WINTER BONUS MAGAZINE 2025

The environmental conditions of the rumen sacs continually fluctuate due to ruminal contractions, stratification, and the digestibility of feedstuffs. that received a grain-based diet showed signs of rumen motility at three weeks of age. We can, therefore, concl is not only a function of muscle development but that the nutrient value of the feed also plays a role. With muscularizatio of the rumen wall, we automatically get an increase in blood supply. The increased blood critical role in xygen and nutrient s pply to the muscles, but they must also absorb and transfer the nutrients fro tract to the body. The rumen has five distinct yet connected compartments that niche environments. These subregions' development is incorp development of the rumen size. They have different fermentativ on their microbial activity in these compartments. The microbe c change based on these subregions, helping to improve efficient that will impact the diversity of microbial populations inhabiting The environmental conditions of the rumen sacs continually fl ruminal contractions, stratification and the digestibility of feedst Together with the size and the muscularisation of the rumen wall, we get rumen microbial colonisation. The establishment of the rumen microbiome is critical to host metabolism, health, and immune development. The rumen is sterile before the animal is born, but the first colonisation takes place during birth, where the calve ingests the microbiota from the fluid present during natural birth. There are two important aspects when it comes to microbial colonisation: the amount of rumen microbes is dependent on the substrate available for them to feed on, and they need a watery environment. It is, therefore, important that the animal is fed creep feed of the right structure and nutrient balance and has free access to water. Without water intake, the rumen cannot develop; it is, therefore, important to make sure the animals can reach the water trough. Microbial composition shifts and gets more complex with age and development of the animal and tends to stabilise with weaning and maturity. To increase the rumen absorption surface, we need papillae proliferation. The volume of the rum n and papillae proliferation can d velop independently from one anoth r. Rumen papillae play a crucial role in nutrient absorption; particularly volatile fatty acids produced during fermentati . Wh n microbes in the rumen ferment carbohydrates, they produce mainly acetate, propionate, and butyrate, which are then absorbed through the rumen wall and used as energy sources. Volatile fatty acids (VFAs) are a primary energy source for ruminants, supplying approximately 60–80% of their total energy requirements. • Acetate(C 2 H 4 O 2 ): mainly used for energy and fat synthesis. • Propionate:(C 3 H 6 O 2 ): a key precursor for gluconeogenesis in the liver, contributing directly to glucose supply. • Butyrate (C 4 H 8 O 2 ): utilised primarily by the rumen wall and for body energy and plays a role in stimulating papillae proliferation. To get papillae proliferation, we need to increase the butyrate production by rumen microbes. The balance of VFA’s is influenced by the diet composition, butyrate is mainly produced by microbes that ferment sugars and starch. To have papillae proliferation from an early age, it is necessary to introduce creep feed. Rumen papillae can degenerate if there is not a constant supply of VFA’s produced by the rumen microbes; it is, therefore, important to keep a continuous feeding programme to grow and maintain the rumen papillae. Rumen papillae can grow in length, width, and density – this is all important to increase the surface area of the rumen wall for a larger absorption area. With a greater surface area, we decrease the risk of acidosis as there is more surface area for VFA’s to be absorbed. The growth of the papillae will also increase the thickness of the rumen wall to lower the risk of endotoxin translocation, preventing systemic inflammation and liver abscesses. Physical structure of the feed – feed must have a larger particle size and highly effective fibre to increase the physical stimulation of the rumen wall. To optimise rumen development, the following is important: Increase rumen size Winter 2025 BONUS www.agribonus.co.za 44