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Li W, Li W, Song Z, Gao Z, Xie K, Wang Y, Wang B, Hu J, Zhang Q, Ning C, Wang D, Fan X. Marker Density and Models to Improve the Accuracy of Genomic Selection for Growth and Slaughter Traits in Meat Rabbits. Genes (Basel) 2024; 15:454. [PMID: 38674388 PMCID: PMC11050255 DOI: 10.3390/genes15040454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Revised: 03/25/2024] [Accepted: 03/27/2024] [Indexed: 04/28/2024] Open
Abstract
The selection and breeding of good meat rabbit breeds are fundamental to their industrial development, and genomic selection (GS) can employ genomic information to make up for the shortcomings of traditional phenotype-based breeding methods. For the practical implementation of GS in meat rabbit breeding, it is necessary to assess different marker densities and GS models. Here, we obtained low-coverage whole-genome sequencing (lcWGS) data from 1515 meat rabbits (including parent herd and half-sibling offspring). The specific objectives were (1) to derive a baseline for heritability estimates and genomic predictions based on randomly selected marker densities and (2) to assess the accuracy of genomic predictions for single- and multiple-trait linear mixed models. We found that a marker density of 50 K can be used as a baseline for heritability estimation and genomic prediction. For GS, the multi-trait genomic best linear unbiased prediction (GBLUP) model results in more accurate predictions for virtually all traits compared to the single-trait model, with improvements greater than 15% for all of them, which may be attributed to the use of information on genetically related traits. In addition, we discovered a positive correlation between the performance of the multi-trait GBLUP and the genetic correlation between the traits. We anticipate that this approach will provide solutions for GS, as well as optimize breeding programs, in meat rabbits.
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Affiliation(s)
- Wenjie Li
- Department of Animal Genetics and Breeding, Shandong Agricultural University, Taian 271000, China; (W.L.); (W.L.); (Z.S.); (K.X.); (B.W.); (J.H.); (Q.Z.); (C.N.)
- Department of Animal Genetics and Breeding, University of Anhui Agricultural, Hefei 230031, China
| | - Wenqiang Li
- Department of Animal Genetics and Breeding, Shandong Agricultural University, Taian 271000, China; (W.L.); (W.L.); (Z.S.); (K.X.); (B.W.); (J.H.); (Q.Z.); (C.N.)
| | - Zichen Song
- Department of Animal Genetics and Breeding, Shandong Agricultural University, Taian 271000, China; (W.L.); (W.L.); (Z.S.); (K.X.); (B.W.); (J.H.); (Q.Z.); (C.N.)
| | - Zihao Gao
- Department of Animal Genetics and Breeding, Shandong Agricultural University, Taian 271000, China; (W.L.); (W.L.); (Z.S.); (K.X.); (B.W.); (J.H.); (Q.Z.); (C.N.)
| | - Kerui Xie
- Department of Animal Genetics and Breeding, Shandong Agricultural University, Taian 271000, China; (W.L.); (W.L.); (Z.S.); (K.X.); (B.W.); (J.H.); (Q.Z.); (C.N.)
| | - Yubing Wang
- Department of Animal Genetics and Breeding, Shandong Agricultural University, Taian 271000, China; (W.L.); (W.L.); (Z.S.); (K.X.); (B.W.); (J.H.); (Q.Z.); (C.N.)
| | - Bo Wang
- Department of Animal Genetics and Breeding, Shandong Agricultural University, Taian 271000, China; (W.L.); (W.L.); (Z.S.); (K.X.); (B.W.); (J.H.); (Q.Z.); (C.N.)
| | - Jiaqing Hu
- Department of Animal Genetics and Breeding, Shandong Agricultural University, Taian 271000, China; (W.L.); (W.L.); (Z.S.); (K.X.); (B.W.); (J.H.); (Q.Z.); (C.N.)
| | - Qin Zhang
- Department of Animal Genetics and Breeding, Shandong Agricultural University, Taian 271000, China; (W.L.); (W.L.); (Z.S.); (K.X.); (B.W.); (J.H.); (Q.Z.); (C.N.)
| | - Chao Ning
- Department of Animal Genetics and Breeding, Shandong Agricultural University, Taian 271000, China; (W.L.); (W.L.); (Z.S.); (K.X.); (B.W.); (J.H.); (Q.Z.); (C.N.)
| | - Dan Wang
- Key Laboratory of Efficient Utilization of Non-Grain Feed Resources (Co-Construction by Ministry and Province), College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Ministry of Agriculture and Rural Affairs, Taian 271000, China
| | - Xinzhong Fan
- Department of Animal Genetics and Breeding, Shandong Agricultural University, Taian 271000, China; (W.L.); (W.L.); (Z.S.); (K.X.); (B.W.); (J.H.); (Q.Z.); (C.N.)
