After a fantastic back end to the grazing season, the focus of farmers has increasingly turned towards nutrition levels from winter forage.
Hopefully for many herds, and where silage stocks are tight, the last number of weeks will have alleviated some pressure from the feed budget. However, it is still worth knowing what reserve is available for next spring.
The aim over the winter period will ultimately depend on the animal type, whereby youngstock/dry cows will be stored/maintained over the winter (target Average daily gain of 0.5-0.7 kg/hd/day youngstock). Cashflow animals will also be targeted to achieve optimum performance, be it winter milk herds or finishing cattle.
However, you cannot manage what isn’t measured, and the same applies in terms of what quality silage is available to you in the yard.
Silage analysis results will often signal the level of fermentation that occurred which can be used to predict the stability of the pit and therefore dictate feed-out management. However, the importance of completing forage analysis hinges around allowing farmers to make informed decisions regarding feed plans dependant on stock type.
For dry cows, silage analysis will also dictate feed plans:
| Silage DMD% | BCS 2.75
8-10 weeks dry |
BCS ˃ 3.0
˂ 8 weeks dry |
| ˃72 % | Silage ad lib | Silage Restricted/diluted |
| 68-72 % | Silage + 1 kg | Silage ad lib |
| 64-68 % | Silage + 2 kg | Silage + 1 kg |
Replacement heifers
Weanlings/replacement heifers should be offered the national average of 67% DMD well-preserved grass silage, while underweight heifers will typically require 1.5-2kg of concentrates/head/day. This can be reduced by 1 kg/day (0.5-1 kg/head/day) if silage digestibility is 5% higher or where heifers are at or above target weight.
For example, on target heifers (grass silage quality of ~ 70% DMD) require supplementation of 0.5 – 1 kg of concentrates. Early turnout for the lightest heifers in the herd will them help gain lost ground next spring. However, this should not represent the sole contingency plan with under-target replacements.
Separate heifers should be housed and fed in separate groups according to the requirements needed to achieve their target weight at breeding. The target at housing is 40% of mature body weight and 50% in early February when turned out to grass.
For more advice, contact your local Sales Advisor here.