Pengaruh Penambahan Crude Tannin pada Sperma Cair Kambing Peranakan Ettawa yang Disimpan Selama 14 Hari terhadap Viabilitas Spermatozoa (The Effect of Crude Tannin Addition to Liquid Semen of Ettawa Crossbred Goat on The Viability of Spermatozoa During 14 - Putranti, Oktora Dwi (Faculty of Animal Science, Universitas Gadjah Mada, 2012)