo study revealed that both ZnU and UZ might replace urea effectively by increasing feed intake. Moreover, substituting urea with ZnU, UZ or ZnUZ increased crude protein total tract apparent digestibility whereas ZnU or UZ replacing urea, improved fibre total tract apparent digestibility. Furthermore, inclusion of UZ in the diet improved live weight gain and feed efficiency in Bali bulls above that of the U and NU diets. Thus, the inclusion of ZnUZ in rice straw-based diets showed slow-release urea had positive impacts on feed intake and nutrient digestibility, and increased the efficiency of feed utilization in Bali bulls.Keywords: Apparent digestibility, feed intake, urea-impregnated zeolite, zinc

Mulberry leaves has a great potential as animal feeds because of its high nutrient content, but has deoxynojirimycin (DNJ) active matter. It is potential to inhibit carbohydrate hydrolysis process, come to monosaccharides. The objective of this experiment is to study the inhibiting ability of mulberry leave extract in carbohydrate hydrolysis process. The kinds of carbohydrates were using glucose, maltose, sucrose and starch. This experiment used twenty four of 60 days old male mice (Mus musculus). Diet and water were given ad libitum. Treatment were allocated ina factorial completely randomized design with three replications and two factors containing of completely mulberry leaves extract and variance of carbohydrates.Variable observed were feed consumtion, feed digestibility, body weight gain and blood glucose. The data were analyzed with univariate analysis of variance. The result showed that inclusion of mulberry leaves extract had decrease body weight (P< 0,05) and reduce blood glucose (P< 0,05).

The objectives of this research are to investigate: (1) The effect of shrimp waste levels in experimental diets on feed intake, daily weight gain, and feed convertion (F/G) of white rats; (2) Optimal level of shrimp waste in white rat diets; and (3) The responses of both male and female white rats to shrimp waste levels. 15 male and 15 female white rats were given pellet ration contain shrimp waste for four weeks. The experimental design used in this research is Completely Randomized Design with 2 x 5 factorial arrangement in 3 replications. The A factor was sex (male and female) and the B factor was shrimp waste levels in ration (0% as control. 5%, 10%, 15%, and 20%). The parameters determined are feed intake, weight gain, and feed convertion of white rats. The results indicate that shrimp waste levels in ration was significantly (P<0.05) affect the dry matter intake, whereas the effect on weight gain and feed convertion of white rats was highly significant (P<0.01). Sex was significantly affect weight gain (P<0.05%), however it was not significance (P>0.05%) on dry matter intake and feed convertion of white rats. There were no interaction (P>0.05%) between shrimp waste levels in ration and sex of white rats. The conclusion of this research that shrimp waste levels in ration of white rats increase dry matter intake and daily weight gain. Whereas, it decreased feed convertion. The optimal level of shrimp waste in the diet for daily weight gain was 19.44%, while optimal feed convertion 16.62%. Male daily weight gain was higher than female.

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