Sigit PRASTOWO
Jurusan Hama dan Penyakit Tumbuhan. Fakultas Pertanian Universitas Jember Jln. Kalimantan 37 Kampus Tegalboto Jember 68121

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BIOLOGI PARASITOID KOINOBIONT OPIUS SP. (HYMENOPTERA: BRACONIDAE) PADA LARVA LALAT PENGOROK DAUN LIRIOMYZA HUIDOBRENSIS (DIPTERA: AGROMYZIDAE) PURNOMO, Hari; PRASTOWO, Sigit; DJADMIKO, Moh. Wildan; MABDUH, Shohab
Jurnal Pengendalian Hayati Vol 1 No 1 (2008)
Publisher : Fakultas Pertanian Universitas Jember

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Opius sp. is koinobiont endoparasitoid of L. huidobrensis larvae. Opius sp. has shortlife cycle, high fecundity and able to parasite at different larvae stages. The research objective was todetermine effect of larvae stages of LMF on parasitsm, fitness, development time and longevity ofOpius sp. The research was conducted at Laboratory of Biological Control and Glass house of Pestand Plant Diseases Departement, Agriculture Faculty, Jember University from from April until July2007. The insect were collected from Ngadisari, subdistrict of Sukapura, Probolinggo. The experimentwas done on two methods, choice and non choice test. Percentage of parasitization, the sting time,development time, longevity, sex ratio, body lenght, hind and hind tibia of adult female and male ofparasitoid Opius sp were examined. The result showed that the sting time of Opius sp. was influencedby larvae. The lates stages of LMF has the higher sting time compare early stages, 44,28 s on firstinstar, 54,9 s on second instar, and 80,68 third instar respectly. Parasitization of parasitoid Opius sp.was not influenced by larvae stage of L. huidobrensis. The percentage of parasitization on choice testwas 28,49% on first instar, 17,43% on second instar and 14,95% third instar. On the other hand, onnon chice test was 48,21% on first instar, 54,52% on second instar and 54,00% on third instar. Sexratio, adult fitness, body length, hind and hind tibia length, development time, longevity wereinfluenced by larvae stages.
POTENSI TEPUNG DAUN SIRSAK, SERAI, KENIKIR, JERUK NIPIS, DAN KLUWIH TERHADAP KUMBANG BUBUK KEDELAI (CALLOSOBRUCHUS ANALIS F.) PADA KEDELAI (GLYXINE MAX L.) DALAM SIMPANAN Dzulhijja, Laily Dwi; Wagiyana, Wagiyana; Prastowo, Sigit
Berkala Ilmiah Pertanian Vol 2 No 1 (2019): FEBRUARI
Publisher : Jember University Press

