Final answer:
The inaccurate statement about grazing annual forages is that early-spring or fall-planted cool-season forages can provide grazing from late May to early July. The growth cycle of these forages generally allows for grazing earlier than late May or before early July, depending on the planting time.
Step-by-step explanation:
The statement that is not true about grazing annual forages is that 'Early-spring or fall-planted annual cool-season forages can provide grazing from late May to early July'. This statement does not accurately reflect the usual growth cycle of cool-season forages, which are typically planted in fall and grazed in early spring or planted in early spring and grazed in late spring to early summer. Instead, one would expect early-spring planted cool-season forages to be available earlier than late May, and fall-planted forages to be used before early July.
The phenology of annual forages dictates their growth and harvest times. For instance, wheat can be categorized as a winter annual or a spring annual, depending on planting time and its required vernalization treatment. Additionally, grazing can indeed provide a greater harvest efficiency than haying due to the direct intake by animals, and staggered plantings can be very beneficial for rotational stocking, effectively extending the grazing season for different pasture areas.