SHORT-TERM EVALUATION OF PURE AND CROSSBRED PARENT STOCK PULLETS
SHORT-TERM EVALUATION OF PURE AND CROSSBRED PARENT STOCK PULLETS
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Date
1987-12
Authors
ADENOWO, JOSEPHINE ADEJOKE
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Abstract
Some traits of economic importance in egg
production were studied in eight F1. genotypes of two
grand parent strains. The grand parent stock, each of two
lines, were imported as day-old chicks from England.
Diallel crossing was used among the two strains at
28 weeks of age to generate four F1 progeny groups per
line. The F1 chicks were brooded and reared like the
grand-parents on deep-litter pens. Laying pens were also
deep litter.
The results showed that the genotypes of both lines
responded differently in production characteristics. Age
at first egg was generally sire influenced but the
inheritance of body weight and egg weight was line
dependent. Pullets of male line were lighter at 30 weeks,
laid more and heavier eggs and consumed more feed than
those of female line.
General combining ability was important for weight
of first egg and feed consumption while specific combining
ability was important for laying house mortality alone.
Heterosis was important for body weight at first egg,
weight of first egg, Hen-day egg production, feed
consumption, feed efficiency and laying house mortality;
and were mostly exhibited by crossbred groups of male line.
Reciprocal effect was important for the body weight traits,
weight of first egg and laying house mortality.
Sex-linkage was suspected to be more important than
maternal effect in the present study
Description
A THESIS
SUBMITTED TO THE POSTGRADUATE SCHOOL
AHMADU BELLO UNIVERSITY, ZARIA
IN PARTIAL FULFILLMENT FOR THE DEGREE OF
MASTER OF SCIENCE
DEPARTMENT OF ANIMAL SCIENCE,
DECEMBER, 1987
Keywords
EVALUATION,, SHORT-TERM,, CROSSBRED,, PARENT STOCK PULLETS