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ABSTRACT This study aims to determine the effect of soursop leaf flour, lemongrass flour, kenikir leaf flour, lime leaf flour, and kluwih leaf flour on: 1) mortality, 2) damage to seeds, 3) shrinkage of seed weight, 4) appearance of adult C. analysts on soybean seeds in deposits and 5) laying eggs of C. imago female eggs, 6) probit analysis LT50. The experiment was carried out using a Completely Randomized Design (CRD). As treatments are: A) controls; B) soursop leaf flour in doses of 1gr, 2gr, and 3gr; C) Serai leaf flour with doses of 1gr, 2gr, and 3gr; D) kenikir leaf flour with doses of 1gr, 2gr, and 3gr; E) lime leaf flour with doses of 1gr, 2gr, and 3gr; and F) kluwih leaf flour with doses of 1gr, 2gr, and 3gr. Each treatment uses five replications. The observed parameters were analyzed by "F" test variance then if it was significantly different to find out the difference in the effect of treatment, an Honest Real Difference Test was conducted at a level of 5% distrust. The best mortality results using the treatment of soursop leaf flour dose 3gr on 5 days amounted to 1.80 tails; 1 month is 6.60; 2 months totaling 13.40; and 3 months totaling 11.20. The results of the observation of the number of eggs produced by C. C. the best analyst was the treatment of soursop leaf flour dose 3gr on 5 days amounting to 139 items, 1 month 119.20 items; 2 months 91.20 items; and 3 months 72.20 items. The best imago observation results were treatment of soursop leaf flour dose 3gr at 1 month amounting to 132.20 tails; while at 2 months there were 79 heads. The best observation of seed damage and shrinkage of seed weight was the treatment of soursop leaf flour with a dose of 3gr, in the damage of seeds of 67.40 grains of seed damage; while the seed weight is reduced by 17.94 gr. The results of the best analysis of Probit LT50 were treatment of soursop leaf flour with a dose of 3gr because it could kill 50% of the population C. Analysts with a relatively short time were 9 days after treatment. Keywords: C. analis, leaf flour, dosage ABSTRAK Penelitian ini bertujuan untuk mengetahui pengaruh tepung daun sirsak, tepung daun serai, tepung daun kenikir, tepung daun jeruk nipis, dan tepung daun kluwih terhadap: 1) mortalitas, 2) kerusakan biji, 3) susut bobot biji, 4) kemunculan dewasa C. analis pada biji kedelai dalam simpanan dan 5) peletakan telur imago betina C. analis, 6) analisis probit LT50. Percobaan dilakukan dengan menggunakan Rancangan Acak Lengkap (RAL). Sebagai perlakuan adalah: A) kontrol; B) tepung daun sirsak dengan dosis 1gr, 2gr, dan 3gr; C) tepung daun serai dengan dosis 1gr, 2gr, dan 3gr; D) tepung daun kenikir dengan dosis 1gr, 2gr, dan 3gr; E) tepung daun jeruk nipis dengan dosis 1gr, 2gr, dan 3gr; dan F) tepung daun kluwih dengan dosis 1gr, 2gr, dan 3gr. Tiap perlakuan menggunakan lima ulangan. Terhadap parameter yang diamati dilakukan analisis dengan sidik ragam uji ?F? kemudian apabila berbeda nyata untuk mengetahui perbedaan pengaruh perlakuan dilakukan Uji Beda Nyata Jujur pada taraf ketidakpercayaan 5%. Hasil mortalitas terbaik menggunakan perlakuan tepung daun sirsak dosis 3gr pada 5 hari sejumlah 1,80 ekor; 1 bulan sejumlah 6,60 ekor; 2 bulan sejumlah 13,40 ekor; dan 3 bulan sejumlah 11,20 ekor. Hasil pengamatan jumlah telur yang dihasilkan imago C. analis terbaik adalah perlakuan tepung daun sirsak dosis 3gr pada 5 hari sejumlah 139 butir, 1 bulan 119,20 butir; 2 bulan 91,20 butir; dan 3 bulan 72,20 butir. Hasil pengamatan imago muncul terbaik adalah perlakuan tepung daun sirsak dosis 3gr pada 1 bulan sejumlah 132,20 ekor; sedangkan pada 2 bulan sejumlah 79 ekor. Hasil pengamatan kerusakan biji dan susut bobot biji terbaik adalah perlakuan tepung daun sirsak dosis 3gr, pada kerusakan biji sejumlah 67,40 butir kerusakan biji; sedangan susut bobot biji sejumlah 17,94 gr. Hasil Analisis Probit LT50 terbaik adalah perlakuan tepung daun sirsak dosis 3gr karena dapat mematikan 50% populasi C. analis dengan rentan waktu yang cukup singkat yaitu pada 9 hari setelah perlakuan. Kata kunci: C. analis, tepung daun, dosis
STUDI BIOLOGI DAN PREFERENSI Carpophilus dimidiatus F. (Coleoptera: Nitidulidae) PADA BEBERAPA JENIS KACANG-KACANGAN Jihan, .; Suharto, .; Prastowo, Sigit
Berkala Ilmiah Pertanian Vol 1, No 4: MEI
Publisher : Berkala Ilmiah Pertanian

