The Relation between Genetic Polymorphism Markers and Milk Yield in Brown Swiss Cattle Imported to Slovakia

P Chrenek,J Huba,D Vasicek,J Bulla,D Peskovicova

doi:10.5713/ajas.2003.1397

Abstract

The aim of this study was to determine genotypes of four genetic markers and to investigate their association with milk production traits in Brown Swiss cattle imported to Slovakia. The bovine κ-casein, β-lactoglobulin, growth hormone and prolactin genotypes of 107 cows were identified by polymerase chain reaction. Effects all four genetic markers on milk, fat, protein and lactose yields and fat, protein and lactose percentage were estimated from a data set of 249 lactations. The frequency of desirable B allele of κ- casein gene to milk production was 0.46, alleles A of β-lactoglobulin gene was 0.55, allele and L of growth hormone gene was 0.45 and allele A and B of bovine prolactin gene were 0.61 and 0.39. The results of milk production obtained in our work showed that BB genotypes of κ-CN gene, AA genotypes of β-LG gene, LL genotypes of bGH gene were significantly associated with better milk production traits, mainly about the fat content. Association of a bovine prolactin genotypes with milk production were not found. (Asian-Aust. J. Anim. Sci. 2003. Vol 16, No. 10 : 1397-1401)

Highlights

One of the posibility to progress in dairy cattle is selection of animal with favorable genotypes of genetic markers
Swiss cattle imported to Slovakia by PCR-RFLP method and their frequency are summarized in the Table 3
The Brown Swiss cattle is a breed with many advantages (Averdunk, 1997) characterized by good milk production in mountain areas

Summary

Introduction

One of the posibility to progress in dairy cattle is selection of animal with favorable genotypes of genetic markers. The techniques allow selection of desirable genotypes to milk or meat production at an early age in both sexes. Ambiguous evidence has been reported regarding the association of κ-casein (κ-CN) and βlactoglobulin (β-LG) genotypes with milk yield and composition (Ng Kwai Hang et al, 1990, Mukhopadhyaya and Mehta, 2002). Despite these contradictory results, several reports (Lin et al, 1986, Cerbulis and Farrell, 1974). The allele B of κ-CN gene is more desirable than allele A because the former is associated with higher casein content in milk, higher cheese-yielding capacity, more favorable cheese composition and better coagulating properties in terms of rennet clotting time and curd firmness

Objectives

Methods

Results

Conclusion