Combo photo taken on Feb. 22, 2020 shows the animals on display during the opening day of the 57th International Agriculture Fair at the Porte de Versailles exhibition center in Paris, France. The annual fair will last to March 1, 2020. (Xinhua/Gao Jing)

A pig is seen during the opening day of the 57th International Agriculture Fair at the Porte de Versailles exhibition center in Paris, France, on Feb. 22, 2020. The annual fair will last to March 1, 2020. (Xinhua/Gao Jing)

Sheep attend a contest during the opening day of the 57th International Agriculture Fair at the Porte de Versailles exhibition center in Paris, France, on Feb. 22, 2020. The annual fair will last to March 1, 2020. (Xinhua/Gao Jing)

A man lead a cow to participate in a contest during the opening day of the 57th International Agriculture Fair at the Porte de Versailles exhibition center in Paris, France, on Feb. 22, 2020. The annual fair will last to March 1, 2020. (Xinhua/Gao Jing)

A visitor touches a cow during the opening day of the 57th International Agriculture Fair at the Porte de Versailles exhibition center in Paris, France, on Feb. 22, 2020. The annual fair will last to March 1, 2020. (Xinhua/Gao Jing)

Combo photo taken on Feb. 22, 2020 shows vegetables and fruits on display during the opening day of the 57th International Agriculture Fair at the Porte de Versailles exhibition center in Paris, France. The annual fair will last to March 1, 2020. (Xinhua/Gao Jing)

A staff member introduces a rooster on display during the opening day of the 57th International Agriculture Fair at the Porte de Versailles exhibition center in Paris, France, on Feb. 22, 2020. The annual fair will last to March 1, 2020. (Xinhua/Gao Jing)

A chick during the opening day of the 57th International Agriculture Fair at the Porte de Versailles exhibition center in Paris, France. (Xinhua/Gao Jing)

Organic crops are exhibited during the opening day of the 57th International Agriculture Fair at the Porte de Versailles exhibition center in Paris, France. (Xinhua/Gao Jing)

People visit the 57th International Agriculture Fair on the opening day at the Porte de Versailles exhibition center in Paris, France. (Xinhua/Gao Jing)

A man sells sausages during the opening day of the 57th International Agriculture Fair at the Porte de Versailles exhibition center in Paris, France. (Xinhua/Gao Jing)