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Abstract

[ENGLISH] Carpophilus dimidiatus is an important pest that attack post harvest grains and dried fruit. The losses caused by C. dimidiatus attacks is quite high. C. dimidiatus has reported attacks on nut product. This study aims to know the biology of C. dimidiatus and the level of attacks on several nut. This research was conducted in Pest laboratory, Pest and Plant Disease Department of the Agricultural Faculty, Jember University from September 2012 until December 2012. The method used in this research was conduct biology test and preference test consisting of choosen test and non choosen test. The results showed C. dimidiatus life cycle needs 35-47 days or average 39,33 days wich consists of eggs 2-5 days, first instar 3-4 days, second instar 2-6 days, third instar 2-6 days, fourth instar 2-5 days, fifth instar 3-6 days, 7-18 days at sixth instar, pupa are 3-8 days. The egg colour are translucent white with a shape like a grain of rice, the larval body color are yellowish-white with golden brown head and tip of abdomen, the pupa are white with brown eyes. Fecundity C. dimidiatus are 162 eggs for 37 days, and about 5.4 eggs a day. Fertility of C. dimidiatus are 53.7%. Sex ratio of C. dimidiatus are 1:2. Three pairs of C. dimidiatus that made damages on 50 grams peanut local varieties can reach 54.90% during the eigth weeks of storage period. Keywords: Carpophilus dimidiatus; nuts; preferences [INDONESIAN] Carpophilus dimidiatus adalah hama penting yang menyerang biji-bijian dan buah kering pasca panen. Kehilangan hasil yang diakibatkan oleh serangan C. dimidiatus cukup tinggi. Serangan C. dimidiatus juga ditemukan pada produk kacangkacangan. Penelitian ini bertujuan untuk mengetahui biologi dari C. dimidiatus dan tingkat serangan pada beberapa jenis kacang. Penelitian ini dilakukan di Lab. Hama Jurusan Hama dan Penyakit Tumbuhan Fakultas Pertanian Universitas Jember mulai bulan September 2012 hingga Desember 2012. Metode yang dilakukan adalah melakukan Uji Biologi dan Uji Preferensi yang terdiri dari uji pilihan dan uji non pilihan. Hasil penelitian menunjukkan siklus hidup C. dimidiatus membutuhkan waktu 35-47 hari yaitu rata-rata 39,33, terdiri dari telur 2-5 hari, larva instar ke-I 3-4 hari, larva instar ke-II 2-6 hari, larva instar ke-III 2-6 hari, larva instar ke-IV 2-5 hari, larva instar ke-V 3-6 hari, larva instar ke-VI 7-18 hari, pupa 3-8 hari. Warna telur putih bening dengan bentuk seperti bulir beras, warna tubuh larva putih kekuningan dengan ujung kepala dan ujung abdomen berwarna coklat keemasan, warna pupa putih dan bagian mata berwarna coklat. Fekunditas C. dimidiatus untuk satu pasang imago dapat menghasilkan 162 telur selama 37 hari, dan perharinya sekitar 5,4 butir telur. Fertilitas sebesar 53.7%. Seks rasio imago jantan:betina adalah 1:2. Infestasi tiga pasang C. dimidiatus pada 50 gram kacang tanah varietas lokal mengakibat kerusakan 54.90 % selama masa simpan delapan minggu. Kata Kunci: Carpophilus dimidiatus; Kacang – kacangan; preferensi How to citate: Jihan, Suharto, S Prastowo. 2014. Studi biologi dan preferensi Carpophilus dimidiatus F. (Coleoptera: Nitidulidae) pada beberapa jenis kacang-kacangan. Berkala Ilmiah Pertanian 1(4): 73-76.
PENGARUH KEBERADAAN CORPUS LUTEUM TERHADAP KUALITAS DAN TINGKAT MATURASI OOSIT DOMBA LOKAL UMUR PUBERTAS AWAL SECARA IN VITRO Widyastuti, Rini; Syamsunarno, Mas Rizky Anggun Adipurna; Yusuf, Alvin; Ridhlo, Muhammad Rosyid; Prastowo, Sigit
Jurnal Agripet Vol 18, No 2 (2018): Volume 18, No. 2, Oktober 2018
Publisher : Agricultural Faculty

