A farming systems study of abortion in dairy cattle on the Atherton Tableland [Queensland], 4. Pasture composition and plasma progesterone concentrations of pregnant cows in affected herds
1989
Norton, J.H. | Ivers, N. (Queensland Dept. of Primary Industries, Townsville (Australia). Oonoonba Veterinary Lab.) | Tranter, W.P. (Tableland Veterinary Service, Malanda (Australia)) | Campbell, R.S.F. (James Cook Univ., Townsville (Australia)) | Martin, P. (Queensland Dept. of Primary Industries, Yeerongpilly (Australia). Animal Research Inst.)
Pastures were sampled for dry matter, protein, nitrate and fibre content, and cows for plasma progesterone levels, on 4 farms on 5 occasions over a 7-month period. By comparison with established standards for suitability to breeding cows, dry matter levels in pasture were low and variable, while protein levels fluctuated from high to very high; plasma progesterone levels were high but declining. These data provide further support for postulated association between immature, fast-growing pasture and low conception rates with abortion.
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