The Relationship of Progesterone and Estradiol Concentrations During Pregnancy with Lamb Birth Weigh In Javanese Thin-Tail Ewes

Tujuan penelitian ini adalah untuk mempelajari hubungan antara konsentrasi progesteron dan estrogen selama kebuntingan dengan bobot lahir pada domba ekor tipis.  Tiga puluh sembilan domba bunting digunakan dalam penelitian ini. Domba percobaan disuntik PGF2α dua kali secara intra muskuler dengan interval sebelas hari.  Satu-dua hari setelah penyuntikan terakhir domba percobaan dikawinkan secara alami melalui perkawinan kelompok.  Sampel darah diambil setiap bulan (0 – 5 bulan) selama periode kebuntingan untuk menentukan konsentrasi progesterone dan estrogen.  Bobot lahir anak ditimbang sekitar 12 jam setelah kelahiran.  Hasil penelitian menunjukkan bahwa jumlah anak sekelahiran, konsentrasi progesterone dan estradiol serum induk pada bulan kedua kebuntingan secara positif berkorelasi dengan bobot lahir anak.  Disimpilkan bahwa semakin tinggi konsentrasi progesterone dan estradiol selama kebuntingan akan semakin tinggi total bobot lahir anak.  Disarankan bahwa peningkatan konsentrassi progesterone dan estradiol selama kebuntingan dapat memperbaiki pertumbuhan prenatal dan bobot lahir. (Animal Production 6(1): 49-55 (2004) Key Words: Progesteron, Estradiol,  Bobot Lahir, Kebuntingan, Domba

Sexual Activity of Indigenenous Ram Base on Ear Type

Research was conducted to know of sexual activity of indigeneous ram in experimental station, Animal Research Institute, Ciawi-Bogor. Twelve ram were roundly mated with two ewes for fiveteen minutes. All ram were allocated into two groups base on ear type (long and short). The variable observed were time of climbing, time and sum of ejaculation interval with time of climbing, and mating efficiency. Data analyses were used t test. The result of analyses showed that first time of ejaculation in ram of long ear type (4,92 ± 2,61 m) was longer than short ear type (1 ± 0,68 minute) (P<0,01). Sum of ejaculation in long ear type (1,33 ± 0,81 time) was leaster than short ear type (3 ± 1,09 time) (P<0,05). Ejaculation interval with to follow climbing in long ear type (5,43 ± 3,23 minute) was longer than short ear type (2,29 ± 1,76 minute) (P<0,05). Mating efficiency showed that highly significantly (P<0,01). In ram of short ear type (3,6 time) was more efficient than ram of long ear type (1,38 time). The first time of climbing, sum of climbing, and ejaculation interval were has not significantly (P>0,05). It was concluded that the mating rate in indigeneous ram of short ear type was higher than long ear type. (Animal Production 2(2): 83-91 (2000) Key words : indigeneous ram, sexual activity, mating efficiency.