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de Oliveira Padilha DA, Evangelista AF, Valloto AA, Zadra LEF, de Almeida R, de Almeida Teixeira R, Dias LT. Genetic association between fat-to-protein ratio and traits of economic interest in early lactation Holstein cows in Brazil. Trop Anim Health Prod 2024; 56:90. [PMID: 38413494 DOI: 10.1007/s11250-024-03937-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Accepted: 02/20/2024] [Indexed: 02/29/2024]
Abstract
The aims of this study were to estimate the genetic parameters for fat-to-protein ratio (F:P) within the first 90 days of lactation and to examine their genetic associations with daily milk yield (MY), somatic cell score (SCS), and calving interval between the first and second calving (IFSC) and between the second and third calving (ISTC) during the first three lactations of Holstein cows. We utilized 200,626 production-related data officially recorded from 77,436 cows milked two or three times a day from 2012 to 2022, sourced from the Holstein Cattle Breeders Association of Paraná State, Brazil. The (co)variance components were estimated using animal models, adopting the restricted maximum likelihood (REML) method with single-trait analysis (for heritability and repeatability) and two-trait analysis (for genetic and phenotypic correlations), per lactation. Regardless of lactation number, heritability estimates were relatively low, ranging from 0.08 ± 0.005 to 0.10 ± 0.003 for F:P; 0.08 ± 0.01 to 0.18 ± 0.005 for MY; 0.04 ± 0.01 to 0.07 ± 0.004 for SCS; and 0.03 ± 0.01 for both IFSC and ISTC. Repeatability estimates within the same lactation were low for F:P (ranging from 0.17 ± 0.002 to 0.19 ± 0.03), high for MY (between 0.50 ± 0.003 and 0.53 ± 0.002), and moderate to high for SCS (between 0.39 ± 0.003 and 0.44 ± 0.004). Genetic correlations between F:P and MY ranged from -0.26 ± 0.03 to -0.15 ± 0.02; F:P and SCS, from -0.06 ± 0.03 to -0.03 ± 0.08; F:P and IFSC, 0.31 ± 0.01; F:P and ISTC, 0.20 ± 0.01; MY and IFSC, 0.24 ± 0.05; and MY and ISTC, 0.13 ± 0.08. The fat-to-protein ratio during early lactation showed low genetic variability, regardless of lactation number. Furthermore, it was genetically correlated with MY, IFSC, and ISTC, although there is an antagonistic and unfavorable correlation between traits that can limit genetic progress.
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Affiliation(s)
| | - Amauri Felipe Evangelista
- Postgraduate Program in Animal Science, Department of Animal Science, UFPR, Curitiba, PR, 80035-050, Brazil
| | - Altair Antônio Valloto
- Holstein Cattle Breeders Association of Paraná State (APCBRH), Curitiba, PR, 81200-404, Brazil
| | - Lenira El Faro Zadra
- Advanced Beef Cattle Research Center, Institute of Animal Science, Sertãozinho, SP, 13380-011, Brazil
| | - Rodrigo de Almeida
- Postgraduate Program in Animal Science, Department of Animal Science, UFPR, Curitiba, PR, 80035-050, Brazil
| | | | - Laila Talarico Dias
- Postgraduate Program in Animal Science, Department of Animal Science, UFPR, Curitiba, PR, 80035-050, Brazil
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Genetic Parameters of Somatic Cell Score in Florida Goats Using Single and Multiple Traits Models. Animals (Basel) 2022; 12:ani12081009. [PMID: 35454255 PMCID: PMC9025430 DOI: 10.3390/ani12081009] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 03/29/2022] [Accepted: 04/04/2022] [Indexed: 12/10/2022] Open
Abstract
A total of 1,031,143 records of daily dairy control test of Spanish Florida goats were used for this study. The database was edited, and only the records of the first three lactations were kept. The final database contained 340,654 daily-test somatic cell counts from 27,749 daughters of 941 males and 16,243 goats. The evolution of this count in the last 14 years was analyzed following French and American international associations’ criteria for the risk of mastitis in goats, and confirmed the slight increase in SCS in the last years and the importance of this problem (50% of dairy control tests show a risk of suffering mastitis). For the genetic analysis, the SCS records were log-transformed to normalize this variable. Two strategies were used for the genetic analysis: a univariate animal model for the SCS assuming that SCS does not vary throughout the parities, and a multi-character animal model, where SCS is not considered as the same character in the different parities. The heritabilities (h2) were higher in the multiple traits models, showings an upward trend from the first to the third parity (h2 between 0.245 to 0.365). The genetic correlations of the same trait, as well as between breeding values (GVs) between different parities, were different from unity. The breeding values (EBVs) obtained for both models were subjected to a PCA: the first eigenvector (λ1) explained most of the variations (between 74% to 90%), while the second λ2 accounted for between 9% to 20% of the variance, which shows that the selection will be proportionally favorable but not equivalent in all parities and that there are some variations in the type of response.
