Document Type : Articles
Authors
1 Biotechnology department, Applied Science Faculty, University of Samarra, Samarra, Iraq
2 Animal production, Agriculture Faculty, Tikrit university, Tikrit , Iraq
3 Office of agriculture researches / ministry of agriculture
Abstract
This study aims to detection polymorphism of β-lactoglobulin (β-LG) and its impact the yield of milk and chemical composition of Iraqi goats. in this project 75 local goats were taken with age (1.5-5.5 years), period of this study obtaining from 31-1-2023 for 28-5-2024, genotyping of this group by PCR-SSCP then sequencing for diagnostic the variation, genotyping and allelic frequency by PopGene32 software, milk samples taken in morning, analyzing by milk analyzer. Result show we have two allele T and A were 0.81, 0.19 respectively, whereas for genotypes frequency, TT and TA were 0.61, 0.39 respectively. χ2 calculated higher than χ2 standard, in average daily milk yield (ADMY) and total milk yield (TMY) there is a significant with TT vs TA, 0.872, 0.809 g/day, 119.84, 111.16 kg/day respectively, whereas milk composition there are a significant difference between genotypes, TA vs TT in lactose and solid nonfat 4.84, 4.44 and 8.72, 8.20 respectively. A difference between genotyping in ADM, TMY, LAC and SNF was observed so can be used a genetic marker in improvement programs that uses in goats breeding and farm animals.
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