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国内外试验研究和生产实践证明,开展经济杂交,利用杂种优势,是提高养猪生产水平、降低饲养成本的一项重要措施。1976年农林部印发的《关于加强猪种选育和改良工作的试行意见》中指出:争取在三、五年内,在有地方良种的县,应分期分批基本实
Domestic and foreign experimental research and production practice have proved that carrying out economic hybridization and utilizing heterosis is an important measure to raise the level of pig production and reduce the cost of raising pigs. In the Trial Opinions on Strengthening the Breeding and Improvement of Pig Breeds issued by the Ministry of Agriculture and Forestry in 1976, it was pointed out that: In the three to five years, in counties with local thoroughbreds, the basic realities should be divided into phases