Study effect of Spotting , Origin and Parity in Milk Production and Lactation Period for Friesian Cow in Iraq

	Study effect of Spotting , Origin and Parity in Milk Production and Lactation Period for Friesian Cow in Iraq
Journal of Tikrit University For Agriculture Sciences
Article 1, Volume 13, Issue 0, 2013, Pages 148-153
Abstract
This current study includes 1166 records of milk production for 305 days ,lactation period and dry period in for period between 1999-2004.Those records belong to 278 Friesian cows in Al-Ishaki dairy cattle station , which is located about (50-55Km) north of Baghdad, this study deals with the genetic factors origin and spotting affecting milk production 305 day, lactation period, the results showed no significant effect of origin and class in spotting character 305-day milk production, nor was the origin of a significant effect on the length of lactation while spotting record significant effect (a <0.05) in the length of this season because was the longest season of milk 335.00 ± 5.46 days for white cows percentage of black 33% or less, cows, medium (33-65% Black) 334.00 ± 3.04, While found significant (<0.01) for the parity in 305-day milk production, the progress of the session increased productivity to a maximum when the productivity fourth parity (2690.27 kg), the reason is a physiologic, on the other hand there was no significant effect length of parity the lactation, It seems that the similarity of the climatic conditions in which they live cows and their as well as the similarity of feeding and adaptability management systems has led to an almost total lack of impact of spotting and origin in the production of milk and season length of Friesian cows in Iraq .
Keywords
spotting; Friesian; origin; milk production

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