ملخص البحث :
The use of gene markers in livestock breeding plays a crucial role in enhancing productivity. Specific genetic
markers can be identified, facilitating the task of breeders in selecting desired traits, such as milk production, disease
resistance, and growth monitoring, which in turn leads to improving the overall productivity of animals. This research
aims to study the linkage among the genetic marker DIK20 and several physiological and productive features in
Holstein cattles, which includes milk production, mastitis, and percentages of fat, lactose, and protein. The research
was conducted in one milk production season, starting from October 2022 to April 2023, using 60 Holstein cows aged
between 4-6 years. The results showed that cows had two genotypes of DIK20, with sizes of 190/181 and 180/170 base
pairs, with distribution rates of 36.21 and 63.79%, respectively. Results obzerved highly significant differences (P≤0.01)
between the genetic variants. The study also found significant differences (P≤0.05) between the genetic polymorphisms
180/170 and 190/181 in the California mastitis test. However, no statistically significant differences noticed in the
genetic polymorphisms related to fat, protein, lactose, and solid non-fat in milk elements, with percentages of 3.60%
and 3.48% for fat, 2.90% and 3.1% for protein, 4.18% and 4.31% for lactose, and 7.94% and 8.26% for solid non-fat for
the two genetic polymorphisms 180/170 and 190/181, respectively. It is concluded that there is a correlation between
the genetic marker DIK20 and various physiological and productive traits in Holstein cows.
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سنة النشر : 2024
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تصنيف البحث : scopus
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