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Ilie DE, Mizeranschi AE, Mihali CV, Neamț RI, Goilean GV, Georgescu OI, Zaharie D, Carabaș M, Huțu I. Genome-Wide Association Studies for Milk Somatic Cell Score in Romanian Dairy Cattle. Genes (Basel) 2021; 12:genes12101495. [PMID: 34680890 PMCID: PMC8535694 DOI: 10.3390/genes12101495] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 09/22/2021] [Accepted: 09/22/2021] [Indexed: 02/07/2023] Open
Abstract
Mastitis is one of the most frequently encountered diseases in dairy cattle, negatively affecting animal welfare and milk production. For this reason, contributions to understanding its genomic architecture are of great interest. Genome-wide association studies (GWAS) have identified multiple loci associated with somatic cell score (SCS) and mastitis in cattle. However, most of the studies have been conducted in different parts of the world on various breeds, and none of the investigations have studied the genetic architecture of mastitis in Romanian dairy cattle breeds up to this point in time. In this study, we report the first GWAS for SCS in dairy cattle breeds from Romania. For GWAS, we used an Axiom Bovine v3 SNP-chip (>63,000 Single Nucleotide Polymorphism -SNPs) and 33,330 records from 690 cows belonging to Romanian Spotted (RS) and Romanian Brown (RB) cattle. The results found one SNP significantly associated with SCS in the RS breed and 40 suggestive SNPs with -log10 (p) from 4 to 4.9 for RS and from 4 to 5.4 in RB. From these, 14 markers were located near 12 known genes (AKAP8, CLHC1, MEGF10, SATB2, GATA6, SPATA6, COL12A1, EPS8, LUZP2, RAMAC, IL12A and ANKRD55) in RB cattle, 3 markers were close to ZDHHC19, DAPK1 and MMP7 genes, while one SNP overlapped the HERC3 gene in RS cattle. Four genes (HERC3, LUZP2, AKAP8 and MEGF10) associated with SCS in this study were previously reported in different studies. The most significant SNP (rs110749552) associated with SCS was located within the HERC3 gene. In both breeds, the SNPs and position of association signals were distinct among the three parities, denoting that mastitis is controlled by different genes that are dependent according to parity. The current results contribute to an expansion in the body of knowledge regarding the proportion of genetic variability explained by SNPs for SCS in dairy cattle.
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Affiliation(s)
- Daniela Elena Ilie
- The Molecular Research Department, Research and Development Station for Bovine Arad, Bodrogului Street, No. 32, 310059 Arad, Romania; (A.E.M.); (C.V.M.); (R.I.N.); (G.V.G.)
- Faculty of Veterinary Medicine, Banat’s University of Agricultural Sciences and Veterinary Medicine “King Michael I of Romania” from Timisoara, Calea Aradului No. 119, 300645 Timisoara, Romania; (O.I.G.); (I.H.)
