Abstract:Data of 3251 lactation records for the first five lactations of 1022 Holstein-Friesian dairy cows at Alex-Kobenhagen farm during the period from 2000 to 2010 were used to determine the associations between levels of peak yield and peak day with some productive and reproductive traits. The data of peak yield (PY) was categorized as {PY1 (<33.4 kg), PY2 (33.4-<43.03 kg), PY3 (43.03-<52.6 kg) and PY4 (≥52.6 kg)} and the peak day (PD) was expressed as {PD1 (<23.8 d), PD2 (23.8-<77 d), PD3 (77-<131 d) and PD4 (≥131… Show more
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