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17969/agripet.v18i2.12103

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ABSTRAK. Penelitian ini bertujuan mengetahui pengaruh keberadaan corpus luteum (CL) pada ovarium domba umur pubertas awal terhadap kualitas oosit hasil koleksi dan tingkat maturasinya secara in vitro (IVM). Sebanyak 279 oosit digunakan, terbagi pada kelompok tanpa CL (CL-) sebanyak 143 dan dengan CL (CL+) sebanyak 136. Oosit dipilih berdasarkan homogenitas sitoplasma dan dikelompokkan sesuai jumlah lapisan sel kumulus yaitu grade 1 ( 4 lapis), grade 2 (3?4 lapis) dan grade 3 (0?2 lapis). Media IVM menggunakan Tissue Culture Media 199 ditambah antibiotik, Follicle Stimulating Hormone, dan 10% Fetal Bovine Serum. Maturasi dilakukan pada inkubator 38,5°C, 5% CO2 selama 24 jam. Pasca IVM, tingkat kematangan oosit dievaluasi berdasar kemunculan Polar Body I (PB I). Hasil menunjukkan bahwa keberadaan CL tidak berpengaruh terhadap kualitas oosit yang dikoleksi pada semua grade. Keberadaan CL berpengaruh pada tingkat kematangan oosit pada grade 1 sebesar 48,64% dibandingkan CL- sebesar 47,19% (p 0,05). Berdasarkan hasil penelitian disimpulkan bahwa berpengaruh pada tingkat kematangan oosit setelah IVM. Hasil penelitian menggambarkan potensi penggunaan oosit ternak umur pubertas awal untuk digunakan lebih lanjut dalam program produksi embrio secara in vitro. (Effect of the presence of corpus luteum on oocytes quality and in vitro maturation rate of ewes at early puberty) ABSTRACT. This study aims to know effect of presence of corpus luteum (CL) to collected oocytes quality and its maturation rate post in vitro maturation (IVM), on local ewes ovary at early puberty. In total 279 oocytes were collected, 143 without CL (CL-) and 136 with CL present (CL+). Oocytes were selected according to sitoplasma hemogenity, divided into 3 grades according to cumulus cell (CC) layer namely Grade 1, 2 and 3 indicated by 4, 3?4, and 0?2 CC layers, respectively. The IVM media was Tissue Culture Media 199 supplemented with antibiotic, Follicel Stimulating Hormone, and 10% Fetal Bovine Serum following culture at 38.5°C and 5% CO2. Twenty four hours post IVM, oocytes were evaluated on the presence of Polar Body I. Result showed that oocytes quality were not different among group in all grades. The present of CL gives better maturation rate in grade 1 compared to CL- (48.64 vs 47.19%; p 0.05). The present finding show that the presence of CL improves oocytes maturation rate post IVM. Moreover, this study shows the potency of using oocytes from ewes ovary at early puberty for further in vitro embryo production program
KURVA PRODUKSI TELUR DI AWAL MASA PENELURAN PADA PUYUH YANG DIBERI RANSUM DENGAN KANDUNGAN PROTEIN BERBEDA Ratriyanto, Adi; Hidayat, Brian Fikri; Widyas, Nuzul; Prastowo, Sigit
Jurnal Ilmu Ternak Universitas Padjadjaran Vol 19, No 1 (2019): June
Publisher : Fakultas Peternakan, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/jit.v19i1.22171

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Penelitian bertujuan untuk mengkaji pola produksi dan aplikasi model regresi logistik produksi telur puyuh yang diberi ransum dengan level protein berbeda. Sebanyak 225 ekor puyuh didistribusikan dalam 3 perlakuan dan 5 ulangan; jumlah puyuh masing-masing ulangan 15 ekor. Perlakuan yang diberikan adalah level protein kasar (PK) dalam ransum sebesar 16,5% (P1), 18% (P2) dan 19,5% (P3). Data produksi telur diambil sejak awal peneluran pada masa adaptasi dan selama dua periode produksi telur (2×28 hari) pada masa perlakuan. Data dianalisis menggunakan program R. Perlakuan P2 dan P3 menghasilkan produksi telur yang lebih tinggi daripada P1 (P<0.05). Model logistik produksi telur puyuh menunjukkan bahwa puncak produksi tertinggi dicapai oleh P3 sedangkan rentang dan laju produksi terbesar dicapai P1. Data aktual produksi telur memiliki kesesuaian (fitness) yang tinggi (R2=0,92?0,97) dengan model logistik. Berdasarkan hasil tersebut, disimpulkan bahwa semakin tinggi protein kasar menghasilkan produksi telur yang tinggi. Model regresi logistik dapat digunakan untuk menganalisis pengaruh perlakuan biologis terhadap produksi telur puyuh serta memiliki kesesuaian yang tinggi dengan data aktual.
RESPON BIRAHI KAMBING PERANAKAN ETAWA BETINA YANG MENDAPAT SUPLEMENTASI PAKAN UREA MOLASES MINERAL ANTI PARASIT BLOK DALAM PROGRAM SINKRONISASI ESTRUS MENGGUNAKAN HORMON PROSTAGLANDIN F2α Prastowo, Sigit; Ratriyanto, Adi; Sudiyono, Sudiyono; Sunarto, Sunarto
Caraka Tani: Journal of Sustainable Agriculture Vol 25, No 2 (2010): October
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/carakatani.v25i2.14064