- Correspondence:
| | - Alexandru Eugeniu Mizeranschi
- The Molecular Research Department, Research and Development Station for Bovine Arad, Bodrogului Street, No. 32, 310059 Arad, Romania; (A.E.M.); (C.V.M.); (R.I.N.); (G.V.G.)
| | - Ciprian Valentin Mihali
- The Molecular Research Department, Research and Development Station for Bovine Arad, Bodrogului Street, No. 32, 310059 Arad, Romania; (A.E.M.); (C.V.M.); (R.I.N.); (G.V.G.)
| | - Radu Ionel Neamț
- The Molecular Research Department, Research and Development Station for Bovine Arad, Bodrogului Street, No. 32, 310059 Arad, Romania; (A.E.M.); (C.V.M.); (R.I.N.); (G.V.G.)
| | - George Vlad Goilean
- The Molecular Research Department, Research and Development Station for Bovine Arad, Bodrogului Street, No. 32, 310059 Arad, Romania; (A.E.M.); (C.V.M.); (R.I.N.); (G.V.G.)
| | - Ovidiu Ionuț Georgescu
- Faculty of Veterinary Medicine, Banat’s University of Agricultural Sciences and Veterinary Medicine “King Michael I of Romania” from Timisoara, Calea Aradului No. 119, 300645 Timisoara, Romania; (O.I.G.); (I.H.)
| | - Daniela Zaharie
- Faculty of Mathematics and Computer Science, West University of Timișoara, 300223 Timisoara, Romania;
| | - Mihai Carabaș
- Faculty of Automatic Control and Computer Science, Politehnica University of Bucharest, 060042 București, Romania;
| | - Ioan Huțu
- Faculty of Veterinary Medicine, Banat’s University of Agricultural Sciences and Veterinary Medicine “King Michael I of Romania” from Timisoara, Calea Aradului No. 119, 300645 Timisoara, Romania; (O.I.G.); (I.H.)
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Genetic Aspects of Somatic Cell Count in Holstein Dairy Cows in Iran. Animals (Basel) 2021; 11:ani11061637. [PMID: 34205847 PMCID: PMC8226697 DOI: 10.3390/ani11061637] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 05/26/2021] [Accepted: 05/28/2021] [Indexed: 11/29/2022] Open
Abstract
Simple Summary Holstein Friesian is the dominant breed of modern dairy cattle in Iran, therefore the development of a genetic evaluation system for economically important traits for this population is needed. Genetic parameters for SCS and its genetic correlations with production traits were estimated in Iranian Holstein cows. The moderate heritability for SCS and its low negative genetic correlations with yield traits indicate that genetic selection for decreasing SCS would have a relatively medium genetic progress with no necessarily antagonistic effects on lactation performance. The estimates found in this study can be considered as the first step to include SCS in the national genetic evaluations in Iranian Holsteins using a multiple-trait, multiple-lactation random regression model. Abstract The aim of this study was to estimate the genetic parameters of somatic cell count (SCC) and its relationship with production traits in the first three parities in Iranian Holstein dairy cows. Data were 1,891,559 test-day records of SCC, milk yield, and milk compositions on 276,217 lactations on 147,278 cows distributed in 134 herds. The number of test-day records in the first, second and third parities were 995,788 (on 147,278 cows), 593,848 (on 85,153 cows), and 301,923 (on 43,786 cows), respectively. Test-day SCCs were transformed to somatic cell scores (SCS). A random regression test-day animal model through four-trait three-lactation was used to estimate variance components for test-day records of SCS and lactation traits were included. Gibbs sampling was used to obtain marginal posterior distributions for the various parameters using a single chain of 200,000 iterates in which the first 50,000 iterates of each chain were regarded as a burn-in period. The mean heritability estimates for SCS (0.15 to 0.18) were lower than those for milk yield (0.36 to 0.38), fat yield (0.30 to 0.31), protein yield (0.31 to 0.32), fat percentage (0.21 to 0.25), and protein percentage (0.21 to 0.22). Low negative genetic correlations ranging from −0.05 to −0.30 were found between SCS and yield traits (milk, fat, and protein yields). The genetic correlation found between SCS and fat percentage was close to zero, however, a low positive genetic correlation ranging from 0.12 to 0.17 was found between SCS and protein percentage. Based on the results, it can be concluded that genetic selection for decreasing SCS would also increase lactation yield. The estimates found in this study can be used to perform breeding value estimations for national genetic evaluations in Iranian Holsteins using a multiple-trait, multiple-lactation random regression model.
