E.O. Amasaib  , A.M. Abu Nikhaila  , A.N.M.A. Fadel Elseed  , H.E. Mohamed  , 
    Effect of Season of Calving and Parity on Some Productive Traits in Pure and Crossbred Cattle in Sudan,
    Research Journal of Dairy Sciences,
    Volume 2,Issue 1,
    2008,
    Pages 5-8,
    ISSN 1993-5277,
    rjdsci.2008.5.8,
    (https://makhillpublications.co/view-article.php?doi=rjdsci.2008.5.8)
    Abstract: This study was conducted to compare some productive traits (overall milk yield; 100 days milk yield; lactation length) and the effect of season of calving and parity number on imported versus locally bred and cross bred (50, 56.5 and 62.5%) in 2 different farms in Khartoum, Sudan. The results indicated a highly significant effect of breed in terms of 100 days milk yield; however, season of calving and parity showed insignificant effect in both farms examined. The lactation length impact on 100 days milk yield is significant at p< 0.01 between purebred and cross ones.
    Keywords: Season;calving;parity;cattle;Sudan