feeding behaviour in dairy goats, a repeatable trait … · feeding behaviour in dairy goats, a...
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.01 S. Giger-Reverdin et al.
13 / 10 / 2016 S. Giger-Reverdin
Feeding behaviour in dairy goats, a repeatable trait which can be measured automatically
Sylvie Giger-Reverdin, Christine Duvaux-Ponter & Nicolas C Friggens
Modélisation Systémique Appliquée aux Ruminants (Systemic modelling applied to ruminants)
INRA, AgroParisTech, Université Paris-Saclay
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Introduction
Feeding behaviour influences dry matter intake is highly variable between animals is a key-factor to explain the inter-individual variation in the evolution of rumen pH (occurrence of acidosis)
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Aim of the work: look for repeatable and pertinent criteria to evaluate this trait in dairy goats
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Experimental design
35 dairy goats
1 TMR diet ad libitum: 20 % Concentrate 20 % Meadow hay 30 % Dehydrated lucerne 30 % Pressed sugar beet pulp silage
Automatic measurement of feed intake (2 min.)
3 periods (3 or 4 days/period) • 1st lactation • 2nd gestation & end of 1st lactation • 2nd lactation
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2 Phenotypes measured Q90 P90: Proportion of dry matter eaten 90 min after the afternoon feed allowance which corresponded to two thirds of the daily feed allowance (P90).
)
960840720600480360240180120600
35
30
25
20
15
10
5
0
Time after feeding (min)
DM
I (g
/kg
BW
)
Goat A
Goat B
Dry matter intake evolution (pm Feed allowance )
P90 = 0.90
P90 = 0.38
(Giger-Reverdin, 2009)
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P3: 2nd lactation P1: 1st lactation
P2: end 1st lactation
4 days/period
0
10
20
30
40
50
60
0 120 240 360 480 600 720 840 960 1080 1200 1320Cu
mu
lati
ve d
ry m
atte
r in
take
(g/
kg B
W)
Time after the afternoon feeding (min)
Evolution of intake after afternoon feeding
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0
10
20
30
40
50
60
0 120 240 360 480 600 720 840 960 1080 1200 1320
Cu
mu
lati
ve d
ry m
atte
r in
take
(g/
kg B
W)
Time after afternoon feeding (min)
Evolution of intake after afternoon feeding
P1: 1st lactation
P3: 2nd lactation P2: end 1st lactation
4 days/period
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20
15
10
201510
25
20
15
201510
Q90_1
Q90_2
Q90_3
11044
11048
11055
11056
11062
11064
11066
11069
11070
11071
11009
11072
11073
11074
11079
11084
11090
11092
11093
11096
11097
11014
11100
11107
11109
11110
11111
11112
11015
11016
11024
11025
11035
11036
11040
Goat
Between-periods correlation for Q90
0.61**
0.42*0.28
N = 35
Proportions of feed eaten after afternoon feeding
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
0 120 240 360 480 600 720 840
Time after the afternoon feeding (min)
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
0 120 240 360 480 600 720 840
Time after the afternoon feeding (min)
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0.60
0.45
0.30
0.60.40.2
0.7
0.6
0.5
0.600.450.30
P90_1
P90_2
P90_3
11044
11048
11055
11056
11062
11064
11066
11069
11070
11071
11009
11072
11073
11074
11079
11084
11090
11092
11093
11096
11097
11014
11100
11107
11109
11110
11111
11112
11015
11016
11024
11025
11035
11036
11040
Goat
Between periods correlation for P90
0.54**
0.63** 0.38*
N = 35
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Discussion and practical implications
High intra-period individual repeatability
High between-period repeatability characterisation of the feeding behaviour during the 1st lactation adjustment of feeding in the following lactations to decrease the
occurrence of acidosis
Possibility to phenotype goats on intake rate in precision livestock farming