Genetic parameters for female fertility in Nordic dairy cattle
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1 Genetic parameters for female fertility in Nordic dairy cattle K.Muuttoranta 1, A-M. Tyrisevä 1, E.A. Mäntysaari 1, J.Pösö 2, G.P. Aamand 3, J-Å. Eriksson 4, U.S. Nielsen 5, and M. Lidauer 1 1 Natural Resources Institute Finland, 2 Faba Co-op, 3 Nordic Cattle Genetic Evaluation, 4 Växa Sweden; 5 SEGES Cattle 2015 Interbull Annual Meeting, Orlando
2 Background Nordic Cattle Genetic Evaluation Sweden, Finland and Denmark The fertility model implemented in 2003 is under updating - first update May 2015: from sire model to multi-lactation multi-trait animal model - second update in 2016: revision of model effects and variance components Updated VCE with correlations needed 2
3 Sampled data Holstein and Nordic Red Dairy Cattle (RDC) 400 herds in Sweden with minimum 12 (8) first-calvers / year Years HOL RDC Females with records Sires with daughters
![Sampled data, traits 1. non-return rate in 56 days [0 or 100] NRR0, NRR1, NRR2, NRR3 (heifers, 1 st, 2 nd and 3 rd parity) 2.](/docs-images/88/115978368/images/4-1.jpg "interval from the first to the last service [days] IFL0, IFL1, IFL2, IFL3 (per parity) 3.")
4 Sampled data, traits 1. non-return rate in 56 days [0 or 100] NRR0, NRR1, NRR2, NRR3 (heifers, 1 st, 2 nd and 3 rd parity) 2. interval from the first to the last service [days] IFL0, IFL1, IFL2, IFL3 (per parity) 3. interval from calving to the first service [days] ICF1, ICF2, ICF3 (per parity)
5 Models Multivariate, multilactation sire model 11 traits; heifers + cows (1. 3. parities) Fixed effects: 1) herd*birth year (heifers) or herd*actual calving year (cows) 2) insemination year-month (for NRR and IFL) or actual calving year-month (for ICF) 3) heifers first insemination age EM-REML, MiX99 (MiX99 Development Team, 2015, Luke, Matilainen, Mäntysaari, Lidauer, Strandén & Thompson, 2012) 5
6 Results (1): heritabilities 6
7 Holstein: h 2 NRR0 IFL0 NRR1 ICF1 IFL1 NRR2 ICF2 IFL2 NRR3 ICF3 IFL3 NRR NRR: 0.01 IFL IFL: NRR ICF: ICF IFL NRR ICF IFL NRR ICF IFL
8 RDC: h 2 NRR0 IFL0 NRR1 ICF1 IFL1 NRR2 ICF2 IFL2 NRR3 ICF3 IFL3 NRR NRR: 0.01 IFL IFL: NRR ICF: ICF IFL NRR ICF IFL NRR ICF IFL
9 Results (2): Genetic correlations within traits Within traits genetic correlations ranged from moderate to high across the different parities 9
10 Holstein: h 2 diagonal, r g upper triangle, r p lower triangle NRR0 IFL0 NRR1 ICF1 IFL1 NRR2 ICF2 IFL2 NRR3 ICF3 IFL3 NRR IFL NRR ICF IFL NRR ICF IFL NRR ICF IFL
11 Non-return rate, genetic correlations across parities in Holstein NRR1 NRR2 NRR3 NRR NRR NRR In RDC the correlations ranged between
12 Interval from first to last service, genetic correlations across parities in Holstein IFL1 IFL2 IFL3 IFL IFL IFL In RDC the correlations ranged between
13 Interval from calving to the first service, genetic correlations across parities in Holstein ICF2 ICF3 ICF ICF In RDC the correlations ranged between
14 Results (3): Genetic correlations between the traits Between traits correlations ranged widely; the highest values were estimated within lactations 14
15 Genetic correlations between traits in Holstein IFL0 NRR1 IFL1 ICF1 NRR IFL NRR IFL NRR and IFL in heifers had a stronger correlation than NRR0 and IFL in later parities
16 Genetic correlations between traits in Holstein IFL0 NRR1 IFL1 ICF1 NRR IFL NRR IFL Unfavorable correlation between NRR and ICF
17 Genetic correlations between traits in Holstein IFL0 NRR1 IFL1 ICF1 NRR IFL NRR IFL Positive correlations between interval traits
18 Genetic correlations between traits in Holstein IFL0 NRR1 IFL1 ICF1 NRR IFL NRR IFL In RDC the differences compared to HOL spanned from 3 to 20 % in NRR and in IFL ; and in ICF1 from 10 to 80 %
19 Results (4): Phenotypic correlations Estimated phenotypic correlations were low as expected exception: NRR and IFL had a moderate negative correlation within parities 19
20 Holstein: phenotypic correlations (h 2 on diagonal) NRR0 IFL0 NRR1 ICF1 IFL1 NRR2 ICF2 IFL2 NRR3 ICF3 IFL3 NRR IFL NRR ICF IFL NRR ICF IFL NRR ICF IFL
21 Conclusions Heritability estimates were low - lowest for NRR (~0.01) - highest for ICF in HOL ( ) - between breed largest difference in heritability was found for ICF Genetic correlation estimates ranged from moderate to high within traits (across parities) -> parities should be modelled as different traits Between different traits the genetic correlations were moderate Correlation structure similar between HOL and RDC The VC can be used for the fertility traits 21 in the updated model
22 Thank you for your time!
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