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Age at first calving affecting the lactation traits during first three lactations in F1 crossbred cows

, : Age at first calving affecting the lactation traits during first three lactations in F1 crossbred cows. Livestock Adviser 13(8): 5-10

Records of 151 Sahiwal X Jersey, Sahiwal X Danish Red and Sahiwal X Holstein-Friesian cows were analysed. Age at 1st calving averaged 36.6+or-0.69 months. In the 1st, 2nd and 3rd lactations, 300-day milk yield averaged 2658.61+or-73.84, 2833.89+or-72.43 and 2916.94+or-86.22 kg resp., and lactation duration 305.78+or-6.56, 311.23+or-5.83 and 318.79+or-5.8 days. Year of calving significantly affected 300-day milk yield in the 1st lactation.

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