Genetic and Phenotypic Trends for Milk Yield per Lactation in Sahiwal Cattle under Arid and Semi Arid Conditions of Pakistan

RESEARCH ARTICLE Genetic and Phenotypic Trends for Milk Yield per Lactation in Sahiwal Cattle under Arid and Semi Arid Conditions of Pakistan Asghar Hussain , Javed Iqbal, Muhammad Shafiq, Pervez Akhtar, Abdul Shakoor and Usman Waheed Sub Campus-Jhang, Universi ty of Veter inary and Animal Sciences, Lahore, Pakistan Research Centre for Conservat ion of Sahiwal Cat t le , Jhang, Pakistan Depar tment of Animal Breeding & Genetics , Univers i ty of Agricul ture, Faisalabad, Pakis tan