Qurbaani & Halaal Slaughter

Halaal status of meat products exported from Brazil

Q: As we are aware, Brazil exports meat and meat products worldwide. Even within the Arab countries, these products are exported and, according to my information, they are halaal certified. As a result, many Muslims consume these products. 

However, I have noticed that our Ulama forbid consuming them. I have some questions regarding this: 

1. What is the position of our Ulama on Brazilian chicken, regardless of the brand? 

2. Are there certain brands that are genuinely halaal? 

3. On what basis is meat exported to Muslim countries and certified as halaal? 

4. Why do our Ulama and the Arab Ulama differ on this matter?

Making intention for the person who purchased the qurbaani animal when slaughtering

Q: This year I gave my qurbaani money to the Muazzin and told him to give it to his family in Mozambique and purchase an animal for qurbaani. They purchased a goat.

My question is: In order for my qurbaani to be valid, is it necessary for the one slaughtering to make a niyyah to slaughter on my behalf?