Research Article

Assessment of ANXA9 SNP effects on milk performance traits in Polish Holstein-Friesian cows

Hanna Kulig 1 , Katarzyna Wojdak-Maksymiec 1, Małgorzata Szewczuk 2

1Department of Genetics, West Pomeranian University of Technology in Szczecin, Aleja Piastów 45, 70-311 Szczecin, Poland

2Department of Ruminant Science, West Pomeranian University of Technology in Szczecin, Klemensa Janickiego 29, 71-270 Szczecin, Poland

Abstract. The aim of this study was to estimate associations between the ANXA9 951A/G polymorphism and milk performance traits (daily milk yield, protein yield, fat yield, protein content and fat content), as well as somatic cell count in milk in 990 Polish Holstein-Friesian cows. The statistical analysis confirmed its significance in shaping the analyzed traits. In most cases, the presence of the allele A was associated with a decrease in the values of the above traits, while in the first lactation a significant additive effect of this allele toward increasing the values of the daily milk yield and SCC was found.

Keywords: ANXA9 SNP, additive and dominance effects, cattle, milk performance

INTRODUCTION

Annexin A9 (ANXA9) is the protein associated with the cytoplasmic membrane. It belongs to a family of proteins that bind phospholipids in Ca+2 dependent way [Moss and Morgan 2004Moss, S.E., Morgan, R.O., (2004). The annexins. Genome Biol., 5(4), 219. https://doi.org/10.1186/gb-2004-5-4-219]. Annexins have different functions in the cell. They are involved in the signal processing, endocytosis, membrane trafficking, calcium channel formation, and regulation of the inflammatory response in the cell cycle. ANXA9, whose activity is not regulated by Ca+2, is considered to be a specific protein in this family. The expression of the ANXA9 gene was demonstrated in various tissues, particularly in those which are characterized by rapid metabolism of fatty acids, such as mammary tissue during lactation [Calvo et al. 2006Calvo, J.H., Martínez-Royo, A., Silveri, L., Floriot, S., Eggen, A., Marcos-Carcavilla, A., Serrano M. (2006). Isolation, mapping and identification of SNPs for four genes (ACP6, CGN, ANXA9, SLC27A3) from a bovine QTL region on BTA3, Cytogenet. Genome Res., 114, 39–43. https://doi.org/10.1159/000091926].

The gene encoding the ANXA9 was mapped on the bovine chromosome 3. As a result of different studies, QTLs for some milk performance traits were mapped on the bovine chromosome 3. Moreover, a QTL region with effect on fat yield, in which ANXA9 gene is located has been found [Ashwell et al. 2004Ashwell, M.S., Heyen, D.W., Sonstegard, T.S., Van Tassell, C.P., Da Y., Van Raden, P.M., Ron, M., Weller, J.I., Lewin, H.A., (2004). Detection of quantitative trait loci affecting milk production, health, and reproductive traits in Holstein cattle. J. Dairy Sci., 87(2), 468–75. https://doi.org/10.3168/jds.S0022-0302(04)73186-0, Calvo et al. 2006Calvo, J.H., Martínez-Royo, A., Silveri, L., Floriot, S., Eggen, A., Marcos-Carcavilla, A., Serrano M. (2006). Isolation, mapping and identification of SNPs for four genes (ACP6, CGN, ANXA9, SLC27A3) from a bovine QTL region on BTA3, Cytogenet. Genome Res., 114, 39–43. https://doi.org/10.1159/000091926, Ogorevc et al. 2009Ogorevc, J., Kunej, T., Razpet, A., Dovc, P., (2009). Database of cattle candidate genes and genetic markers for milk production and mastitis. Anim. Genet., 40, 832–851. https://doi.org/10.1111/j.1365-2052.2009.01921.x]. Polymorphic sites within the coding and noncoding sequences were also identified [Calvo et al. 2006Calvo, J.H., Martínez-Royo, A., Silveri, L., Floriot, S., Eggen, A., Marcos-Carcavilla, A., Serrano M. (2006). Isolation, mapping and identification of SNPs for four genes (ACP6, CGN, ANXA9, SLC27A3) from a bovine QTL region on BTA3, Cytogenet. Genome Res., 114, 39–43. https://doi.org/10.1159/000091926]. However, the results of the analyses on the relationship between polymorphism in this gene and milk traits are scarce.

