摘要：A research on dietary inclusion of urea-impregnated zeolite as slow-release urea (SRU) agent had been conducted to reveal its effect on ruminal fermentation characteristics in local lambs. The research used 24 heads of 7-8 mo old of local male lambs with (20.12±2.1 kg BW) designed upon a randomized block design. Treatments consisted of diets contained no urea, urea, zeolite, and urea-impregnated zeolite. The collected data was analyzed with UNIANOVA and Duncan’s multiple-range test. Results indicated that feeding no urea, zeolite, or urea-impregnated zeolite ration produced lower ruminal ammonia nitrogen than feeding urea ration (P < 0.05). Feeding zeolite ration produced lower ruminal pH than feeding urea ration (P < 0.05). Despite total VFAs were similar across the treatments, feeding urea-impregnated zeolite ration produced lower ruminal acetate, acetate to propionate ratio, or methane production than feeding urea ration (P < 0.05). Feeding urea ration produced the lowest molar proportion of branch-chained VFAs (P < 0.05). Feeding urea ration produced higher plasma urea concentration than feeding no urea ration (2.75 mM vs. 2.16 mM; P < 0.05). In conclusion, zeolite or urea-impregnated zeolite as slow-release ammonia or SRU agent was potential in decreasing ruminal ammonia, pH, acetate to propionate ratio, methane, and maintaining low plasma urea within its physiological range.
其他摘要：Penelitian zeolit-urea sebagai bahan urea lepas-lamban dalam ransum dilakukan untuk mengungkap pengaruhnya terhadap karakteristik fermentasi rumen pada domba muda. Penelitian menggunakan 24 ekor domba jantan muda umur 7-8 bulan, berbobot 20,12±2,1 kg yang dirancang berdasarkan rancangan acak kelompok. Perlakuan terdiri atas ransum tanpa urea, berurea, berzeolit, dan berzeolit-urea. Data yang berhasil dihimpun, dianalisis dengan sidik ragam dan uji jarak ganda Duncan. Hasil penelitian mengungkapkan pemberian ransum tanpa urea, berzeolit, atau berzeoliturea menghasilkan N-amonia rumen yang lebih rendah daripada pemberian ransum berurea (P<0,05). Pemberian ransum berzeolit memperlihatkan pH rumen lebih rendah daripada pemberian ransum berurea (P<0,05). Meskipun total VFA sama antarperlakuan (P>0,05), namun pemberian ransum berzeolit-urea menghasilkan asetat, nisbah asetat:propionat, dan produksi gas metan rumen domba yang lebih rendah daripada pemberian ransum berurea (P<0,05). Pemberian ransum berurea menghasilkan proporsi molar asam lemak berantai cabang (BCVFA) terendah (P<0,05). Kadar urea plasma domba yang diberi ransum berurea lebih tinggi daripada domba yang diberi ransum tanpa urea (2,75 mM vs. 2,16 mM; P<0,05). Disimpulkan, zeolit atau zeolite-urea sebagai bahan ammonia atau urea lepas-lamban dalam sistem fermentasi rumen mampu menurunkan kadar amonia, nisbah asetat:propionat, produksi gas metan, dan pH rumen, serta mempertahankan kadar urea plasma tetap dalam kisaran fisiologis normal.
