Purpose of this study was to examine leptin (LEP) and pituitary-specific transcription factor-1 (Pit-I) gene polymorphisms in Holstein cattle (n=352) in Turkey. In order to determine the Pit-I-HinfI and LEP-Sau3AI polymorphisms, polymerase chain reaction and restriction fragment length polymorphism (PCR-RFLP) were performed. A 600 bp length fragment of Pit-I and a 422 bp length fragment of LEP were amplified. In this study, two types of alleles, A and B, for both of the Pit-I and LEP genes were observed. The highest frequencies of the alleles were estimated, and were the B allele (0.68) for the Pit-I gene and the A allele (0.87) for the LEP gene. According to the results of the chi-square test, a significant deviation from the Hardy-Weinberg equilibrium was determined for both of these genes in the investigated breed (in the same order; X 2 :40.75, p<0.001and X 2 :8.4, p<0.01). Türkiye'de yetiştirilen Holştayn sığırlarda hipofiz bezine özgü transkripsiyon faktörü-1 (PIT-1) ve leptin (LEP) gen polimorfizmlerinin belirlenmesiÖzet: Bu çalışmada Türkiye'de Kayseri civarında yetiştirilen Holştayn ırkı sığırlarda (n=352) leptin (LEP) ve hipofiz bezine özgü transkripsiyon faktörü -1 (Pit-I) genlerinin polimorfizmlerinin belirlenmesi amaçlanmıştır. Pit-I-HinfI ve LEP-Sau3AI polimorfizmlerinin belirlenmesi amacı ile polimeraz zincir reaksiyonu (PZR) ve restriksiyon parça uzunluk polimorfizm (RFLP) analizi yapılmıştır. Pit-1 geni için 600 bç'lik ve LEP geni için 422 bç'lik uzunluk amplifiye edilmiştir. Çalışmada, Pit-1 ve LEP geni allellerinin her ikisinde de A ve B allelleri olmak üzere iki iki tip allel gözlendi. En yüksek frekans Pit-1 geni için A allelinde (0.87), LEP geni için ise B allelinde (0.68) olarak belirlendi. Ki-kare test sonuçlarına gore, incelenen ırkta, her iki gende de Hardy-Weinberg dengesinden anlamlı bir sapma gözlendi (aynı sıra ile; X 2 :40.75, p<0.001ve X 2 :8.4, p<0.01).

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SummaryThe purpose of this study was to examine the kappa-casein (κ-CN), growth hormone (bGH) and prolactin hormone (PRL) gene polymorphisms in the Holstein (n=150), Simmental (n=50) and Brown Swiss (n=50) cattle breeds in Turkey. In order to determine the κ-CNHindIII, PRL-RsaI and bGH-AluI polymorphisms, polymerase chain reaction and restriction fragment length polymorphism (PCR-RFLP) were performed. A 443 bp fragment of κ-CN, a 223 bp fragment of bGH and a 156 bp fragment of PRL were amplified. In this study, two types of alleles, A and B for κ-CN, V and L for bGH, and A and B for PRL, were observed. The cattle breeds in which the highest frequencies of the alleles were estimated, were the HL breed (0.82) for κ-CN-A, the BS breed (0.55) for κ-CN-B, the HL breed (0.85) for bGH-L, the S breed (0.34) for bGH-V, the HL breed (0.87) for PRL-A, and the BS breed (0.24) for PRL-B. According to the results of the chi-square test, a significant deviation from the Hardy-Weinberg equilibrium was determined only for the bGH locus in the investigated breeds. The present study is the first report that examines three loci (κ-CN, bGH and PRL) in three cattle breeds of European origin (Holstein, Simmental and Brown Swiss) raised in Turkey.

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