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Penelitian ini bertujuan untuk mengetahui respon estrus kambing PE betina yang mendapat pakan suplemen UMMAT blok, dalam program Sinkronisasi Estrus. Penelitian dilaksanakan di Experimental Farm Jatikuwung, Jurusan Peternakan, Fakultas Pertanian, Universitas Sebelas Maret. Materi yang digunakan adalah 9 ekor kambing PE betina yang dibagi menjadi 3 kelompok perlakuan. Kelompok 1 adalah perlakuan pemeliharaan dengan pakan hijauan, kelompok 2 pakan hijauan dan UMMAT blok  dan kelompok 3 pakan hijauan dan konsentrat. Rancangan percobaan menggunakan Rancangan Acak Lengkap, analisa data menggunakan anova. Sinkronisasi Estrus dengan injeksi 0.5 ml hormon PGF2α secara intramuscular, interval 11 hari pengamatan waktu, lama dan tanda-tanda estrus pada setiap individu kambing seluruh kelompok perlakuan.Hasil penelitian diperoleh data estrus pada masing-masing kelompok yaiu, waktu estrus (jam) 30.67, 28.67, 27.66 dan lama estrus (jam) 33.67, 35.67, 35.66. Hasil uji anova menunjukkan beda nyata (P&lt;0.05) pada waktu estrus antara kelompok 1 dengan kelompok 2 dan 3. Secara deskriptif terdapat tanda-tanda estrus yang teramati pada seluruh kelompok perlakuan yaitu vulva bengkak, mengeluarkan mucus dan ekor diangkat.Kesimpulan dari penelitian ini bahwa UMMAT blok mampu meningkatkan dan memperbaiki kinerja reproduksi kambing PE betina dalam proses Sinkronisasi Estrus.
KUALITAS SEMEN SEGAR SAPI BALI (BOS JAVANICUS) PADA KELOMPOK UMUR YANG BERBEDA Prastowo, Sigit; Dharmawan, Pipin; Nugroho, Tristianto; Bachtiar, Aris; -, Lutojo; Pramono, Ahmad
Jurnal Ilmu Ternak Universitas Padjadjaran Vol 18, No 1 (2018): June
Publisher : Fakultas Peternakan, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/jit.v18i1.17684

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Penelitian ini bertujuan untuk mengetahui kualitas semen segar sapi Bali pada kelompok umur yang berbeda. Sampel yang digunakan berupa semen segar dari 8 pejantan sapi Bali di Balai Besar Inseminasi Buatan (BBIB) Singosari Malang, Jawa Timur, terbagi menjadi 2 kelompok umur yaitu 4 dan 7 tahun. Rata-rata bobot badan sapi pada kelompok umur 4 tahun adalah 656,75±32,69 Kg, dan  lingkar skrotum 27,5±1,64 cm sedangkan pada kelompok umur 7 tahun adalah 615,5±72,59 Kg dan 27,93±0,74 cm. Kualitas semen segar diamati dari 10 kali penampungan menggunakan vagina buatan. Parameter yang diamati meliputi volume (ml), pH, konsentrasi (x106/ml), motilitas (%), persentase spermatozoa hidup (L/D; %), abnormalitas primer (%) dan abnormalitas sekunder (%). Untuk mengetahui perbedaan antar 2 kelompok umur, data kualitas semen dibandingkan menggunakan t-test. Hasil penelitian menunjukkan bahwa pada kelompok umur 4 dan 7 tahun masing-masing diperoleh volume 4,55±0,91 ml dan 5,18±1,58 ml, pH 6,51±0,06 dan 6,52±0,01, konsentrasi 962,30±390,50×106/ml dan 1079,00±90,56×106/ml, L/D 71,88±2,58% dan 72,02±1,35%, motilitas 68±3,11% dan 66,04±6,30%, abnormalitas primer 1,054±0,20% dan 0,93±0,14% serta abnormalitas sekunder 3,54±0,48% dan 4,24±0,31%. Volume dan abnormalitas sekunder secara statistik menunjukkan adanya perbedaan yang nyata (P<0,05). Berdasarkan hasil penelitian dapat disimpulkan bahwa pada kelompok pejantan sapi Bali umur 7 tahun menghasilkan volume semen dan abnormalitas sekunder lebih tinggi dibandingkan umur 4 tahun.Kata kunci: sapi Bali, pengaruh umur, kualitas semen segar
Performan Anak Babi Silangan Berdasarkan Paritas Induknya Wahyuningsih, N; P. Subagyo, Y B; Sunarto, Sunarto; Prastowo, Sigit; Widyas, N
Sains Peternakan: Jurnal Penelitian Ilmu Peternakan Vol 10, No 2 (2012): Sains Peternakan
Publisher : Universitas Sebelas Maret (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/sainspet.10.2.56-63

