Growth Hormone Receptor (GHR) gene play important roles in duck performances due to their crucialfunctions in growth and has been considered as a candidate gene for growth traits. This reasearch wasaimed to indification polymorphism of Growth Hormon Receptor (GHR) gene in Sikumbang Janti duckand this study used 68 blood duck. Polymerase chain reaction (PCR) and sequencing analysis wereconducted to detect SNP existence in exon 10 of GHR gene. The result of this study showed that wasfound two SNP at g.1112 A>G and g.1304 C>T with transision mutation in exon 10 GHR gene. Genotypesfound in the g.1112 A>G were AA and GG with types of Allele A and G. Genotypes found in the g.1304T>C the were TT and CC with types of Allele T and C. Polymorphism of GHR gene were polymorphicand Population of Sikumbang Janti duck in Hardy-Weinberg equilibrium. It could be concluded thatGHR gene has potential to can be marker genetic in Sikumbang Janti ducks.

Penambahan rimpang temulawak (Curcuma xanthorriza Roxb) dan mineral zink dalam pakan terhadap performan, bobot organ fisiologi, persentase karkas, dan gambaran darah broiler dalam situasi panas. Pada studi ini digunakan ayam broiler CP 707 sejumlah 80 ekor, menggunakan metode eksprimen. Penambahan rimpang temulawak pada pakan basal dan mineral zink pada air minum, yaitu P0 (pakan basal tanpa temulawak dan zink), P1 (1% rimpang temulawak dan 40 ppm mineral zink), P2 (2% rimpang temulawak dan 40 ppm mineral zink), dan P3 (3% rimpang temulawak dan 40 ppm mineral zink). Peubah yang diukur performan (pertambahan bobot badan, kosumsi ransum, konversi ransum, dan kosumsi air minum), bobot organ fisiologi (bobot hati, tiroid, ginjal, dan limpa), karkas (bobot karkas, persentase karkas, dan lemak abdominal) serta gambaran darah (jumlah eritrosit, hemoglobin, dan nilai hematokrit). Analisa keragaman mengartikan bahwa penggunaan rimpang temulawak dalam pakan dan mineral zink melalui air minum menunjukkan tidak berpengaruh nyata (P>0,05) pada peubah. Kesimpulannya bahwa walaupun ayam broiler dalam situasi panas akan dapat di atasi dengan penambahan rimpang temulawak dalam pakan basal dan pemberian mineral zink melalui air minum.