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GENETIC PARAMETERS FOR INCIDENCE OF PNEUMONIA IN HOLSTEIN CATTLE AND THEIR CALFS IN CENTRAL IRAQ | ||
| IRAQ JOURNAL OF AGRICULTURE | ||
| Article 1, Volume 14, Issue 1, 2009, Pages 0-0 | ||
| Authors | ||
| G. A. Baghdasar; A. A. Nief | ||
| Abstract | ||
| Ststistical analysis were performed for 2046 total milk production records and for breeding and veterinarian records belonged to incidence of pneumonia in Holstein cattle and their calfs in AL-Nasar Dairy Cattle Station, United Company for Animal Resources in AL-Sewayra between 1998 to 2001. Statistical model by SAS (2001) was used. Overall mean ± SE for total milk production (TMP) was 4163.39 ± 93.35 kg in lactation period (LP) 313.77 ± 6.56 days for by pneumonia infected cattle. Heritability estimate for pneumonia in cattle was 0.07 and was higher in calfs before (0.31) and after weaning (0.35). Heritability for TMP and LP were 0.10 and 0.19 respectively. Genetic correlations between pneumonia incidence with TMP and LP were -0.46 and -0.0001 respectively. Phenotypic correlations for pneumonia characters with the same parameters were -0.06 and 0.04. Further studies were warranted to study the effect of pneumonia infection on production and reproduction performances in Holstein cattle. | ||
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