The biological role of the protein encoded by the discussed gene, the presence of transcripts in the mammary gland, as well as chromosomal location indicate its validity as candidate gene for traits related to milk performance in dairy cattle. In order to verify the potential of existing knowledge base on the subject and to further complement it, the studies involving the following were undertaken: determining the frequencies of alleles and genotypes of SNP located in the gene encoding the ANXA9 in herd of cows belonging to Polish Holstein-Friesian breed; to establish if there are any statistically significant associations between the ANXA9 polymorphism and milk performance traits (milk yield, protein yield, fat yield, protein content and fat content), as well as somatic cell count in milk in the population of cows under study.

MATERIAL AND METHODS

Material

The study was conducted in a herd of 990 Polish Holstein-Friesian cows kept on a farm located in the north-western region of Poland. All animals lived under similar environmental conditions. They were kept in one free-stall barn and milked twice a day in a herringbone-type milking parlour. The cows had ad libitum access to water from individual automatic drinking vessels and were fed an identical standard TMR (total mixed ration) diet. Additionally, during milking each cow was given specially selected feed concentrate suited to its current physiological condition and milk yield. The cows were of different ages and different lactations (from first to sixth).

The cows were covered under a milk performance monitoring system based on the A4 milk recording method and the data on their pedigree background and milk performance was collected in the SYMLEK animal recording system. The data concerning milk production traits was derived from the results of monthly test milkings. A total of 39,470 test milkings were performed. The cows were daughters of 307 different bulls, the average number of daughters per one bull being 3.23. The cows were characterized by different participation of Holstein-Friesian genes, varying from 37.5% to 100%.

Genotyping

Blood samples were taken from the external jugular vein and then placed in tubes containing K3EDTA. Genomic DNA was obtained using MasterPureTM DNA Purification Kit for Blood (Symbios) in accordance with the attached instructions. The DNA samples suspended in TE buffer (10 mM Tris-HCl, 0.1 mM EDTA) were stored at 4 degrees Celsius.

The study covered the 951A/G polymorphic site located within the ANXA9 gene coding sequences. It results in the H84R substitution at the polypeptide level [Martínez-Royo et al. 2010Martínez-Royo, A., Ordovas, L., Zaragoza, P., Altarriba, J., Serrano, M., Rodellar, C., Calvo, J.H. (2010). The bovine annexin 9 gene (ANXA9) is significantly associated with milk-fat yield in a Spanish Holstein-Friesian population. Res. Vet. Sci., 88, 452–455. https://doi.org/10.1016/j.rvsc.2009.12.009].

Genotypes were determined based on the method available in the literature, although some modifications were made to optimize the procedures. To amplify the desired fragment of the ANXA9 (241 base pair), the following primers were used: 5′–TCC CAG ACC TTG TCA TTT CC–3′ and 5′–CTC CTG GGA ATC AGT GTG GT–3′. Primers were designed based on the sequence available in GeneBank at the AY785287 accession number and by using the Primer–3 (v. 0.4.0) software tool [Calvo et al. 2006Calvo, J.H., Martínez-Royo, A., Silveri, L., Floriot, S., Eggen, A., Marcos-Carcavilla, A., Serrano M. (2006). Isolation, mapping and identification of SNPs for four genes (ACP6, CGN, ANXA9, SLC27A3) from a bovine QTL region on BTA3, Cytogenet. Genome Res., 114, 39–43. https://doi.org/10.1159/000091926].

The PCR proceeded in a total volume of 20 µL mixture with the following composition: approximately 60–70 ng DNA, 15 pmol of each primer, 0.5 mM dNTP, 4 mM MgCl2, Taq buffer and 0.4 U of Taq polymerase (A\&A Biotechnology). The PCR thermal conditions were as follows: the initial denaturation for 3 minutes at 95°C; then denaturation step for 45 s at 94°C, annealing step for 45 s at 55°C, elongation step for 45 s at 72°C (30 cycles); then a final elongation step for 5 minutes at 72°C.

