title: Removal of residual yolk at hatch influences food choice and feeding activity in lines of chickens selected for high or low juvenile body weight.
abstract: The effect of residual yolk removal at hatch on growth and feeding behavior was assessed in lines of chickens divergently selected for low (LW) or high (HW) 56-day body weight. At hatch chicks were assigned to 1 treatment: removal of the residual yolk (R) or no surgery (I). Twenty-four chicks per line (12 I and 12 R) were assigned to an all-mash regimen (M) and 48 per line (24 I and 24 R) to a choice (C) between mash and dietary residual yolk. HW were heavier than LW chicks regardless of treatment. On day 5 and thereafter, chicks given a choice were heavier than those eating mash. HW chicks ate more than LW ones. The percentage of yolk eaten increased during the 2-3 d after hatch, remained constant for 2 d, then decreased. Results are discussed in term of yolk need and development of the gastrointestinal tract in the divergent lines.
authors: INRA, Station de Recherches Avicoles, Centre de Tours-Nouzilly, France.
authors: I
authors: I
authors: Turro-Vincent
authors: Z
authors: Z
authors: Nitsan
authors: M
authors: M
authors: Picard
authors: E A
authors: EA
authors: Dunnington
authors: P B
authors: PB
authors: Siegel
mesh_terms: D000821:Animal Feed; D000818:Animals; D001522:Behavior, Animal; D001835:Body Weight; D002645:Chickens / Q000254:growth & development / Q000502:physiology*; D004044:Dietary Proteins / Q000008:administration & dosage; D004435:Eating; D004530:Egg Yolk / Q000502:physiology*; D002149:Energy Intake; D005518:Food Preferences; D009929:Organ Size
chemical_list: D004044:Dietary Proteins