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The data on 3434 records for lactation milk yield and lactation length and 2314 records for dry period of Sahiwal cows maintained at the Livestock Experiment Station (LES), Bahadurnagar, Okara, Pakistan and its Patadars during 1986-2000 were analyzed by least square analysis of variance techniques, using the LSMLMW computer programme. The population means for lactation milk yield, lactation length and dry period were 1547 ± 36.69 kg, 268 ± 4.53 days and 214 ± 16.64 days, respectively. The milk yield averaged 1617 ± 35.09 kg at LES and 1477 ± 43.54 kg at Patadar’s herds of Bahadurnagar. The effects of herd and year of calving on milk yield were highly significant (P |
