Estimation of direct and maternal. in Croatian Holstein breed

Transcription

1 Estiation of irect an aternal genetic variances for calving ease in Croatian Holstein bree Špehar M. Ivkić Z. Bulić V. Gorjanc G. Croatian Agricultural Agency Ilica Zagreb Croatia University of Ljubljana Biotechnical Fac. Anial Science Dep. Groblje 3 60 Dožale Slovenia

2 Introuction An iportant functional trait in airy cattle but not yet inclue in genetic evaluation of airy cattle in Croatia genetic paraeters neee!!! Ai: Estiate genetic paraeters for irect aitive genetic aternal aitive genetic Croatian Holstein bree

3 Material Central atabase of Croatian Agricultural Agency calving ease recors (after eiting!) = no proble ~3% = slight proble ~64% 3 = cow neee assistance ~4% 4 = veterinary assistance <% st an n+ parities Anial peigree 3 generations anials

4 Metho () Discrete trait! threshol oel however stanar Gaussian oel was use :) Bivariate anial oel (st an n+ parities) Fixe effects: sex*age(*parity) calving season region*year Rano effects: her*year irect an aternal genetic an peranent environent (only for n+)

5 Metho () To partially account for iscrete trait properties: haronization of scores by region an recoring perio heterogeneous resiual variances by sex of a calf 4 resiual variances (sex within parity class) Metho REML in VCE-6 average estiates fro 0 ata saples

6 Results

7 Results variance coponents Bivariate oel - heterogeneous resiual variances her*year: irect & aternal genetic: hy hy hy hy peranent environent: resiual: pe f f e e e e

8 Results resiual variances * By sex of calf within parity class st n+ Average Male Feale Average / larger ean (st ales) larger variance * SE~0.005

9 Results percentages * an correlations HY Direct (=h ) Maternal Per. st 7.5 (4.6 3.) 4.5 (4.0 5.) 3.5 (3. 4.0) / n+ 4.4 (.3 7.0) 9.9 ( ) 4. ( ) 5. ( ) Corr / * average (ales feales)

10 Results irect-aternal ± ± ± ± = ± SE covariances = correlations ρ ρ ρ ρ

11 Conclusions an future work Variance coponents were estiate for calving ease in Holstein cattle in Croatia Gaussian oel haronize calving ease scores heterogeneous resiual variances Coparison with threshol oel is on the way

12 Estiation of irect an aternal genetic variances for calving ease in Croatian Holstein bree Špehar M. Ivkić Z. Bulić V. Gorjanc G. Croatian Agricultural Agency Ilica Zagreb Croatia e-ail:spehar@hpa.hr University of Ljubljana Biotechnical Faculty Anial Science Departent Groblje 3 30 Dožale Slovenia The objective of this stuy was to estiate genetic paraeters for calving ease in Croatian Holstein bree. Data for first an later calvings were taken fro the atabase of the Croatian Agricultural Agency. Calving ease was score fro to 4 ( = no proble = slight proble 3 = cow neee assistance 4 = veterinary assistance). Scores were haronize by region an perio of recoring. The nuber of anials in peigree was Calving ease in the first an later parities was treate as two traits using a bivariate oel. Fixe effects in the oel were: calving season interaction of sex calving age an parity an interaction of region an calving year. Her an calving year interaction irect an aternal genetic effect were inclue as rano effects for first an later parities while peranent effect was also inclue for later parities. Resiual variance was assue heterogeneous by sex an parity (first an later calvings) to partly account for relationship of ean an variance in iscrete traits. Variance coponents were estiate fro Gaussian oel using REML etho as ipleente in the VCE-6 progra. The estiate variances (±stanar error) for the first secon an later parities (correlations) were: 0.07± ±0.004 (0.845) for her-year 0.07± ±0.006 (0.548) for irect genetic 0.04± ±0.004 (0.743) for aternal genetic an 0.08±0.003 for peranent effect. Correlation between irect an aternal genetic effect was for the first an for the later parities. Estiates for resiual variance followe biological expectations: 0.95 an 0.8 for ales an 0.04 an 0.6 for feales in the first an later parities respectively all stanar errors were about Results provie genetic paraeters for the application of genetic evaluation for calving ease in Croatian Holstein bree.