Fig. 2From: Direct and correlated responses to selection for autumn lambing in sheepAnnual changes in day length at Blacksburg, Virginia, USA (37.2° N, 80.4° W). Arrows show the beginning and end of the joining period for selection (S), environmental control (EC), and genetic control (CG; red arrows) lines. Tan and blue arrows indicate the primary and clean-up (CU) joinings, respectively for S and EC ewesBack to article page