The PCR products were digested using the NlaIII endonuclease, then the restriction fragments were separated on 2% agarose gels with ethidium bromide. The results were read using the photodocumentation of electrophoretic separation, and image storage system (Vilber Lourmat®).

Statistical methods

The results were recorded and analyzed statistically to examine the genetic structure of the population under study, i.e. to determine allele and genotype frequencies for the ANXA9 gene polymorphism. Subsequently, a statistical analysis was conducted to search for associations between the polymorphism and daily milk yield and also protein, fat, SCC content in milk. SCC was transformed logarithmically to normalize the distribution of this trait. The calculations were made separately for lactations I to VI (lactation VI also including subsequent lactations, if any).

To estimate any such associations, a mixed model (containing both random and fixed effects) was applied. Apart from genotype, the following factors were included as sources of variation: standard factors such as test day, birth year/season and day in milk (DIM), and the additive polygenic effect (genetic background effect). Additionally, because studied traits are repeatable over time, the model also included fixed environmental effect. The adopted statistical model also included the dominant effect, as estimated with the natural and orthogonal interactions NOIA model [Alvarez-Castro and Carlborg 2007Alvarez-Castro, J.M., Carlborg, O. (2007). A unified model for functional and statistical epistasis and its application in quantitative trait Loci analysis. Genetics, 176(2), 1151–67. https://doi.org/10.1534/genetics.106.067348]. To estimate the genetic effects of the examined locus, single-trait mixed multiple regression models were used. The overall formula for the selected models was as follows: $$ Y_{jklmn} = \mu + G_j + TD_k + YS_l +DIM_m +A_n + PE + e_{jklmn} $$ where:

    \( Y_{jklmn} \) – daily milk yield or fat yield or fat content or protein yield or protein content or somatic cell count (lnSCC) of cow with j-th genotype in k-th class of milking test year/month, l-th year/season of birth class, m-th day in milk and n-th father group;

    \( \mu \) – mean value of the analyzed trait in the population;

    \( G_j \) – additive (add) and dominance (dom) effects of ANXA9 gene;

    \( DT_k \) – effect of k-th class of milking test year/month;

    \( YS_l \) – effect of l-th birth year/season class;

    \( DIM_m \) – effect of m-th DIM (day in milk);

    \( A_n \) – random additive polygenic effect of n-th father group;

    \( PE \) – random permanent environmental effect;

    \( e_{jklmn} \) – random residual effect of cow with j-th genotype in k-th year/month of milking test, l-th year/season of birth, m-th day in milk and n-th father group.

RESULTS

The frequencies of the analyzed ANXA9 951A/G alleles and genotypes are presented in the Table 1. Within the cows’ herd the AA genotype was the most frequent. Population was in Hardy-Weinberg equilibrium.

Table 1. Observed (N obs) and expected (N exp) numbers of ANXA9 genotypes and frequency of genotypes and alleles
Tabela 1. Obserwowana (N obs) i przewidywana (N exp) liczebność genotypów ANXA9 oraz frekwencja genotypów i alleli

Genotype
Genotyp

N obs

N exp

obs-exp

(obs-exp)2

Frequency
Frekwencja

Allele
Allel

Frequency
Frekwencja

AG

384

410.150

–26.150

1.667

38.788

A

70.707

AA

508

494.901

13.099

0.347

51.313

G

29.293

GG

98

84.949

13.051

2.005

9.899



Sum – Suma

990

990.000

0.000

4.019

100.000


100.000

chi-square (χ2)= 4.018797, df = 2, P = 0.134071 – population in Hardy-Weinberg equilibrium.
chi-square (χ2)= 4,018797, df = 2, P = 0.134071 – populacja w równowadze Hardy’ego-Weinberga.

Table 2 presents the estimated additive and dominant effects of the allele A in relation to milk performance traits of the analyzed cow herd. This gene has been involved in shaping daily milk yield, fat yield, fat content, protein yield, protein content and SCC in milk. In most cases, the presence of the allele A was associated with a decrease in the values of the above traits.