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The aim of this study was to determine the effect of performance of the parent parity of hybrid piglets, and to know the parity that produces good performance of the hybrid piglets. This research was conducted for four months in the company of CV. Adhi Farm in Kebakkramat, Karanganyar. The material were three boars (Landrace, Duroc and Hampshire), 21 Landrace sows, piglets from the marriage, and the data from the company. The design of experiments was nested design. The variables that were observed or estimated included birth weight, littersize, the correlation of littersize to the birth weight, and birth weight variation in birth. The data showed the influence, then followed by Least Significant Difference Test (Least Significant Difference) for parity nested in males and Duncans Multiple Range Test for parity. The results showed that parity and male parity nested exerted a highly significant (P &lt;0.01) for birth weight and littersize. Between birth weight and littersize were compared from each parity and each male parity nested were significantly different (P&lt;0.05). Balanced birth weight and hybrid piglets littersize were at parity 1. The correlation between weight birth and littersize were -0,17. The variation in birth weight per littersize was 0,02 to 0,16. The conclusion of this study is the influence of the parity sow has effect on birth weight of piglet’s performance of hybrids and littersize.Keywords: performance, piglets, sow parity
Evaluasi Produktivitas Domba Ekor Gemuk Berdasar Reproductive Rate Prastowo, Sigit
Caraka Tani: Journal of Sustainable Agriculture Vol 20, No 2 (2005): October
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/carakatani.v20i2.20496

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Fat Tailed Sheep represent one of Indonesian livestock that having excellence of comparability with other ruminants livestock. The excellence is quickly adult, short of pregnant age, and has the nature of bearing twin, so if evaluated from development aspect will be very beneficial. Reproductive Rate (RR) is a mount of reproduction ability from a group of ewes. Reproductive Rate defined as amount of weaned lamb by ewe every year. Variable/component related to RR are litter size, lamb mortalities before weaning and lambing interval.Litter size is general influenced by difference of breeds, age and sufficiency of nutrition. Litter size is peculiarly influenced by ovulation rate that determined by breed, age, nutrition and parity. Lamb age, litter size, birth weight, season, nutrition and parity are influenced lamb mortalities before weaning. Lambing interval determined by nutrition factor and management, which is matting pattern and lamb weaning.
Conventional and Mixed Model Approach to Estimate Heterosis of the Growth Traits in Boer Goat’s Crossbred Offspring Populations Widyas, Nuzul; Prastowo, Sigit; Nugroho, Tristianto; Ratriyanto, Adi
Caraka Tani: Journal of Sustainable Agriculture Vol 34, No 1 (2019): April
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/carakatani.v34i1.27620

Abstract

Heterosis is often utilized as a success indicator in a crossbreeding program. It is defined as the deviation of the crossbred means relative to their parental breeds. Heterosis mechanism is highly dependent on the genetic factors and thus, we incorporated genetic information in its estimation. The objective of this article was to compare heterosis estimated with conventional and mixed model approaches. In total, phenotypes of 3804 individuals were recorded. Data were obtained from a crossbreeding experiment involving Boer bucks and Jawarandu does. Observed traits were birth weight, weaning weight and average daily gain. Conventional and mixed model methods were used to estimate the heterosis. The heterosis values (%) between B×B vs B×J, estimated with conventional method were -11.38, -10.51 and -10.39; with mixed model were -6.23, -9.27 and -9.68 for BW, WW and ADG respectively. Heterosis values in B×(B×J) relative to B×B, estimated with conventional method were -6.16, -10.35 and -11.69; whereas with mixed model were -8.01, -10.82 and -9.14 for BW, WW and ADG respectively. Conventional method tends to underestimate the means phenotype with lower standard errors compared to mixed model analysis results in all traits. Conventional method also introduces biased heterosis estimates compared to the mixed model. Conventional method ignores any potential effects in the estimation procedures; whereas mixed model approach incorporates all the systematic and random effect including family relationship information. Thus, mixed model produced more reliable results in genetic parameters estimation. We recommend employing mixed model analysis in estimating heterosis.