Sep 1, 2017 - 0.07. 0.03. 27.14. 0.30. F%. Fat content, %. -0.65. 0.51. -0.16. 0.25. 0.12. -0.06. -0.03. 0.06. 0.02. -0.04. -0.02. 0.30. 0.19. P%. Protein content, %.
Poster Session 14, poster No. 14 Abstract No. 26958
Efficiency of selection indices for milk flow, production and conformation traits in Holsteins T.
1,2 Kaart ,
1Institute
1 Pretto ,
D.
A.
1,2 Tänavots ,
H.
1,2 Kiiman
and E.
1,2 Pärna
of Veterinary Medicine and Animal Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, 51014 Tartu, Estonia 2BioCC LLC, Kreutzwaldi 1, 51014 Tartu, Estonia
THE AIM To estimate the annual genetic response for average milk flow (AMF), milk yield (MY), milk components and somatic cell score (SCS) and udder conformation traits (UCT) in Estonian Holstein (EH) population under different selection indices.
BACKGROUND • Total number of dairy cows 86,300 (about 0.4% of EU dairy cows), of which 95.3% are in milk recording. 79.6% of cows are Estonian Holstein (EH) and 19.5% Estonian Red. Average herd size is 135 cows. • Udder diseases are the most frequent • Productivity of EH: 9,561 kg milk, 3.97% fat, 3.34% protein culling reasons among EH cows. and rapidly increasing. 8932
9561
5182 3791
4332
4586 3915
Milk production, kg
8232 9082 7778 8611 7926
6722
Other diseases Metabolic 8% diseases Accidents 11% 12% Feet diseases 18%
Udder diseases 20%
Fertility 19%
Other reasons 6% Age 1% Low productivity 5%
Genetic correlations
GENETIC PARAMETERS MY FY PY F% P% SCS AMF TL FUA UD RUH UC
Phenotypic correlations MY FY PY F% Milk yield, kg/lact 0.74 0.92 Fat yield, kg/lact 0.49 0.81 Protein yield, kg/lact 0.83 0.66 Fat content, % -0.65 0.51 -0.16 Protein content, % -0.51 0.20 0.15 SCS 0.12 0.07 0.22 AMF, kg/min 0.52 0.44 0.49 Teat length 0.11 0.03 0.10 Fore udder attachment -0.47 -0.30 -0.44 Udder depth -0.39 -0.43 -0.42 Rear udder height 0.39 0.31 0.34 Udder cleft 0.17 0.07 0.16
P% -0.33 0.37 -0.12 0.49 -0.05 -0.18 -0.10 0.26 0.07 -0.16 -0.12
SCS -0.18 0.08 0.10 0.25 -0.02 -0.25 -0.04 0.25 0.08 -0.24 -0.11
AMF -0.12 -0.09 -0.05 0.12 0.16 0.33 -0.07 -0.20 -0.42 -0.21 -0.32
TL
0.18 0.11 0.15 -0.06 -0.10 0.06 -0.30 -0.13 0.08 0.33 0.17
FUA 0.03 0.01 0.02 -0.03 -0.01 -0.01 -0.13
UD -0.10 -0.05 -0.08 0.06 0.07 -0.03 -0.05 0.07
0.18 0.04 -0.10 0.01
0.57 0.27 -0.14
RUH -0.12 -0.10 -0.11 0.02 0.03 -0.08 0.04 0.00 0.27 0.47 0.05
UC
0.09 0.06 0.07 -0.04 -0.07 -0.03 0.13 0.01 0.14 0.24 0.18
0.03 0.01 0.03 -0.02 -0.03 -0.04 0.05 0.01 0.01 0.10 0.08
Genetic SD (σA) 875.40 33.74 27.14 0.30 0.13 0.42 0.52 0.57 0.52 0.95 0.49 0.50
h2 0.31 0.29 0.30 0.19 0.28 0.05 0.50 0.39 0.22 0.47 0.29 0.19
Sources: multivariate animal model applied to AMF (19,316 single records), milk production traits (302,629 repeated records) and udder conformation traits (11,143 single records) collected by Estonian Livestock Performance Recording Ltd from July 2010 to January 2016; Castillo-Juarez et al, 2002; Vallas et al, 2010.
SELECTION INDEXES AND GENETIC GAIN Five different selection indexes were compared: 1. SPAV, relative breeding value of milk production: SPAV = 93.7 + 0.12*BVFY + 0.48*BVPY, currently basic selection index in Estonia 0.30 2. 75% SPAV + 25% −BVAMF 3. 75% SPAV + 25% BVAMF 5. 75% SPAV + 25% BVUCT BV – Breeding Value Methodology: Pretto et al, 2012.
0.25
Genetic Gain, (Genetic SD)/Year
4. 75% SPAV + 25% −BVSCS
SPAV 75% SPAV + 25% −BVAMF 75% SPAV + 25% BVAMF 75% SPAV + 25% −BVSCS 75% SPAV + 25% BVUCT
0.20 0.15 0.10 0.05 0.00 -0.05 -0.10 -0.15
Milk yield Fat yield
Protein yield
Fat content
ACKNOWLEDGEMENTS. BioCC LLC (project EU48686); Estonian Ministry of Education and Research (grant IUT8-1). Estonian Livestock Performance Recording Ltd.
Protein content
SCS
AMF
Teat Fore udder Udder length attach. depth
Rear udder height
Udder cleft
68th Annual Meeting of the European Federation of Animal Science, Tallinn, Estonia, 28 Aug – 1 Sept 2017