Table 2. Additive and dominance effects of ANXA9 gene (allele A) in relation to milk production traits in the herd under study
Tabela 2. Efekty addytywne i dominacyjne genu ANXA9 (allel A) w odniesieniu do cech użytkowości mlecznej w badanym stadzie

Lacta­tion
Kolejna laktacja

Factor
Czynnik

Daily milk yield, kg
Dobowa wydajność mleka, kg

Fat yield, kg
Wydajność tłuszczu, kg

Fat content, %
Zawartość tłuszczu, %

Protein yield, kg
Wydajność białka,
kg

Protein content, %
Zawartość białka,
%

Somatic cell count, ln(SCC/ml)
Liczba komórek somatycznych ln(SCC/ml)

Effect
Efekt

SE

Effect
Efekt

SE

Effect
Efekt

SE

Effect
Efekt

SE

Effect
Efekt

SE

Effect
Efekt

SE

I

Intercept
wyraz wolny

33.492

0.763

1.190

0.033

3.521

0.085

1.162

0.215

3.123

0.042

4.830

0.151

ANXA9 add

0.723**

0.244

0.009

0.010

–0.064*

0.027

0.016

0.069

–0.025

0.013

0.105*

0.048

ANXA9 dom

0.920**

0.327

0.018

0.014

–0.068

0.036

0.025

0.092

–0.025

0.018

0.055

0.064

II

Intercept
wyraz wolny

46.922

0.534

1.767

0.025

3.689

0.056

1.513

0.018

3.137

0.025

4.555

0.092

ANXA9 add

0.133

0.294

–0.047**

0.014

–0.168**

0.031

–0.011

0.010

–0.053**

0.014

–0.109*

0.050

ANXA9 dom

0.445

0.393

–0.038*

0.018

–0.177**

0.041

0.008

0.013

–0.032

0.019

–0.199**

0.067

III

Intercept
wyraz wolny

46.638

0.302

1.841

0.014

3.937

0.031

1.494

0.010

3.137

0.013

5.053

0.049

ANXA9 add

–0.778*

0.359

–0.064**

0.017

–0.112**

0.037

–0.037**

0.012

–0.032

0.016

0.035

0.058

ANXA9 dom

–0.386

0.482

–0.019

0.023

–0.026

0.050

–0.016

0.016

–0.007

0.021

–0.153*

0.078

IV

Intercept
wyraz wolny

47.270

0.318

1.861

0.015

3.947

0.033

1.504

0.011

3.115

0.013

5.293

0.050

ANXA9 add

–2.077**

0.480

–0.129**

0.023

–0.170**

0.050

–0.081**

0.016

–0.031

0.020

0.146

0.076

ANXA9 dom

–2.852**

0.639

–0.158**

0.030

–0.164**

0.067

–0.100**

0.021

0.002

0.027

0.034

0.101

V

Intercept
wyraz wolny

45.562

0.373

1.795

0.018

3.936

0.041

1.449

0.012

3.098

0.016

5.442

0.063

ANXA9 add

0.402

0.645

–0.046

0.032

–0.198**

0.071

–0.001

0.022

–0.040

0.027

–0.404**

0.109

ANXA9 dom

0.245

0.850

–0.027

0.042

–0.108

0.093

–0.001

0.028

–0.010

0.036

–0.427**

0.144

VI

Intercept
wyraz wolny

42.372

0.765

1.738

0.036

4.211

0.080

1.330

0.025

3.122

0.032

5.662

0.122

ANXA9 add

0.810

0.851

0.009

0.040

–0.207*

0.089

0.002

0.028

–0.126**

0.035

–0.525**

0.136

ANXA9 dom

0.167

1.124

0.019

0.053

–0.101

0.118

–0.003

0.037

–0.069

0.047

–0.665**

0.179

Total
Ogółem

Intercept
wyraz wolny

39.169

0.371

1.464

0.017

3.719

0.037

1.245

0.039

3.102

0.016

5.208

0.061

ANXA9 add

–0.167

0.166

–0.044

0.008

–0.131

0.016

–0.021

0.017

–0.049

0.007

–0.036

0.027

ANXA9 dom

–0.080

0.223

–0.030

0.010

–0.101

0.022

–0.013

0.023

–0.033

0.010

–0.148

0.036

** statistically significant at P ≤ 0.01; * statistically significant at P ≤ 0.05; SE – standard error.
** istotne statystycznie przy P ≤ 0,01; * istotne statystycznie przy P ≤ 0,05; SE – błąd standardowy.

