GENETIC AND PHENOTYPIC TRENDS OF CALVING INTERVAL AND AGE AT FIRST CALVING IN A COMMERCIAL HOLSTEIN HERD

Document Type : Original Article

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1 Department of Animal production, Faculty of Agriculture, Cairo University, Giza, Egypt

2 Department of Animal Production, Faculty of Agriculture, Cairo University, Giza, 12613, Egypt

3 Department of Animal Production, Faculty of Agriculture, Cairo University

4 Department of Animal production, Faculty of Agriculture,Cairo University , Giza, Egypt

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