Hi Nazia,
Unfortunately, I do not have information regarding costs of the fencing and maintenance. Yes of course it is okay to use information on similar fencing as a basis for comparing costs. These are reasonable assumptions that will help you move forward in your project.
One thing to consider is that the fencing is implemented to protect sacred and significant areas rather than enclose animals. I believe the cows are free-roaming.
Resource: Life on the land with the Lama Lama rangers
In response to your sensors/technology query, it is up to your team to decide whether to proceed with the design. When selecting the technology, there are a number of considerations you will need measure them up against (cost, appropriateness, maintenance). The most important thing is that you consider the appropriateness in this context and to make sure you justify your decisions.
I hope this is helpful.
Kind regards,
Evelyn
Evelyn Todio