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The Development and Use of Chicken Inbreds

1946; Elsevier BV; Volume: 25; Issue: 3 Linguagem: Inglês

10.3382/ps.0250262

1525-3171

Charles W. Knox,

Genetic and phenotypic traits in livestock

Abstract INTRODUCTION AS a general thesis continued inbreeding increases the homozygosity of the gene complement. This was adequately demonstrated statistically by Wright (1922 and 1923). The reason for inbreeding is to produce purity (homozygousness) in a large number of factors with little or no knowledge of their particular mode of inheritance. The purpose of inbreeding is to obtain successful lines of inbreds and to demonstrate their superior economic possibilities in respect to incrossing, incrossbreeding and topincrossing. A committee of the American Society of Animal Production (1941) defines these terms as follows. Incrossing is considered as the crossing of two different inbred lines of the same breed and variety, incrossbreds the result of crossing two lines of inbreds of different breed and variety and topincross the crossing of inbred males on outbred or relatively slightly inbred females of the same breed and variety. The first part of this paper deals with the . . .