Al-Obaidi, R., Al-Janabi, H. (2025). The Relationship Between Polymorphism of The Prolactin Gene and The Production of Milk, its Components, and The Reproductive Performance of Holstein Cows. , 23(2), 1262-1270. doi: 10.32649/ajas.2025.189069
R. H. Al-Obaidi; H. R. Al-Janabi. "The Relationship Between Polymorphism of The Prolactin Gene and The Production of Milk, its Components, and The Reproductive Performance of Holstein Cows". , 23, 2, 2025, 1262-1270. doi: 10.32649/ajas.2025.189069
Al-Obaidi, R., Al-Janabi, H. (2025). 'The Relationship Between Polymorphism of The Prolactin Gene and The Production of Milk, its Components, and The Reproductive Performance of Holstein Cows', , 23(2), pp. 1262-1270. doi: 10.32649/ajas.2025.189069
Al-Obaidi, R., Al-Janabi, H. The Relationship Between Polymorphism of The Prolactin Gene and The Production of Milk, its Components, and The Reproductive Performance of Holstein Cows. , 2025; 23(2): 1262-1270. doi: 10.32649/ajas.2025.189069

The Relationship Between Polymorphism of The Prolactin Gene and The Production of Milk, its Components, and The Reproductive Performance of Holstein Cows

Anbar Journal of Agricultural Sciences
Volume 23, Issue 2, December 2025, Pages 1262-1270    PDF (493.93 K)
Document Type: Research Paper
DOI: 10.32649/ajas.2025.189069
Authors
R. H. Al-Obaidi; H. R. Al-Janabi
Department of Animal Production, College of Agricultural Engineering Sciences, University of Baghdad, Baghdad, Iraq
Abstract
The study was conducted at the Al-Khalis dairy production station in Diyala Governorate during the 2021-22 production season on 63 Holstein cows to determine the effect of polymorphism of the prolactin gene (PRL) on their milk production, its components, and their reproductive traits. The results showed that the three TT, TC, and CC genotypes had highly significant different ratios at 77.78%, 19.05%, and 3.17%, respectively. The frequency of the T and C alleles was 0.87 and 0.13, respectively. Total milk yield was significantly higher in the TC genotype at 4398.00 kg followed by the TT and CC genotypes at 3957.98 kg and 3505.00 kg, respectively. The polymorphism of PRL had a significant effect on milk composition but did not affect the reproductive traits of the cows. Therefore, the selection of hybrid individuals according to the prolactin gene will help increase milk production, and economic returns, and can thus be used for improving the genetics of dairy cows
Keywords
Genetic structure; Prolactin gene; Milk; Holstein
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