１９８８～１９９１年，通过在西吉县绵羊改良区选择具有代表性的５６个绵羊饲养户，采取扩大畜群规模、调控畜群结构、确定适宜出栏期、加快畜群周转等系列组......

Breeding record is an important way to implement standardized sheep raising,trace major sheep raising epidemic informati......