When analyzing daily milk yield, a significant additive effect of the allele A which resulted in a decrease in the value of this trait was found in lactations III and IV, while a positive effect associated with its increase – in lactation I. Allele A was significantly associated with a fat yield decreasing in II, III and IV lactations, as well as with milk fat content decreasing in all the analyzed lactations.

The presence of this allele was also resulted in a protein yield decrease, which was observed in lactations III and IV, as well as in a milk protein content decrease, which was found in II, VI and subsequent lactations. In the case of somatic cell count, the analysis showed a significant additive effect of the ANXA9 SNP in I, II, V and VI lactations except the second one. The effect of the allele A toward increasing SCC was found in the first lactation, while in the remaining ones mentioned above a decrease in the somatic cells count in milk was observed.

Based on the statistical analysis, the dominance of the allele A in shaping the analyzed traits was found. With regard to milk yield, this effect was statistically significant in lactations I and IV, and resulted in an increased and decreased value of this trait, respectively. A significant dominant effect of the allele A was also found with regard to the fat yield and milk fat content in lactations II and IV. In the case of protein yield, a statistically significant dominant effect of the above allele was observed in IV lactation. When analyzing the somatic cell count, a significant dominant effect of the allele A was found in lactation II, III, V and VI. Its effect resulted in a decreased SCC.

DISCUSSION

Cow’s milk is an important component of the human diet. It is a valuable source of essential nutrients [Čítek et al. 2019Čítek, J., Hanusová, L., Lískovcová, L., Samková, E., Hanuš, O., Hasoňová, L., Křížová, Z., Večerek, L. (2019). Polymorphisms in CSN3, CSN2 and LGB genes and their relation to milk production in dairy cattle in the Czech Republic. Acta Univ. Agric. Silvic. Mendel. Brun, 67(1), 19–24. https://doi.org/10.11118/actaun201967010019]. The production of market milk in Poland is based on the Holstein-Friesian breed [Litwińczuk and Barłowska 2014Litwińczuk, Z., Barłowska, J. (2014). Dairy cattle population in Poland and its usefulness for dairy farming [Populacja bydła mlecznego w Polsce i jej przydatność dla mleczarstwa]. Prz. Hod., 4, 3–10 [in Polish]. Google Scholar]. Polish Holstein-Friesian Black and White variety cattle are the most frequently represented in Poland. The breed was created by crossing a local lowland Black and White breed with Holstein-Friesian cattle imported from the United States and Canada since the 1970s [Litwińczuk and Barłowska 2014Litwińczuk, Z., Barłowska, J. (2014). Dairy cattle population in Poland and its usefulness for dairy farming [Populacja bydła mlecznego w Polsce i jej przydatność dla mleczarstwa]. Prz. Hod., 4, 3–10 [in Polish]. Google Scholar]. In 2018, an average of 691,836.3 cows of this breed were subject to performance recording, which constituted 85% of the entire population assessed. Polish Holstein-Friesian cows were characterized by the highest milk yield, 8,519 kg [PZHiPBM 2019PZHiPBM (2019). Breeding program for Polish Holstein-Friesian cattle [Program hodowlany dla bydła rasy polskiej holsztyńsko-fryzyjskiej]. Version updated on August 20, 2019 [in Polish]. Google Scholar].

The goal of the breeding program for Polish Holstein-Friesian cattle is to achieve the greatest genetic progress in improving production traits, with particular emphasis on the milk yield and quality (the yield of fat and protein, the content of fat, protein, lactose and dry matter in milk). While implementing the breeding program, it is also assumed to improve functional traits such as fertility, udder health, longevity, milking rate and milking behavior, as well as type and body conformation traits. The systematic development of performance control with extensive use of the possibilities offered by genomic assessment may contribute to the optimization of genetic progress [PZHiPBM 2019PZHiPBM (2019). Breeding program for Polish Holstein-Friesian cattle [Program hodowlany dla bydła rasy polskiej holsztyńsko-fryzyjskiej]. Version updated on August 20, 2019 [in Polish]. Google Scholar].

