EVALUATION OF THE DAIRY POTENTIAL OF BUNAJI AND BOKOLOJI BREEDS
EVALUATION OF THE DAIRY POTENTIAL OF BUNAJI AND BOKOLOJI BREEDS
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Date
1987
Authors
ADEMOLA, OLATUNDE JOHNSON
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Abstract
The Study herein reported involves the evaluation of the
dairy potential of Bunaji, Bokoloji (Sokoto Gudali) breeds on
dairy productive traits in which a total of 3105 records of
761 cows over a period of 24 years were used. The records
on birth weight were 3647 for the two breeds. The investigation
also included the study on the environmental factors influencing
dairy traits and the genetic estimates of the dairy traits.
Results showed that for both breeds, the Chi-squares
comparison showed significant differences for both first and
all calvings between year and (P<.0.05).
The recorded age at first calving were 45.7 months and
46.7 months for Bunaji and Sokoto Gudali breeds. The Calving
interval recorded for bunaji and Sokoto Gudali breeds were
13.46 months and 13.45 months.
For the 305-day milk yield results showed that whereas
the effects of breed was not significant (P>0.05), the
effects of year or month of calving as well as parity were
all significant (P<0.001). The average milk yield for all
lactations were 1039 kg and 1055 kg for Bunaji and Sokoto
Gudali breeds.
Regarding lactation length, results showed non-significance
(P>0.05) for effects of breed, but the effects of year and
parity were very highly significant (P<0.001). and the effects
of month of calving was also highly significant (P<0.003).
The lactation length recorded was 239.2 days and 236.2 days
for Bunaji ana sokoto Gudali breeds respectively.
The heritability estimates for age at first calving,
calving interval, lactation length, milk yield per day dry
period, all lactation milk yield and birth weight varied
from 12 to 0.40 and 0.12 to 0.31 respectively for Bunaji and
Sokoto Gudali breeds.
The estimates of genetic progress revealed that the
genetic improvement of 0.9% and 0.5% per year were obtained
respectively for Bunaji and Sokoto Gudali breeds.
Selection for improvement in milk yield indirectly
through selection for lactation length showed the least loss
in accuracy when selection is made for the top 5% as
compared with the top 25% of the cow population
Description
A Dissertation
Submitted to the Postgraduate School
Ahmadu Bello University
In partial fulfillment of the requirements
for the degree of
DOCTOR OF PHILOSOPHY
Department of Animal Science
Ahmadu Bello University
Zaria
1987
Keywords
EVALUATION,, DAIRY POTENTIAL,, BUNAJI,, BOKOLOJI BREEDS