RIPITABILITAS REPEATABILITY Rumus umum r Vg Vep VP

RIPITABILITAS (REPEATABILITY) Rumus umum : r = Vg + Vep -------VP

Rumus umum P=G+E E = Ep + ET r= Vg + Vep -------VP

REPEATABILITY (r) 1. The ability to repeat expression of particular trait on the future/ next production period 2. Correlation between (2 periods), or among (3 or more periods) measurements 3. Examples : Cow no. : 1 st lact. (100 kg) : 2 nd lact. (100 kg) : 1 50 55 2 60 62 3 58 59 4 62 62. 5 5 56 58 r?

Repeatability of fther traits

Relationship between repeaability, heritability, genetic correlation Hubungan antara : Generasi 0 : Periode I : X 1 rp X 2 r Generasi I : Periode I : X 1 X 2 Periode II : X 1 X 2 r Periode II : X 1 X 2 Periode III : X 1 rp X 2 Periode III : X 1 X 2 h 2 rg

Method to estimate repeatability CONTOH I 1. Metode korelasi BW I 18 22 24 21 19 18 22 23 26 BW II 19 21 22 23 20 20 22 24 25 2. Anova Yij = U + ai + eij

σ2 w r = --------σ2 w + σ2 e Sumber keragaman db Diantara individu Anova JK KT KTH M– 1 JKw KTw σ2 w + k 1σ2 e Dalam individu diantara pengukuran n. - M JKe KTe σ2 w Total n. – 1 k 1 = 1/(M-1) { n. – (∑ni 2 / n. )} Kalau pengukuran per individu sama maka k 1 = k yi banyaknya ulangan/ pengukuran per individu. Di mana : M adalah banyaknya individu, n. banyaknya semua catatan/ pengukuran, ni adalah pengukuran per individu

Ripitabilitas dengan Anova birth weight/ BW (kg) CONTOH II No. /identity Milk III 1 20 21 22 2 19 20 21 3 22 20 4 22 23 5 21 20 6 20 23 7 23 24 8 23 24 9 18 19 20 10 19 24

SE r = √ 2(1 -r) 2 [1+(k 1 -1) r]2 / k 1 (k 1 -1) (M-1) Estimasi r + SE Selamat belajar

Nama : 1. Indah Kusumawati 2. Elysa 3. Fitria