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Ahmad SF, Khan NN, Chakraborty D, Rather MA, Shanaz S, Alam S, Ganai NA. Estimation of (Co)Variance components and genetic parameters of fibre traits in Rambouillet sheep using multi-trait analysis. Trop Anim Health Prod 2021; 53:190. [PMID: 33660098 DOI: 10.1007/s11250-021-02637-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Accepted: 02/22/2021] [Indexed: 10/22/2022]
Abstract
The present study aimed to estimate the genetic parameters of different fibre traits, viz., greasy fleece weight, staple length, and fibre diameter in Rambouillet sheep population using a multi-trait animal model. Data, spanning over 10 years (1998-2007) and pertaining to fibre traits at first clip, were collected for a total of 4186 Rambouillet sheep maintained at an organized farm. (Co)Variance structure and genetic parameters were estimated using a multi-trait animal model. The genetic analysis of data was performed based on restricted maximum likelihood (REML) procedure using WOMBAT software. The model incorporated sex of lamb (i = 1, 2), year of birth (j = 1-10), season of birth (k = 1-2), and litter size (l = 1-2) as fixed effects while direct additive genetic and maternal genetic effects were included as random effects. The direct additive genetic heritability estimates were 0.120±0.034, 0.136±0.037, and 0.356±0.070 for greasy fleece weight, staple length, and fibre diameter, respectively. The maternal genetic heritability of all fibre traits under study was very low. Additive genetic correlation was positive and low between greasy fleece weight and staple length; and between staple length and fibre diameter. In conclusion, fibre diameter was moderately heritable which implies that selection may lead to moderate improvement in this trait. The results from the present study will help in formulating optimal breeding plans for improvement of fibre traits in Rambouillet sheep.
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Affiliation(s)
- Sheikh Firdous Ahmad
- Animal Genetics and Breeding, ICAR-National Research Centre on Pig, Rani, Guwahati, Assam, 781131, India.
- Division of Animal Genetics, ICAR-Indian Veterinary Research Institute, Bareilly, Izatnagar, 243122, India.
| | - Nusrat Nabi Khan
- Division of Animal Genetics and Breeding, Faculty of Veterinary Sciences and Animal Husbandry, Shuhama, Ganderbal, 190006, J&K, India
| | - Dibyendu Chakraborty
- Division of Animal Genetics and Breeding, FVSc & AH, SKUAST-J, R.S. Pura, Jammu, J&K, 181102, India
| | | | - Syed Shanaz
- Division of Animal Genetics and Breeding, Faculty of Veterinary Sciences and Animal Husbandry, Shuhama, Ganderbal, 190006, J&K, India
| | - Safeer Alam
- Division of Animal Genetics and Breeding, Faculty of Veterinary Sciences and Animal Husbandry, Shuhama, Ganderbal, 190006, J&K, India
| | - Nazir Ahmad Ganai
- Planning and Monitoring, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Shuhama, Alusteng, Srinagar, J&K, 190006, India
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Mulim HA, Pinto LFB, Valloto AA, Pedrosa VB. Genotype by environment interaction for somatic cell score in Holstein cattle of southern Brazil via reaction norms. Anim Biosci 2020; 34:499-505. [PMID: 32777892 PMCID: PMC7961275 DOI: 10.5713/ajas.20.0031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Accepted: 04/20/2020] [Indexed: 11/27/2022] Open
Abstract
Objective The objective of this study was to evaluate the genetic behavior of a population of Holstein cattle in response to the variation of environmental temperature by analyzing the effects of genotype by environment interaction (GEI) through reaction norms for the somatic cell score (SCS). Methods Data was collected for 67,206 primiparous cows from the database of the Paraná Holstein Breeders Association in Brazil, with the aim of evaluating the temperature effect, considered as an environmental variable, distinguished under six gradients, with the variation range found being 17°C to 19.5°C, over the region. A reaction norm model was adopted utilizing the fourth order under the Legendre polynomials, using the mixed models of analysis by the restricted maximum likelihood method by the WOMBAT software. Additionally, the genetic behavior of the 15 most representative bulls was assessed, in response to the changes in the temperature gradient. Results A mean score of 2.66 and a heritability variation from 0.17 to 0.23 was found in the regional temperature increase. The correlation between the environmental gradients proved to be higher than 0.80. Distinctive genetic behaviors were observed according to the increase in regional temperature, with an observed increase of up to 0.258 in the breeding values of some animals, as well as a reduction in the breeding of up to 0.793, with occasional reclassifications being observed as the temperature increased. Conclusion Non-relevant GEI for SCS were observed in Holstein cattle herds of southern Brazil. Thus, the inclusion of the temperature effect in the model of genetic evaluation of SCS for the southern Brazilian Holstein breed is not required.
