figure 1: age structure and sex ratio pmwhr spring 2004 total herd size = 161 horses known age to 8...
TRANSCRIPT
Figure 1: Age Structure and Sex RatioFigure 1: Age Structure and Sex RatioPMWHR Spring 2004PMWHR Spring 2004
0
5
10
15
20
25
30
Nu
mb
er o
f H
ors
es
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
Age Class (in years)
Male Female
Total Herd Size = 161 HorsesKnown Age to 8 years
Estimated Age 9-25 years
Figure 2: Mare Pregnancy ResultsFigure 2: Mare Pregnancy ResultsPMWHR Spring 2004PMWHR Spring 2004
0
2
4
6
8
10
12
14
16
Nu
mb
er o
f M
ares
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Age Class of Mares
With Foal Without Foal Unknown
Total Mares = 76Known Age to 8 Years
Estimated Age 9-18 Years
Figure 3: Mare Interchange ActivityFigure 3: Mare Interchange ActivityPMWHR 1998-2003PMWHR 1998-2003
0
10
20
30
40
50
60
70
Ave
rag
e %
of
bre
edin
g-a
ge
mar
es
0 1 2 3 4 5 6 7 8 9 10
Number of interchanges
Mare without foal
Mare with foal
Number of breeding age mares (age > 2) = 404
Number of foals = 200
Figure 4: Mare Interchange ActivityFigure 4: Mare Interchange ActivityPMWHR 1998-2003PMWHR 1998-2003
0
10
20
30
40
50
60
70
Ave
rag
e %
of
bre
edin
g-a
ge
mar
es
0 1 2 3 4 5 6 7 8 9 10
Number of interchanges
Mare without foal
Mare with foal
Number of breeding age mares (age > 1) = 483
Number of foals = 200
Figure 5: Harem Interchanging Mares Figure 5: Harem Interchanging Mares Losing Foals - Losing Foals - PMWHR 1998-2003PMWHR 1998-2003
1
6,2
1,2,3,4
7 2
1,3
1
1,2,3
2 2
0
1
2
3
4
5
Nu
mb
er o
f M
ares
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Age Class of Mares
Numbers indicate the number of interchanges per mare.
N= 17 mares
Figure 6: Ages of Interchanging MaresFigure 6: Ages of Interchanging MaresPMWHR 1998 - 2003PMWHR 1998 - 2003
0
5
10
15
20
25
30
35
40
Nu
mb
er o
f m
ares
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Age class of mares
1998 1999 2000 20012002 2003 all years
N = 187 Mares
0
1
2
3
71 73 75 77 78 79 80 81 82 83 84 85 86 92 93 94 95 96 97 98 99 00 1 2 3
Year
Se
x R
ati
o (
ma
les
/fe
ma
les
)
Herd Sex Ratio Foal Crop Sex Ratio
Figure 7: Herd and Foal Crop Sex Figure 7: Herd and Foal Crop Sex Ratio - PMWHR 1971-2003Ratio - PMWHR 1971-2003
Even numbers of males and females is represented by a sex ratio of 1.All Data Approximate
Figure 8: Annual Foaling RateFigure 8: Annual Foaling RatePMWHR 1996 - 2003PMWHR 1996 - 2003
0
20
40
60
80
100
Nu
mb
er
or
% o
f b
ree
din
g a
ge
ma
res
1996 1997 1998 1999 2000 2001 2002 2003 Average
Mares > 1 year old Recorded Foals (%) Surviving Foals (%)
Figure 9: Age Class Foaling RatesFigure 9: Age Class Foaling Rates PMWHR 1996-2003PMWHR 1996-2003
0
10
20
30
40
50
60
70
80
Per
cen
t o
f A
ge
Cla
ss F
oal
ing
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Age Class of Mares
Surviving Foals Non-Surviving Foals All Foals
N = 518 Maresand 269 foals
0
50
100
150
200
250
300
Pre-71
71 73 75 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 00 1 2 3
Year
Nu
mb
er o
f H
ors
es
Pre-Removal Post-Removal Surviving Foals
Figure 10: Population Numbers Figure 10: Population Numbers PMWHR 1971-2003PMWHR 1971-2003
All Data Approximate
Figure 11: Foaling PeriodsFigure 11: Foaling PeriodsPMWHR 1996-2003PMWHR 1996-2003
0
5
10
15
20
25
30
Nu
mb
er o
f F
oal
s B
orn
Feb Mar Apr May June July Aug Sept
Month of Birth
1996 1997 1998 1999 2000 2001 2002 2003
Figure 12: Annual Foal Production by Figure 12: Annual Foal Production by Age Class of Mares - PMWHRAge Class of Mares - PMWHR
0
2
4
6
8
10
Nu
mb
er o
f F
oal
s
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Age (in years)
1996 1997 1998 1999 2000 2001 2002 2003
-50
-40
-30
-20
-10
0
10
20
30
40
50
75 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 00 1 2 3
Year
Rat
e o
f In
crea
se i
n H
erd
Siz
e
Rate of Increase
Figure 13: Rate of Annual Increase Figure 13: Rate of Annual Increase in Herd Size PMWHR 1971-2003in Herd Size PMWHR 1971-2003
All Data Approximate
Figure 14: Annual Foal Crop SurvivalFigure 14: Annual Foal Crop SurvivalPMWHR 1996 - 2003PMWHR 1996 - 2003
0.2
0.4
0.6
0.8
1
Pe
rce
nt
of
Fo
als
Bo
rn
1996 1997 1998 1999 2000 2001 2002 2003
Male Female All Foals
Figure 15: Total Foal ProductionFigure 15: Total Foal ProductionPMWHR 1996-2003PMWHR 1996-2003
0
5
10
15
20
25
30
35
To
tal
nu
mb
er o
f fo
als
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Age of mares
Male Foals Female Foals
N = 518 MaresTotal of 269 Foals
Figure 16: Recorded MortalityFigure 16: Recorded MortalityPMWHR 1996-2003PMWHR 1996-2003
05
101520253035404550556065
Est
imat
ed n
um
ber
of
dea
ths
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
Age class of horses(Based on known deaths or horses missing for at least two years)
Females
Males
Age < 8 = known ageAge > 8 = estimated age
Figure 17: Foal Siring by Harem StallionsFigure 17: Foal Siring by Harem Stallions PMWHR 1996-2003PMWHR 1996-2003
0
5
10
15
20
25
30
35
Nu
mb
er o
f S
tall
ion
s
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Age Class of Harem Stallions
Stallions - Surviving Foals Stallions - Live Foals Harem Stallions
Based on observational data for 246 harem stallions
and 269 foals(Age<9 is known)
Figure 18: Foal Numbers by Harem StallionsFigure 18: Foal Numbers by Harem Stallions PMWHR 1996-2003PMWHR 1996-2003
Based on observational data for 246 harem stallions
and 269 foals(Age<9 is known)
0
2
4
6
8
10
12
14
16
18
Nu
mb
er o
f S
talli
on
s
1997 1998 1999 2000 2001 2002 2003
No Foals One Foal Two Foals Three Foals Four Foals
Based on observational data for 246 harem stallionswith surviving foals
Extra Figure: Herd Color BalanceExtra Figure: Herd Color Balance PMWHR 1996-2003PMWHR 1996-2003
0
5
10
15
20
25
30
Per
cen
t o
f to
tal
her
d s
ize
1996 1997 1998 1999 2000 2001 2002 2003
Bay Black Dun Sorrel Grullo Roan Other