The objective of this research was to investigate the influences of generative stage on crude protein, crude fiber, ash, and crude fat contents as well as in-vitro dry matter and organic matter digestibilities of M-10 BMR sorghum mutant lines. This research was arranged into a randomized block design with 2 factors. The first factor was M-10 BMR sorghum mutant lines (

The objective of the study was to explore the appropriate cutting age to produce optimal biomass and good nutrient quality from sorghum mutant lines BMR i.e., PATIR 3.5 M7, PATIR 3.6 M7, and PATIR 3.7 M7, also SAMURAI I (M17). A completely randomized in Split Plot design with 2 factors and 3 replicates was used. The first factor was the type of sorghum (SAMURAI I M17, PATIR 3.5, PATIR 3.6, PATIR 3.7) as the main plot and the second factor was the cutting age (85, 95, 105) as a subplot. Parameters observed were the production of stems, leaves, grains, total biomass production, ash, crude fat, crude fiber, crude protein, NFE, TDN, percentage of DMD, OMD and N-NH 3 . Data were analyzed by using ANOVA followed by DMRT (Duncan Multiple Range Test). The results showed that there were highly significant interactions (P<0.01) between cutting age and type of sorghum in production of stems, leaves, grains, total biomass production, value of TDN, DMD, OMD, and N-NH 3 . Increasing cutting age significantly increased the percentage of ash content, crude protein and crude fat. The sorghum type significantly affected crude fat content nonBMR sorghum variety of SAMURAI I (M17) and achieved optimal biomass production and nutrient content at cutting age of 85 d similar to BMR sorghum mutant lines PATIR 3.6 and PATIR 3.5, whereas BMR sorghum mutant lines of PATIR 3.7 achieved optimum production at the age of 95 d of cutting. All types of sorghum varieties was not recommended to be harvested at 105 d. Biomass production increased with the increasing of cutting age, but the nutrient content decreased. Key words: cutting age, mutant, sorghum ABSTRAKPenelitian ini bertujuan untuk mencari umur pemanenan yang tepat untuk menghasilkan biomassa dan kandungan nutrien yang optimal dari galur sorghum hasil mutasi yang disebut BMR, yaitu PATIR 3.5 M7, PATIR 3.6 M7, dan PATIR 3.7 M7 serta sorghum dari varietas SAMURAI I (M17). Penelitian ini menggunakan rancangan acak lengkap pola petak terbagi dengan 2 faktor dan 3 ulangan. Faktor pertama adalah jenis sorghum (SAMURAI I M17, PATIR 3.5, PATIR 3.6, PATIR 3.7) sebagai petak utama dan faktor kedua adalah umur pemanenan (85, 95, 105) sebagai anak petak. Peubah yang diamati ialah produksi batang, daun, bulir, produksi biomassa total, kadar abu, lemak kasar, BETN, serat kasar, protein kasar, TDN, KCBK, KCBO, serta N-amonia. Data dianalisis dengan ANOVA diikuti dengan uji lanjut DMRT (Duncan Multiple Range Test). Hasil penelitian menunjukkan terdapat interaksi yang sangat nyata (P<0,01) antara umur panen dan jenis sorghum pada produksi batang, daun, bulir, produksi biomassa total, nilai TDN, KCBK, KCBO, dan konsentrasi N-amonia. Umur panen berpengaruh nyata pada persentase kandungan abu, protein kasar dan lemak kasar, ketiganya menurun seiring dengan bertambahnya umur panen. Jenis sorghum berpengaruh nyata pada kandungan lemak kasar. Sorghum nonBMR varietas SAMURAI I (M17), sorghum BMR PATIR 3.6 dan PATIR 3.5 mencapai produksi biomassa optimal dan kandungan nutrisi optimal pada umur panen 85 ...

