00747naa a2200133 a 450000100080000000500110000800800410001910000140006024500720007426000090014652003860015565000110054177300610055220786202017-11-01       1968    bl uuuu     u00u1 u    #d1 aCOHEN, P.  aRhythmic activity and monthly variation in cattle conception rates.  c1968  aAnalysis of thousands of monthly reports, based generally on 60- to 90-day non-returns, from A.I. centres in the Transvaal (South Africa), Dartington (England), Holland and north-western Washington, revealed an agreement among the monthly variations of the N.R. rates. In all 4 cases the graphs of N.R. rates go down in the early months of the year and reach their maxima near Oct.  aCattle  tThe Veterinary Recordgv. 82, n. 3, p. 74-76, Jan. 1968.