OPTIMIZATION OF THE AGE-SEX DISTRIBUTION OF TIBETAN SHEEP POPULATION AND THE CORRELATED SLAUGHTER PROGRAM
海北藏系绵羊种群结构及其出栏方案最优化的探讨

It is one of the most important ways of managing animal production to ocntrol the population age-sex distribution.At present, the population age-sex distribution of domestic sheep in China is not rationally controlled for economic benefit and ecological efficiency.In studying the population age-sex distribution of the Tibetan sheep,the system analysis method was used and a matrix model was set up to discuss the state of the population age-sex distribution:In this formula. AN represents the natural tendency ...