The effect of infections at calving on production in the subsequent lactation was not examined.
An interaction between season of calving and nutrition on the resumption of ovarian cycles in post-partum beef cattle.
Similarly, calving difficulty whose determinants can be variable was not taken into account in the model.
An indicator of length of calving season was measured by the date by which approximately 75 % of calves were born.
Samples were missing at calving for 32 quarters.
The event of calving appeared to reduce the likelihood of shedding.
At 1 week post-partum, 13\52 (25 %) calves born in 1997 were shedding the organism.
The reduced levels of kairomones in calf odour accord with the finding that calves attract significantly fewer tsetse than an ox.
