effect of radiant heating at the births place of … · 1 aarhus au universitet effect of radiant...
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AARHUS
UNIVERSITET AU
EFFECT OF RADIANT HEATING AT THE BIRTHS PLACE OF NEWBORN PIGLETS
Heidi Mai-Lis Andersen and Lene Juul Pedersen
Project funded by: The pig Levy Foundation and the Advanced Technology Foundation
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AARHUS
UNIVERSITET AU
Sustaining a normal body temperature within the first hours of a piglet’s life is one of the main indicators for piglet survival
Hypothermia is rarely recorded as cause of death in commercial pig herds, but it might often be the primary cause of starvation, crushing and disease
(Herpin et al., 2002, Baxter 2009, Pedersen et al., 2011)
BACKGROUND
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AARHUS
UNIVERSITET AU
BACKGROUND
AARRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRHUSHUSHUSHUSHUSHUSHHUSHUSHUHUSHUSUSUSHUSHUSHHUSHUSHUSHUSHUUSHUHUSSHUSHUHHUSHHHUH SSHHUSHUSHUSSSHUSSHUHUSSHHUUSSSUSHUNIVVVVVERVERVERVERVVERVERVEEVERVERERERVVERVEVERVVVERVERRV RVVERVERERVVERERRERV RERVERVVVVVEERRRVVVV RVEREERRRVVV RRSITSITSITSITSITSITSITSSIIITSITTSITSITSITSITTSITSITSITSSSIIITSITSITSSSITSITSIISITSITSITITSITSSSIITISITITITITTSITSISITTTSISITTITITTTTII ETETEETEEETETETETETETEEETETETTETETEEETETEETTEEETEEETETETEETETETETTETETTTTTETETTTTU
Newborn piglet: - Wet - Hairless - No brown adipose tissue - Low amounts of mobile lipids/glycogen => Poor to thermoregulate
Born into a environment - Whiteout a nest - Temperature ~ 20°C
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AARHUS
UNIVERSITET AU
31
32
33
34
35
36
37
38
39
0 2 4 8 24 t
Piglets rectal temperature at 21°C °C
Hours after birth
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AARHUS
UNIVERSITET AU
BACKGROUND Floor heating in the farrowing area reduced the drop in piglets rectal temperature and improved piglet survival
(Malmkvist et al., 2006, Pedersen et al., 2013) But….
The main part of the farrowing pens are with partly or fully slatted floor
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AARHUS
UNIVERSITET AU
Can radiant heating provided at the birth place � Reduced the drop in rectal temperature in new-born
piglets?
� Reduced time for piglets to recovery to a normal body temperature?
AIM
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AARHUS
UNIVERSITET AU
� 36 second-parity Danish Landrace x Yorkshire sows
� 3 batches of 12 sows each
� Room temperature ~ 20°C
� Two groups: A control group and a heat group
METHOD AND MATERIALS
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AARHUS
UNIVERSITET AU
The heat treatment: � A radiant heater (500 W) � 0.90 m over the farrowing area
TREATMENT
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AARHUS
UNIVERSITET AU
TREATMENT Control
Day -1 Heat on in creep area Birth 1. pig - Birth +12h -
Heat
Heat on in creep area Radiant heat on Radiant heat off
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AARHUS
UNIVERSITET AU
DATA SAMPLING
10
0 12 24 36
Heat: 48
Birth time +
Weight + + + (+Day7)
Rectal temp. +++++ + + + (+Day7)
Hours after birth
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AARHUS
UNIVERSITET AU
Behavioural observations: � Time to leave zone 1 (the heated area) � Time to first contact with udder � Time to first suckling
DATA SAMPLING
1
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AARHUS
UNIVERSITET AU
RESULTS
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AARHUS
UNIVERSITET AU
RECTAL TEMPERATURE Heat off
Heat group Control group
↑ Birth weight => ↓Drop in temperature (P<0.001) No interaction between Birth weight and Treatment
*
*
* *
*
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AARHUS
UNIVERSITET AU
WEIGHT
↑ Birth weight => ↑Daily gain (P<0.001) No interaction between Birth weight and Treatment Confounding effect between Birth weight and Treatment?
P=0.08
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AARHUS
UNIVERSITET AU
BEHAVIOUR
↑ Birth weight => ↓Time to leaving Z1 (P<0.001) ↓ Time to at udder (P<0.001) ↓ Time to suckling (P<0.001) No interaction between Birth weight and Treatment
(16.
9 m
in)
(11.
4 m
in)
(7.5
min
)
(19.
4 m
in)
(47.
3 m
in)
(44.
5 m
in)
*
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AARHUS
UNIVERSITET AU
Radiant heat: � Decrease drop in rectal temperature � Decrease time to recover to a normal rectal temperature � Increase time stay in zone 1 � No effect on time to first suckling � No effect on weight gain Confounding effect between birth weight and treatment?
CONCLUSION