Mid - late lactation
Energy requirement is less demanding during this period mainly due to lower milk production.
With that being said, sufficient energy is still important for pregnancy and to build up body condition score for next lactation cycle.
It is generally a better idea to improve the condition of the herd during late lactation period rather than dry period.
Dry period
During this period, it is crucial to maintain or increase the body condition of your herd to make sure there is enough energy for early lactation.
If the cow calve with sufficient body reserves, they can cycle within 2 - 3 months after calving.
However, if cow calve with poor body reserves, milk production with greatly reduced due to insufficient energy.
Dietary energy can be channelled towards weight gain rather than made available from desired weight loss.
Hence, high feeding levels during early lactation cannot make up for poor body condition during calving.