Effect of breeding chickens (gallus gallus l.) of the plymouth rock domestic meat cross “smena 9”

The article is devoted to the assessment of efficiency se-lection initial lines Plymouth Rock breed domestic meat cross “Smena 9”. It was found that breeding chickens CM7 and CM9 (from 2016 2020) resulted in an increase live weight young, fleshing chest legs at 35 days age, feed conver-sion for both cockerels hens by 8.8-10.0%; 0.9-1.9% 1.0-1.9%; 1.2-1.8%. In 2020, all juveniles paternal line one day age were carriers marker gene K (100%), maternal Cm9 - (100%). accuracy sexing parental form CM79 99.7%. From pair Smena 9 cross, 307.6 kg obtained, which 14.2% higher than previous cross. average daily gain final hybrid “Smen. 66 kg/kg; a 9” grown production conditions SGC “Smena” 63.5 g; costs 1.66 preservation rate 98.8%; output pectoral muscles slaughter yield 23.5 73.1% (against 56.3 71.4%). bird competitive.