Influence of Inbreeding on Performance Traits of Sahiwal Cattle

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Abstract
In analysis of pedigree and perform- ance records of 967 purebred Sahiwal cows and 68 bulls at Allahdad Cattle Farm, Jahanian, Multan from 1926 to 1966, a slight amount of inbreeding re- sulted due to purebreeding. The coeffi- cient of inbreeding among 325 inbred cows ranged from .2 to 33.3% with an average of 6.9 __+ .3%. The first lactation milk yield averaged 1,989 ___ 31 kg among inbred cows and was adversely affected by increased inbreeding. However, milk yield expressed as most probable produc- ing ability increased by 3.4 ___ 3.2 kg for each percent increase in inbreeding. Age at first calving and calving interval were reduced slightly by inbreeding.