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The experiment aimed to evaluate the production of nutrients by different varieties of sorghum grown with high valuable indigofera legume in intercropping system and to determine the suitable variety of sorghum that produced the highest nutrient in the system. The experiment was done at Jonggol Animal Science Teaching and Research Unit (UP3J) Jonggol, from November 2014 to March 2015. This experiment was conducted using completely randomized design with 2 factors (3 x 4) and 4 replications. The first factor was sorghum varieties (PATIR 3.2 (S1), PATIR 3.7 (S2), and CTY-33 (S3)). The second factor was indigofera composition (0% indigofera (I0), 30% indigofera (I1), 40% indigofera (I2), and 50% indigofera (I3)). Data were analyzed using analysis of variance and HSD test. There was no interaction among varieties of sorghum and indigofera composition. Indigofera population of up to 50% in multiple cropping system had the highest (P<0.01) dry matter content, crude protein content, ash content, total fresh weight production, total dry weight production, total crude protein production, total ash production, and carrying capacity. Sorghum variety CTY-33 planted in multiple cropping system had the highest (P<0.01) dry matter content, total dry weight production, and (P<0.05) total crude protein production. PATIR 37 sorghum variety planted in multiple cropping system had the highest (P<0.05) ash content and (P<0.01) total ash production. It is concluded that Indigofera population of up to 50% planted with different varieties of sorghum in multiple cropping system had the highest nutrient production.Key words: forage, indigofera, intercropping, nutrient production, sorghum ABSTRAK Penelitian ini dilakukan dengan tujuan untuk mengevaluasi produksi nutrien beberapa varietas sorgum yang dibudidayakan bersama leguminosa berkualitas (indigofera) dalam sistem tumpangsari, dan juga untuk menentukan kombinasi sorgum yang cocok dengan komposisi indigofera yang menghasilkan produksi nutrisi yang tertinggi dalam sistem. Penelitian ini dilakukan di Unit Pendidikan dan Penelitian Peternakan Jonggol (UP3J), sejak November 2014 sampai Maret 2015. Penelitian ini dilakukan dengan menggunakan rancangan acak lengkap pola faktorial dengan 2 faktor (3 x 4) dan 4 ulangan. Faktor pertama adalah varietas sorgum (PATIR 3.2 (S1), PATIR 3.7 (S2), dan CTY-33 (S3)). Faktor kedua adalah komposisi indigofera (0% indigofera (I0), 30% indigofera (I1), 40% indigofera (I2), dan 50% indigofera (I3)). Data dianalisis menggunakan analisis varian dan uji BNJ. Hasil analisis keragaman menunjukkan bahwa tidak ada interaksi antara varietas sorgum dan komposisi indigofera. Populasi indigofera yang mencapai 50% menghasilkan kandungan bahan kering, kandungan protein kasar, kandungan abu, produksi bobot segar, produksi bobot kering, produksi protein kasar, produksi abu dan kapasitas tampung tertinggi (P<0,01). Varietas CTY-33 menghasilkan kandungan bahan kering, produksi bahan kering (P<0,01), dan produksi protein kasar (P<0,05) tertinggi, sedangkan PATIR 37 m...

The mutant line of Brown-midrib sorghum has lower lignin content than conventional sorghum. The objectives of this research were to investigate the effects of plant maturity stages at harvest times on nutrient, fiber fraction, tannin content, volatile fatty acids (VFA) production, and in vitro fiber digestibility of mutant lines of Brown Midrib (BMR) sorghum. This research was arranged into a complete block design with a factorial arrangement in three replications. The first factor was a line of BMR sorghum consisted of 3 levels, i.e., Patir 3.1 (non-BMR line/control), Patir 3.2 (BMR line), and Patir 3.7 (BMR line). The second factor was the generative stages of sorghum consisted of 3 levels, i.e., flowering stage, soft-dough stage, and hard-dough stage. The observed variables were nutrient, fiber fraction, tannin content, in vitro rumen fluid characteristics, VFA proportion, acetate: propionate (A:P) ratio, and in vitro fiber-fraction digestibility (IVFFD). Data were analyzed by Analysis of Variance (ANOVA) and Duncan's Multiple Range Test (DMRT). No interaction between sorghum-mutant lines and harvest time on nutrient contents, except on total digestible nutrients (TDN), tannin, and VFA. The factor of sorghum-mutant line affected (p<0.01) crude protein (CP), crude fiber (CF), acid detergent fiber (ADF), lignin, neutral detergent fiber digestibility (NDFD), NH 3 , butyrate, isovalerate, and valerate. Maturity stages affected dry matter (DM), CF, ash, crude fat, fiber, and fraction, except hemicellulose, acid detergent fiber digestibility (ADFD), and NDFD, NH 3, isovalerate, and valerate. Patir 3.7 at the hard-dough stage produced the highest TDN, but the highest VFA was produced by Patir 3.1 at flowering stages. BMR sorghum-mutant lines produced higher ADF digestibility than non-BMR sorghum-mutant lines. The increasing NDF digestibility was significantly influenced by both sorghum-mutant lines and maturity stages (p<0.01). It is concluded that BMR sorghum-mutant lines at the hard-dough stage produce better nutrient and in vitro digestibility, but the butyric acid is higher in non-BMR sorghum-mutant lines.