The economic significance of milk production and health-promoting effects of milk have resulted in the implementation of numerous studies on polymorphisms in candidate genes related to milk performance traits. Research focuses on analyzing the relationship between the values of these traits and polymorphic variants of different genes. The genes encoding different proteins, such as milk proteins, enzymes involved in the metabolism of fatty acids, proteins binding and transporting fatty acids, some hormones, transcription factors and many others are analyzed in this aspect [Szewczuk et al. 2011Szewczuk, M., Wilkowiecki, P., Zych, S., Czerniawska-Piątkowska, E., Wójcik, J. (2011). The relationship between two polymorphic sites in the 4th intron of the gene encoding insulin-like growth factor receptor 1 (IGF1R / Mph1103I and IGF1R / HinfI) and the milk performance traits of Polish Holstein-Friesian cattle [Związek pomiędzy dwoma miejscami polimorficzymi w intronie 4 genu kodującego receptor insulinopodobnego czynnika wzrostu typu 1 (IGF1R/Mph1103I oraz IGF1R/HinfI) a cechami użytkowości mlecznej bydła polskiego holsztyńsko-fryzyjskiego]. Acta Sci. Pol. Zootechnica, 10(4), 133–140 [in Polish]. Google Scholar, Cieślińska et al. 2019Cieślińska, A., Fiedorowicz, E., Zwierzchowski, G., Kordulewska, N., Jarmołowska, B., Kostyra, E. (2019). Genetic Polymorphism of β-Casein Gene in Polish Red Cattle – Preliminary Study of A1 and A2 Frequency in Genetic Conservation Herd. Animals (Basel), 9(6), 377. https://doi.org/10.3390/ani9060377, Thuy et al. 2018Thuy, N.T.D., Thu, N.T., Cuong, N.H., Ty, L.V., Nguyen, T.T.B., Khoa, D.V.A. (2018). Polymorphism of PIT-1 and prolactin genes and their effects on milk yield in Holstein Friesian dairy cows bred in Vietnam. Russ. J. Genet., 54(3), 346–352. https://doi.org/10.1134/S1022795418030146, Kiyici et al. 2019Kiyici, J.M. Arslan, K., Akyuz B., Kaliber, M., Aksel, E.G., Çinar, M.U. (2019). Relationships between polymorphisms of growth hormone, leptin and myogenic factor 5 genes with some milk yield traits in Holstein dairy cows. Int. J. Dairy Technol. 72(1), 1–7. https://doi.org/10.1111/1471-0307.12539].

The approach to identify mutations in candidate genes is not losing popularity. The ANXA9 gene may be useful in this type of research. The analyzed 951A/G SNP is located in the coding sequence of the gene and results in an amino acid substitution at the protein level. Moreover, the ANXA9 is located in a region in which the QTL for milk fat content and other milk production related traits were previously mapped [Ashwell et al. 2004Ashwell, M.S., Heyen, D.W., Sonstegard, T.S., Van Tassell, C.P., Da Y., Van Raden, P.M., Ron, M., Weller, J.I., Lewin, H.A., (2004). Detection of quantitative trait loci affecting milk production, health, and reproductive traits in Holstein cattle. J. Dairy Sci., 87(2), 468–75. https://doi.org/10.3168/jds.S0022-0302(04)73186-0, Ogorevc et al. 2009Ogorevc, J., Kunej, T., Razpet, A., Dovc, P., (2009). Database of cattle candidate genes and genetic markers for milk production and mastitis. Anim. Genet., 40, 832–851. https://doi.org/10.1111/j.1365-2052.2009.01921.x]. So, the analyzed SNP may be also linked to another polymorphism, which significantly affects the milk performance traits.

