Factors affecting dairy performance Friesian and Friesian X Iraqi crosses

• L.M. Al-Ani

  Faculty of Science - Omar Al-Mukhtar University - Al-Bayda - Libya

  Author

• A.A. Al-Rawi

  University of Baghdad - Iraq.

  Author

Least - squares technique was used for analyzing 605 records of Friesian and their crosses with local Iraqi cattle. The cows were maintained at three farms owned by the Iraqi Ministery of Agriculture and the College of Agriculture, University of Baghdad. The records inclued in this study were collected during the period 1950 - 1979, and were used to evaluate several genetic and nongenetic sources of variation in persistency of milk production. These included sire, genetic group, parity, season of calving, and herd. It was found that genetic groups, herd and parity had significant effects on the persistency of milk production, while the sir and season of calving had no significan effects. It was also found that 1/2 Friesian was the best in persistency of milk production among all genetic groups included in this study. Heritability estimated by paternal half sib intraclass correlation, was 0.01.

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