Selection and beak-trimming effects on behavior, cannibalism, and short-term production traits in White Leghorn pullets.

Pullets of stocks derived from the North Central Randombred White Leghorn population without selection (C) or selected (S) on family performance when kept with beaks intact in multiple-hen cages were compared. Pullets had intact, one-fourth, or one-half of the beak removed (IN, 1/4R, and 1/2R, respectively). No stock differences were detected for behavior traits or other measures during the rearing period. However, beak-trimmed pullets were more inactive and feeding behavior was depressed in 1/2R pullets 1 wk after beak trimming. At 16 wk, 1/4R pullets' beaks had regrown but 1/2R pullets' beaks continued to be shorter than IN pullets' beaks. No differences in fearfulness were found between genetic stocks or among beak length treatments early in the laying period. Deaths from beak-inflicted injuries accumulated steadily from 18 wk until the study was ended at 40 wk. Cannibalistic deaths occurred less frequently in S as compared with C pullets within each beak treatment. As the amount of beak removal increased, beak-inflicted mortality decreased. The S pullets had earlier sexual maturity, lighter egg weights, and greater hen-housed egg production and egg mass than C pullets, and 1/2R pullets had greater egg production than 1/4R and IN pullets. Genetic stock by age and beak treatment by age interactions were present for hen-housed production and egg mass, and the interactions appeared to result primarily from increased mortality from cannibalistic pecking with increased age.

[1]  J. Craig,et al.  Beak trimming effects on behavior patterns, fearfulness, feathering, and mortality among three stocks of White Leghorn pullets in cages or floor pens. , 1991, Poultry science.

[2]  J. Craig,et al.  Beak-Trimming Effects on the Behavior and Weight Gain of Floor-Reared, Egg-Strain Pullets from Three Genetic Stocks During the Rearing Period, , 1990 .

[3]  J. Craig,et al.  Research Note: Genetic Stocks of White Leghorn Type Differ in Relative Productivity When Beaks are Intact Versus Trimmed , 1989 .

[4]  I. Duncan,et al.  Behavioural consequences of partial beak amputation (beak trimming) in poultry. , 1989, British poultry science.

[5]  M. Gentle.  Beak trimming in poultry , 1986 .

[6]  K. Lee,et al.  The effect of Marek's disease vaccination and day-old debeaking on the performance of growing pullets and laying hens. , 1977, Poultry science.

[7]  R. S. Hansen.  Nervousness and hysteria of mature female chickens. , 1976, Poultry science.

[8]  G. Perry,et al.  Feather pecking and cannibalism in a caged layer flock. , 1975, British poultry science.

[9]  J. R. Carson,et al.  The Effect of Age at and Methods of Debeaking on Future Performance of White Leghorn Pullets , 1975 .

[10]  L. R. Champion,et al.  Debeaking of Caged Layers , 1965 .

[11]  S. J. Slinger,et al.  Effects of Debeaking and Feeding Whole Grain on the Reproductive Performance of Pullets , 1964 .

[12]  J. Craig,et al.  Beak trimming and genetic stock effects on behavior and mortality from cannibalism in White Leghorn-type pullets , 1990 .

[13]  M. Gentle,et al.  The effect of beak trimming on food intake, feeding behaviour and body weight in adult hens , 1982 .

[14]  W. Morgan.  Effect of Day-Old Debeaking on the Performance of Pullets , 1957 .