אסיף מאגר המחקר החקלאי

Removal of residual yolk at hatch influences food choice and feeding activity in lines of chickens selected for high or low juvenile body weight.

Year:

1994

Source of publication :

Authors :

Volume :

34

Co-Authors:

Turro-Vincent, I., INRA, Station de Recherches Avicoles, Centre de Tours-Nouzilly, France.
Nitsan, Z., INRA, Station de Recherches Avicoles, Centre de Tours-Nouzilly, France.
Picard, M., INRA, Station de Recherches Avicoles, Centre de Tours-Nouzilly, France.
Dunnington, E.A., INRA, Station de Recherches Avicoles, Centre de Tours-Nouzilly, France.
Siegel, P.B., INRA, Station de Recherches Avicoles, Centre de Tours-Nouzilly, France.

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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.

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