In this study the ANXA9 allele A turned out to have higher frequency in Polish Holstein-Friesian cows, which is consistent with the results obtained by Martínez-Royo et al. [2010]Martínez-Royo, A., Ordovas, L., Zaragoza, P., Altarriba, J., Serrano, M., Rodellar, C., Calvo, J.H. (2010). The bovine annexin 9 gene (ANXA9) is significantly associated with milk-fat yield in a Spanish Holstein-Friesian population. Res. Vet. Sci., 88, 452–455. https://doi.org/10.1016/j.rvsc.2009.12.009 on the Spanish Holstein-Friesian cattle and Kulig et al. [2010]Kulig, H., Kowalewska-Łuczak, I., Kmieć, M., Wojdak-Maksymiec, K. (2010). ANXA9, SLC27A3, FABP3 and FABP4 single nucleotide polymorphisms in relation to milk production traits in Jersey cows. Czech J. Anim. Sci., 55(11), 463–467. https://doi.org/10.17221/1714-CJAS on Jersey cows.

Martínez-Royo et al. [2010]Martínez-Royo, A., Ordovas, L., Zaragoza, P., Altarriba, J., Serrano, M., Rodellar, C., Calvo, J.H. (2010). The bovine annexin 9 gene (ANXA9) is significantly associated with milk-fat yield in a Spanish Holstein-Friesian population. Res. Vet. Sci., 88, 452–455. https://doi.org/10.1016/j.rvsc.2009.12.009 reported significant associations between this SNP and milk and fat yield of Spanish Holstein-Friesian cows with the highest value of this trait in GG cows. Kulig et al. [2013]Kulig, H., Kowalewska-Łuczak, I., Żukowski, K., Kruszyński, W. (2013). FABP3, FABP4 and ANXA9 SNP genotypes in relation to breeding values for milk production traits in Polish Holstein-Friesian cows. Genetika, 49(8), 852–856. https://doi.org/10.1134/S1022795413080085 found that the polymorphism in the ANXA9 was associated with the breeding value for fat content in Polish Holstein-Friesian cows; the GG individuals were characterized by the lowest value of this trait. When analyzing milk performance traits in the present study, a significant additive and dominance effects of the allele A was found in different lactations, generally resulting in a decrease in the value of the traits. Such a discrepancy might have several reasons, among other different statistical models used. The use of EBV contains information from relatives, which is reflected in the results obtained [Chinyere et al. 2014Chinyere, C., Ekine, C.C., Rowe, S.J., Bishop, S.C., de Koning, D-J. (2014). Why breeding values estimated using familial data should not be used for genome-wide association studies. G3 (Bethesda), 4(2), 341–347. https://doi.org/10.1534/g3.113.008706]. In the study conducted by Kulig et al. [2010]Kulig, H., Kowalewska-Łuczak, I., Kmieć, M., Wojdak-Maksymiec, K. (2010). ANXA9, SLC27A3, FABP3 and FABP4 single nucleotide polymorphisms in relation to milk production traits in Jersey cows. Czech J. Anim. Sci., 55(11), 463–467. https://doi.org/10.17221/1714-CJAS no association were found between the SNP and milk production traits in Jersey cows. On the other hand, significant association were found between the genotypes and the SCC in milk, wherein significantly lower value of ln SCC was found in AA and AG cows than in GG animals. The assessment of the analyzed ANXA9 951A/G SNP effect in the present study, taking into account additive and dominance effects, confirmed its statistical significance in shaping somatic cell count. The presence of the allele A was also resulted in a SCC decrease.

CONCLUSION

The obtained results give some insight into the potential involvement of the studied ANXA9 951A/G polymorphism in shaping the milk performance traits in Polish Holstein-Friesian cattle. The statistical analysis, including additive and dominance effects, confirmed that in most cases, the presence of the allele A was generally associated with a decrease in the values of the above traits. Further research are necessary to assess the ANXA9 polymorphism helpfulness in selection strategies aimed at improving milk performance traits in Holstein-Friesian cows.

ACKNOWLEDGEMENT

This study was financed from the statutory activity funds.

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This Article

Received: 12 Dec 2019

Accepted: 31 Dec 2019

Published online: 23 Jan 2020

Accesses: 224

How to cite

Kulig, H., Wojdak-Maksymiec, K., Szewczuk, M., (2019). Assessment of ANXA9 SNP effects on milk performance traits in Polish Holstein-Friesian cows. Acta Sci. Pol. Zootechnica, 18(4), 57–62. DOI: 10.21005/asp.2019.18.4.08.