| environmental constrains on post-partum ovarian activity in tanzanian zebu cows. | milk progesterone measurements were used to study post-partum ovarian activity and risk factors for ovarian dysfunction in zebu cows reared under a traditional pastoral management system in three villages in morogoro region, tanzania. milk samples for progesterone analysis were collected twice per week from a total of 98 lactations. the most prevalent ovarian dysfunction detected was delayed onset of post-partum ovarian activity and cessation of cyclical ovarian activity after a period of normal ... | 2008 | 18343492 |