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Characteristics of Trailer Thermal Environment during Commercial Swine Transport Managed under U.S. Industry Guidelines.

Xiong Y, Green A, Gates RS - Animals (Basel) (2015)

Bottom Line: Transport is a critical factor in modern pork production and can seriously affect swine welfare.Recommended bedding, boarding and water application were sufficient in this range.Observations indicate that arranging boarding placement may alter the ventilation patterns inside the trailer.

View Article: PubMed Central - PubMed

Affiliation: Agricultural and Biological Engineering, University of Illinois at Urbana-Champaign, 1304 W. Pennsylvania Ave, Urbana, IL 61801, USA. yxiong5@illinois.edu.

ABSTRACT
Transport is a critical factor in modern pork production and can seriously affect swine welfare. While previous research has explored thermal conditions during transport, the impact of extreme weather conditions on the trailer thermal environment under industry practices has not been well documented; and the critical factors impacting microclimate are not well understood. To assess the trailer microclimate during transport events, an instrumentation system was designed and installed at the central ceiling level, pig level and floor-level in each of six zones inside a commercial swine trailer. Transport environmental data from 34 monitoring trips (approximately 1-4 h in duration each) were collected from May, 2012, to February, 2013, with trailer management corresponding to the National Pork Board Transport Quality Assurance (TQA) guidelines in 31 of these trips. According to the TQA guidelines, for outdoor temperature ranging from 5 °C (40 °F) to 27 °C (80 °F), acceptable thermal conditions were observed based on the criteria that no more than 10% of the trip duration was above 35 °C (95 °F) or below 0 °C (32 °F). Recommended bedding, boarding and water application were sufficient in this range. Measurements support relaxing boarding guidelines for moderate outdoor conditions, as this did not result in less desirable conditions. Pigs experienced extended undesirable thermal conditions for outdoor temperatures above 27 °C (80 °F) or below 5 °C (40 °F), meriting a recommendation for further assessment of bedding, boarding and water application guidelines for extreme outdoor temperatures. An Emergency Livestock Weather Safety Index (LWSI) condition was observed inside the trailer when outdoor temperature exceeded 10 °C (50 °F); although the validity of LWSI to indicate heat stress for pigs during transport is not well established. Extreme pig surface temperatures in the rear and middle zones of the trailer were more frequently experienced than in the front zones, and the few observations of pigs dead or down upon arrival were noted in these zones. Observations indicate that arranging boarding placement may alter the ventilation patterns inside the trailer.

No MeSH data available.


Related in: MedlinePlus

Trailer schematic. The top and bottom plan view of the trailer illustrates the horizontal distribution of sensors within each zone, and the left-side elevation view of the six zones illustrates the vertical distribution of sensors used for pig-level air temperature, surface temperature and zone-centered temperature/relative humidity.
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animals-05-00226-f001: Trailer schematic. The top and bottom plan view of the trailer illustrates the horizontal distribution of sensors within each zone, and the left-side elevation view of the six zones illustrates the vertical distribution of sensors used for pig-level air temperature, surface temperature and zone-centered temperature/relative humidity.

Mentions: A newly-fabricated commercial swine trailer (Model No. PSDCL-420P with customer-selected features, Wilson Trailer Company, Sioux City, IA, USA) and a loading capacity of 34,020 kg (equivalent to 170–175 market-weight pigs) was used (Figure 1). The trailer overall dimensions were 15.84 m long × 2.50 m wide × 3.50 m high (from the top to the drop-center). Large (15 × 25 cm) and small (7 × 14 cm) side-openings were punched identically on the trailer’s outside surface to provide air circulation. The internal trailer space was divided into two levels with three zones on each level (numbered from 1 to 3 on the top level and 4 to 6 on the bottom level, from the front to the back, to identify positions in the trailer).


Characteristics of Trailer Thermal Environment during Commercial Swine Transport Managed under U.S. Industry Guidelines.

Xiong Y, Green A, Gates RS - Animals (Basel) (2015)

Trailer schematic. The top and bottom plan view of the trailer illustrates the horizontal distribution of sensors within each zone, and the left-side elevation view of the six zones illustrates the vertical distribution of sensors used for pig-level air temperature, surface temperature and zone-centered temperature/relative humidity.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4494411&req=5

animals-05-00226-f001: Trailer schematic. The top and bottom plan view of the trailer illustrates the horizontal distribution of sensors within each zone, and the left-side elevation view of the six zones illustrates the vertical distribution of sensors used for pig-level air temperature, surface temperature and zone-centered temperature/relative humidity.
Mentions: A newly-fabricated commercial swine trailer (Model No. PSDCL-420P with customer-selected features, Wilson Trailer Company, Sioux City, IA, USA) and a loading capacity of 34,020 kg (equivalent to 170–175 market-weight pigs) was used (Figure 1). The trailer overall dimensions were 15.84 m long × 2.50 m wide × 3.50 m high (from the top to the drop-center). Large (15 × 25 cm) and small (7 × 14 cm) side-openings were punched identically on the trailer’s outside surface to provide air circulation. The internal trailer space was divided into two levels with three zones on each level (numbered from 1 to 3 on the top level and 4 to 6 on the bottom level, from the front to the back, to identify positions in the trailer).

Bottom Line: Transport is a critical factor in modern pork production and can seriously affect swine welfare.Recommended bedding, boarding and water application were sufficient in this range.Observations indicate that arranging boarding placement may alter the ventilation patterns inside the trailer.

View Article: PubMed Central - PubMed

Affiliation: Agricultural and Biological Engineering, University of Illinois at Urbana-Champaign, 1304 W. Pennsylvania Ave, Urbana, IL 61801, USA. yxiong5@illinois.edu.

ABSTRACT
Transport is a critical factor in modern pork production and can seriously affect swine welfare. While previous research has explored thermal conditions during transport, the impact of extreme weather conditions on the trailer thermal environment under industry practices has not been well documented; and the critical factors impacting microclimate are not well understood. To assess the trailer microclimate during transport events, an instrumentation system was designed and installed at the central ceiling level, pig level and floor-level in each of six zones inside a commercial swine trailer. Transport environmental data from 34 monitoring trips (approximately 1-4 h in duration each) were collected from May, 2012, to February, 2013, with trailer management corresponding to the National Pork Board Transport Quality Assurance (TQA) guidelines in 31 of these trips. According to the TQA guidelines, for outdoor temperature ranging from 5 °C (40 °F) to 27 °C (80 °F), acceptable thermal conditions were observed based on the criteria that no more than 10% of the trip duration was above 35 °C (95 °F) or below 0 °C (32 °F). Recommended bedding, boarding and water application were sufficient in this range. Measurements support relaxing boarding guidelines for moderate outdoor conditions, as this did not result in less desirable conditions. Pigs experienced extended undesirable thermal conditions for outdoor temperatures above 27 °C (80 °F) or below 5 °C (40 °F), meriting a recommendation for further assessment of bedding, boarding and water application guidelines for extreme outdoor temperatures. An Emergency Livestock Weather Safety Index (LWSI) condition was observed inside the trailer when outdoor temperature exceeded 10 °C (50 °F); although the validity of LWSI to indicate heat stress for pigs during transport is not well established. Extreme pig surface temperatures in the rear and middle zones of the trailer were more frequently experienced than in the front zones, and the few observations of pigs dead or down upon arrival were noted in these zones. Observations indicate that arranging boarding placement may alter the ventilation patterns inside the trailer.

No MeSH data available.


Related in: MedlinePlus