The 6th International Seminar of Animal Nutrition and Feed Science (ISAINI 2021) is an international conference that provided especially for member of Animal Nutrition and Feed Science and generally for academia, researchers, policymakers, professionals and stakeholders in the domain of interest from around the world. The conference that organized by Department of Animal Nutrition and Feed Science, Faculty of Animal Science, Universitas Gadjah Mada (UGM) in collaboration with Central Board of Animal Nutrition and Feed Science (AINI) was held on July 7-8, 2021 in UGM Yogyakarta, Indonesia. This year, the organizing committee of ISAINI 2021 has comes to the difficult decision to hold the conference online. We are making this decision after much consideration of the ongoing spread of COVID-19, striving to take the most socially responsible action while maintaining a forum in which our community can share their work, discovery, and latest research results and exchange their ideas. In addition, direct contacts among the researchers and scientists will therefore promote not only national but also international research networking as well as collaboration in the future.

The ISAINI 2021 theme is Tropical Livestock Production Systems and Animal Welfare for Sustainable Development Goals consists of ten sub theme, namely Feed and Climate Change, Animal Nutrition and Green Environment, Animal Waste and Enviromental Issues, Animal Nutrition and Feed Engineering, Biotechnology in Animal Nutrition, Functional Feed and Animal Health, Animal welfare and health, Breeding and livestock production, Poultry production and nutrition, Animal physiology and behavior, Animal product and Technology, Extension of agriculture.

The conference committee has invited six expert and competence speakers: Prof. Dr. Ismunandar Deputy of BRIN (as keynote speaker), Prof. Ali Agus from Universitas Gadjah Mada Indonesia, Ms.Marlina (General Manager of PT. Gerbang Cahaya Utama), Prof. Yutaka Uyeno from Shinshu University, Japan, Dr. Karen Harper from University of Queensland Australia, Dr. Chung Ki Yong from Korea National College of Agriculture and Fisheries, Korea.

This year, the ISAINI 2021 has received 70 submissions from 7 countries throughout the world. All submitted papers went through a rigorous peer-review process. Based on the results of the review process, 66 papers have been selected. Selected papers were compiled into the proceeding after being reviewed rigorously. This conference will not become a reality without support and assistance of many parties. In this occasion, I would like to sincerely thank the Rector of Universitas Gadjah Mada, Dean Faculty of Animal Science, Chairman of AINI, Head of Dept NMT, ISAINI officers and staffs, and also all invited speakers.

Last but not least, we also wish to thank reviewers (represent scientist from 6 different countries) for invaluable comments and suggestions and the organizing committee for arranging all needed facilities to the success of this conference. We are expecting more experts and scholars from all over the world to join the next ISAINI 2023.

Sincerely yours,
Bambang Suwignyo, PhD, ASEAN Eng.
Chairperson of the 6th ISAINI 2021