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Studies on age at first calving and its relationship with weight and first lactational milk yield in crossbreds


Studies on age at first calving and its relationship with weight and first lactational milk yield in crossbreds



Indian Journal of Dairy Science 38(4): 332-334



ISSN/ISBN: 0019-5146

For 109, 109 and 93 Haryana crossbreds with 50% Holstein-Friesian (HF), Brown Swiss (BS) and Jersey breeding resp. 1st 301-day milk yield averaged 1650.7 +or- 49.39, 1328 +or- 36.84 and 1373 +or- 57 kg, weight at 1st calving 326.5 +or- 8.0, 296.3 +or- 5.0 and 264.5 +or- 4.8 kg, and age at 1st calving 1050.0 +or- 18.2, 1076.4 +or- 12.8 and 960.3 +or- 12.9 days. Sire effects on calving age were significant only for HF crosses.

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