Drought is a natural disaster that causes difficulties meeting household, agriculture, and industrial water needs. Drought often occurs in various regions in Indonesia, one of which is the Bojonegoro Regency. Bojonegoro Regency has the highest number of villages experiencing drought in East Java Province in 2019. This study aims to map the drought severity in the Bojonegoro Regency based on the results of the Normalized Difference Drought Index (NDDI) computation. The method used to obtain NDDI was by subtracting the Normalized Difference Vegetation Index (NDVI) by the Normalized Difference Water Index (NDWI) and then dividing by the NDVI plus the NDWI. The results showed five drought severity classes in Bojonegoro Regency: very low, low, medium, high, and very high. Areas classified as high and very high severity have an area of 1,534.32 (0.66%) and 99.38 ha (0.04%), respectively. These results indicate that many areas have the potential to experience drought in Bojonegoro Regency. The results of this analysis can be an input to the government to carry out mitigation efforts such as building reservoirs and infiltration wells, preserving the karst area, and increasing the vegetation cover against drought disasters in the future.
Ayam IPB-D1 merupakan jenis ayam lokal dari hasil persilangan antara jantan F1 PS (Pelung x Sentul) dengan betina F1 (Kampung x Ras pedaging paren stock Cobb). Penelitian ini bertujuan untuk mengevaluasi performa, kualitas semen, dan freezability spermatozoa ayam IPB-D1 pada konsentrasi Immunoglobulin Yolk (IgY) berbeda. Materi yang digunakan yaitu ayam IPB-D1 jantan sebanyak 20 ekor, terdiri atas 10 ekor ayam dengan konsentrasi IgY rendah dan 10 ekor IgY tinggi dengan ayam umur 8 bulan. Variabel yang diamati yaitu performa yakni konsumsi pakan, pertambahan berat badan, morbiditas dan mortalitas, kualitas semen segar dan kualitas semen beku (freezability). Data dianalis menggunakan uji-t menggunakan program SAS dengan membandingkan antara konsentrasi IgY tinggi dan IgY rendah. Hasil analisis performa ayam IPB-D1 tidak berbeda (P>0.05) terhadap IgY yang berbeda. Hasil kualitas semen menunjukkan perbedaan yang signifikan terhadap konsistensi semen dan motilitas, viabilitas, konsentrasi serta konsentrasi spermatozoa per ejakulat. Ayam IPB D-1 pada dua konsentrasi IgY tidak berbeda nyata (P>0.05) terhadap motilitas semen segar dan recovary rate, namun Ayam IPB D-1 dengan konsentrasi IgY tinggi memiliki motilitas spermatozoa pasca thawing lebih baik daripada (P<0.05) Ayam dengan konsentrasi IgY yang rendah.
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