关键词: 卵用鸡[49ME], 慢羽, 生产性状[49MC]

Abstract: This paper is about the distribution of different slow-feathing types and their performences of the slow-feathering pure line of white chicken layers. 1203 day-old chicks were identified and divided into four groups according to their slow feathering types:1. the primaries, shorter than primary-coverts(S1), are the highest(72.7%), the primaries, not extended out(S2), are the second(19.4%), 3. the same in length of primaries and primary-coverts is the third(6.7%) and 4. the primaryes, longer than primary-coverts within 2mm(S4), are the lowest(1%). The result from female checkens showed that the difference of growth and development from the age of day old to twenty weeks old among the four types was not obvious. In each weed, their body weight from the highest to the lowest is S4, S3, S1 and S2, but their difference does not reach the significant level. There is no significant difference either in the age of first egg and egg size among the four slow-feating types(P>0.1). The egg production in 43 weeks of age of S3 is signifieantly higher than that of the S4(P<0.1), but the diffirence in all the others is not significant(P>0.1).

Key words: EGG TYPE CHICKENS, SLOW-FEATHERING, PRODUCTION TRAITS