Greetings dear @lemouth, in livestock many important aspects related to forage and non-forage plants should be considered, taking into account that we must consider the animal component and often the excess of some nutrient or other substance can affect its metabolism and therefore the productive performance of milk and meat.
In soils the deficit or excess of nutrients can affect the metabolism of plants, since the elements that it takes from the soil are fundamental for the process of photosynthesis, for example, in the case of pastures there are species belonging to the genus Brachiarias or also known day Urochloa, which when nitrogen fertilization is exceeded, these accumulate nitrate in their leaves which significantly affects the animal, although they need nitrogen for the proper functioning of one of the compartments of the stomach called rumen, an excess that generates other components causing ruminal acidosis, that is to say increase the ph of the rumen decreases significantly and can cause the death of the same.
Situation that can happen, also when you are supplied leguminous by them have high levels of protons in their leaves, so I must supply what is necessary and not exceed daily consumption, Apart from the some secondary metabolites that they synthesize and an excess can cause side effects such as hair fall among other pathologies.
There were also the arvenses or weeds, we must identify them for control and know how it can influence if the animal consumes it. The management of livestock system is complex, it must be managed based on the components of the system and perform appropriate agronomic management and zootechnical management (as the animal is handled on the surface), with that we manage to have healthy soils that translate into healthy plants and care for pastures and fodder with a rational management of animals achieving the sustainability of both components.
So long, have a great start to the week.
RE: Some considerations on secondary metabolites of forage species.