Spring is a high-risk period for rumen stability because pasture growth is rapid and highly fermentable - creating conditions where rumen pH can drop faster than the cow's natural buffers can respond.
Fertility is closely linked to rumen health, and when rumen pH becomes unstable, fertility can decline due to reduced nutrient supply, inflammation and disrupted reproductive hormones.
The rumen is where microbes convert feed into volatile fatty acids (VFAs) - the cow's main source of energy.
The cow and the microbes work together: chewing breaks open feed for microbial digestion, and effective dietary fibre stimulates rumination, promoting saliva production, while rumen contractions move VFAs to the rumen wall for absorption.
This process supports efficient digestion and feed-to-energy conversion, while maintaining rumen health.
Lush spring pasture can support great production, but without supporting rumen function, much of that feed potential can be lost through reduced feed efficiency and rumen instability.
Spring pasture is rapidly fermentable: microbes quickly convert the carbohydrates into large amounts of VFAs, lowering rumen pH.
When VFAs accumulate faster than they can be absorbed or neutralised by natural buffers such as saliva, cows are at risk of subacute ruminal acidosis (SARA).
Repeated periods of low rumen pH can reduce nutrient supply, reduce production (particularly milk fat), increase inflammation and disrupt reproductive hormones - ultimately affecting cycling, egg quality, conception rates, embryo survival and pregnancy maintenance.
Many of these early signs are hard to pick up by eye, particularly across a large herd at pasture.
CowManager's ear sensor monitors eating and rumination for each cow, hour by hour, against her own normal and her group.
Group alerts show the impact of a new paddock, supplement change or shift in pasture quality, and many farmers find certain paddocks consistently reduce rumination.
Individual health alerts identify cows to check ahead of mating. Vets can access the farm's data at no cost, so everyone works from the same information.
Supporting rumen health through periods of lush pasture growth can include:
- Monitoring key performance indicators such as fat-to-protein ratio, rumination minutes, dry matter intake, cycling activity and conception performance
- Observing manure consistency
- Testing pasture or forages to ensure adequate physically effective fibre is offered to stimulate rumination and saliva production
- Using feed additives like rumen buffers or live yeast, which can help stabilise rumen pH
- Maintaining consistent feeding routines, including supplement feed and pasture allocation (allowing for rapidly changing covers and dry matter percentage)
- Avoiding sudden increases in rapidly fermentable carbohydrates
Freshly calved cows trying to cycle and get to peak milk face a significant risk of rumen upset during spring. Supporting rumen stability while grazing lush pasture is key for efficient feed-to-energy conversion, cow health, production and reproductive success.
Talk to your local CowManager representative to see how they can help you maximise your herds performance by visting cowmanager.co.nz
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