Estimation of Genetic Parameters for Productive and Reproductive Traits in Ongole Cattle

Abstract

The sllldy was undertaken to see the performance ol Ongole CaWe along wrth magnitUde of genebc and non genebc factors A total 3070 recofd ol729 Ongole cows. mamta•ned at 4 1111e stock farms (LRS LAM Guntur LRS Mahanandi GCBF Chadalwada and GLF Ch1ntaldeV1) 1n Andhra Pradesh daughter of 67 bulls dunng 25 years from 1985 to 2009 were used 1n analysos The tra1ts were conSidered age at first cahnng (AFC), calf we~ght at buth(CW). Jactabon milk Yield (l.MY), peak Y•eld(PY). lactabon length (Ll). seMCe penod (SP) dry penod (DP) and calving mterval (Cf) The AFC was 1459 01±28 99 days It was Significantly allected by the set of sires. farm penod and season of l:w1h CW was 26 09t0.36 kg Etl"ect ol farm, penod of bor1h. sex and penry were Sl(lnrf1C81lt on call weight at l:w1h The male calves were hea111er than female calves The lcHt squares means of the LMY PY and Ll were 678 84t43 It kQ. 3 98±0.14 kg and 225 78t9 70 days LMY and LL was slgmficantly affected by set of Sires. farm and panty. PY was s1gmficantty Influenced by farm, penod and season ofcaMng and panty SP, OP and Clwas261.26±2615days, 347 91:1.26.87 days and 555.71±23.93 days. These traKs wore slgnifiCanUy affected by farm and panty The set had significant effect on Cl The hentabohty estimates were medium for AFC (0 SO±O 13) and low for CW (0 13±0 03), LMY (0 17±0.04). PY (0 14±0 03) Ll (0 13t0 03), SP (0 16±0 04) OP (0 15til 04) and Cl (0 12!0 04) The genebc correlation of l.MY was high wilh PY (0 &4±0 II) and LL (0 87t0 05) PY had medium genebe correlation wilh LL (0 4-4±0 17) SP had hogh genellc (X)ITelabon with OP (0 75±0 09) and very htgh With Cl (0 99%0 01) OP had also htgh genetic correlation With Ct (0 80±0 06) LMY had high phenotype and enwonmental correlabon wrth PY (0 71 andO n) end LL (0 82 and 0 .82) PY had medium phenotypic and environmental correlation with LL (0 50 and 0 SO). SP had high phenotypic and environmental correlaUon w1th OP (0.82 and 0.84) and very high wrth Cl (0 94 and o 94) DP had high phenotypiC and envtronmental correlation with Cl (0 84 and 085)