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Affiliation(s)
- Henrique Alberto Mulim
- Department of Animal Science, State University of Ponta Grossa, Ponta Grossa, PR, 84030-900, Brazil
| | | | | | - Victor Breno Pedrosa
- Department of Animal Science, State University of Ponta Grossa, Ponta Grossa, PR, 84030-900, Brazil
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Narayana SG, Miglior F, Naqvi SA, Malchiodi F, Martin P, Barkema HW. Genetic analysis of subclinical mastitis in early lactation of heifers using both linear and threshold models. J Dairy Sci 2018; 101:11120-11131. [DOI: 10.3168/jds.2018-15126] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Accepted: 08/21/2018] [Indexed: 11/19/2022]
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Guo XF, Hu WP, Lang XZ, Li QL, Wang XY, Di R, Liu QY, Liu XL, An YF, Chu MX. Two single nucleotide polymorphisms sites in α1- AT gene and their association with somatic cell score in Chinese Holstein cows. JOURNAL OF BIOLOGICAL RESEARCH (THESSALONIKE, GREECE) 2017; 24:8. [PMID: 28413783 PMCID: PMC5390408 DOI: 10.1186/s40709-017-0065-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/03/2016] [Accepted: 04/04/2017] [Indexed: 12/19/2022]
Abstract
BACKGROUND Alpha 1-antitrypsin (α1-AT) may affect the susceptibility of mastitis in dairy cattle for its possible role in the protection of lactoferrin from proteolytic degradation in the mammary. Milk somatic cell score (SCS) is a logarithmic transformation of the milk somatic cell count widely used as an index to evaluate mastitis. To study the relationships of α1-AT gene and SCS in Chinese Holstein cows, methods of PCR-SSCP, DNA sequencing, PCR-RFLP, and CRS-PCR technologies were used to detect single nucleotide polymorphisms sites in α1-AT gene. RESULTS Two polymorphic sites at G5503A and G5746C of α1-AT gene were found. AA (0.3633), AB (0.4644) and BB (0.1723) genotypes were detected at G5503A site, CC (0.3483), CD (0.4906) and DD (0.1611) genotypes were found at G5746C in Chinese Holstein cows. Least squares mean of SCS for individuals with BB genotype was significantly lower than that with AA and AB genotype (p < 0.01), and that with AB genotype was significantly lower than that with AA (p < 0.05). There was no significant difference among individuals with CC, CD and DD genotypes (p > 0.05). Least squares mean of SCS for individuals with BBDD genotype combination were significantly lower than those with AACC and AACD (p < 0.05). CONCLUSIONS Statistical analysis indicated that B allele and BBDD genotype combination of α1-AT can improve mastitis resistance in dairy cattle.
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Affiliation(s)
- Xiao-Fei Guo
- Key Laboratory of Animal Genetics and Breeding and Reproduction of Ministry of Agriculture, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193 China
- College of Animal Science and Technology, China Agricultural University, Beijing, 100193 China
| | - Wen-Ping Hu
- Key Laboratory of Animal Genetics and Breeding and Reproduction of Ministry of Agriculture, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193 China
| | - Xian-Zheng Lang
- College of Animal Science and Technology, Northwest A &F University, Yangling, 712100 China
| | - Qiu-Ling Li
- Life Sciences College, Langfang Teachers University, Langfang, 065000 China
| | - Xiang-Yu Wang
- Key Laboratory of Animal Genetics and Breeding and Reproduction of Ministry of Agriculture, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193 China
| | - Ran Di
- Key Laboratory of Animal Genetics and Breeding and Reproduction of Ministry of Agriculture, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193 China
| | - Qiu-Yue Liu
- Key Laboratory of Animal Genetics and Breeding and Reproduction of Ministry of Agriculture, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193 China
| | - Xiao-Lin Liu
- College of Animal Science and Technology, Northwest A &F University, Yangling, 712100 China
| | - Yong-Fu An
- Hebei Animal Science and Veterinary Medicine Institute, Baoding, 071000 China
| | - Ming-Xing Chu
- Key Laboratory of Animal Genetics and Breeding and Reproduction of Ministry of Agriculture, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193 China
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