SERUM ALKALINE PHOSPHATASE POLYMORPHISM IN CROSSBRED CATTLE OF KERALA
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Date
1995
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COLLEGE OF VETERINARY AND ANIMAL SCIENCES-MANNUTHY,THRISSUR
Abstract
The present investigation was undertaken to identify the the
biochemical polymorphism at serum alkaline phospha- tase (SAP) loci and
to study the heterogenity of SAP variation in crossbred cattle. It was
also envisaged to analyse the association of SAP variation and traits of
economic importance such as milk production and composition of milk.
One hundred and ten animals belonging to two different crosses of local
nondescript cattle viz. Crossbred Holstein Friesian (57) and Crossbred
Brown Swiss (53) were typed for SAP variance by standardising
Horizontal Polyacrylamide Gel Electrophoresis (PAGE). Two genotypes
FS and SS were determined. The highest frequency of FS genotype was in
Holstein Friesian crossbred than in Brown Swiss crossbred. The
genotype FF was absent in both the crossbreds. The highest frequency of
SS genotype was in Brown Swiss crossbred than in Holstein Friesian
crossbreds.
Two alleles namely pF and pS with two phenotypes FS and SS were
identified as SAP locus. pT allele had the frequency of 0.20 and pS allele
had the frequency of 0.80 in the pooled crossbreds. Both the Holstein
Friesian crossbreds and Brown Swiss crossbred are in genetic equilibrium
at the SAP loci. No association could be established between milk
yield (305 days) and serum alkaline phosphatase level. A non significant
negative correlation existed between milk fat percentage and SAP level
whereas a significant positive correlation existed between milk SNF
percentage and SAP level. The correlation between SAP level and milk
total solids were found to be negative and non significant in Brown Swiss
1 I i /
crossbreds whereas a non significant positive correlation existed between
the SAP level and milk total solids in Holstein Friesian crossbreds.
Animals belonging to the FS genotype are better milk producers
compared to the SS genotype. For higher fat percentages, the
performance of SS genotype was compara- tively better. The performance
of SS genotype Ls better for producing milk with more than 8.5
percentage of SNF. FS genotype performed better for producing milk
having higher percentage of total solids.
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