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Brage NMBU
Master thesis . 2016
Data sources: Brage NMBU
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Unge søyers preferanser for golvtyper ved lave temperaturer

Authors: Johanssen, Juni Rosann Engelien;

Unge søyers preferanser for golvtyper ved lave temperaturer

Abstract

The aim of this master thesis was to investigate flooring preferences in young ewes at low temperatures using paired choice tests. In addition, heat technical characteristics of the floors were investigated. The paired choice test was conducted at the Norwegian Institute of Bioeconomy Research in Tjøtta with 30 young, barren ewes of the breed Norwegian White Sheep, from 7th January 2016 to 28th January 2016 , 6 to 9 weeks after shearing of the ewes. The ewes were divided into 10 groups consisting of 3 ewes per group, and the groups were rotated between the 10 pens with two types of floor in each pen. The five floor materials were: slatted floor of composite material, expanded metal floor, plastic slatted floor, floor of solid wood, and floor of solid rubber mats. Behavioral observations were done, and the data were then analyzed with a mixed model in SAS. Measurements of surface temperatures of animals and floor were performed. In addition to this, we also measured heat loss to floor for the five flooring types, as well as floor of solid wood and rubber mats with a layer of saw dust, and for straw (on floor of solid wood). There was wide variation in the surface temperatures of the ewes, but minor differences in the surface temperatures of the floors. Solid floors without saw dust gave the highest heat loss to floor with the measuring method used, and straw gave the lowest heat loss to floor. There was little difference between floor of solid wood and rubber mat, without and with saw dust. Composite material gave the highest and plastic slatted floor the lowest heat loss to floor of the draining floor types. Solid floors with saw dust gave a heat loss to floor which was similar to expanded metal. The results of the choice test showed that the ewes had a clear preference for solid floors to draining floors since they were standing, walking and resting more on solid floor than on draining floor through the whole period of the experiment. Lying time in each of the different pens showed that the ewes lie resting significantly more on wooden floor or rubber mat than on expanded metal, composite and plastic slatted floors. Furthermore, the ewes showed a tendency for lying more on rubber mats than on wooden floor in the pen with just solid floors. There were various temperatures throughout the experiment, and the ewes laid less, stood and walked more, ate and drank more, and had more body contact at the lowest ambient temperatures. In the ten coldest days, they were laying significantly less in pens with only draining floors than in pens with access to solid floor.

Formålet med masteroppgaven var å undersøke unge søyers preferanser for ulike golvtyper ved hjelp av valgforsøk ved lave temperaturer. I tillegg ble golvtypenes varmetekniske egenskaper undersøkt. Valgforsøket ble gjennomført hos Norsk Institutt for Bioøkonomi i Tjøtta med 30 unge, uparede søyer av rasen Norsk Kvit Sau, fra 7. januar 2016 til 28. januar 2016, 6 til 9 uker etter klipping av søyene. Søyene ble delt inn i 10 grupper med tre søyer i hver gruppe, og gruppene ble rotert mellom 10 binger med to golvtyper per binge. Totalt fem golvtyper ble tester parvis: kompositt, strekkmetall, plastspaltegolv, tett golv av tre og tett golv av gummimatte. Det ble gjort atferdsobservasjoner, og dataene ble deretter analysert ved hjelp av en mixed modell i SAS. Det ble gjort målinger av overflatetemperaturer på golv og dyr, målinger av varmetap til golv for de fem golvtypene, samt for tregolv og gummimatte med sagflis, og for halm (på tregolv). Det var stor variasjon i søyenes overflatetemperaturer, men små forskjeller i overflatetemperaturer for golvtypene. Tette golv uten strø ga høyest varmetap til golv med målingen som ble utført, og halm ga lavest varmetap til golv. Det var liten forskjell mellom tregolv og gummimatte, både uten og med sagflis. Av de drenerende golvtypene ga kompositt høyest og plastspaltegolv lavest varmetap til golv. Tette golv med sagflis ga et varmetap til golv som var likt som for strekkmetall. Resultatene fra valgforsøket viste at søyene hadde en klar preferanse for tett golv fremfor drenerende golv ved at de både sto, gikk og lå mer på tett golv enn drenerende golv gjennom hele forsøket. Liggetid i hver av de ulike bingene viste at søyene lå signifikant mer på tregolv og gummimatte fremfor strekkmetall, kompositt og plastspaltegolv. Dessuten viste søyene en tendens til å ligge mer på gummimatte enn tregolv i bingen med kun tett golv. Det var ulike temperaturer gjennom forsøket, og søyene lå mindre, sto og gikk mer, spiste og drakk mer, og hadde mer kroppskontakt ved de laveste omgivelsestemperaturene. De ti kaldeste døgnene lå de signifikant mindre i bingene med kun drenerende golv enn i bingene med tilgang til tett golv.

M-HV

Country
Norway
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Keywords

VDP::Agriculture and fishery disciplines: 900::Agriculture disciplines: 910::Livestock breeding, rearing, reproduction: 912, gulv, søye, etologi, husdyr, golv, sau, termoregulering

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
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