Analysis of data on first lactation of Bos indicus, Bos taurus and their halfbreds indicated that Holstein x Tharparkar halfbreds calved earliest in first and second calvings (825.32±85.43 and 1245.37±91.46 days, respectively). These halfbreds were best for 305 days first lactation milk yield (2960.75±241.87 kg); first dry period (99.09±29.19 days); milk yield per day of - first lactation length (9.58±0.71 kg), first calving interval (7.61±0.72 kg); age at second calving (2.38±0.26 kg); lactation efficiency (79.86±4.80 percent) and breeding efficiency (99.56±5.65 percent). Purebred Holstein cattle were on the second place with respect to almost all the traits considered for Holstein x Tharparkar halfbreds, except first dry period for which Hariana halfbreds with Jersey/Holstein were on the second place. Total first lactation milk yield and peak yield in first lactation were highest in Holstein cattle (3194.71±124.12 kg and 15.10±0.45 kg, respectively). Genetic group effect was highly significant (P<0.01) on all the traits. Season of calving influenced (P<0.05) age at first calving, only. Effect of period of calving was highly significant (P<0.01) on ages at first/second calving and breeding efficiency, whereas it significantly (P<0.05) affected first lactation 305 days milk yield and peak yield.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 25: Lactation; growth and efficiency; meat quality; role of exotic breeds in the tropics; design of village breeding programs; n, , 209–212, 1998
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