J.A. Loughmiller

An Evaluation of Differences in Mean Body Surface Temperature with Infrared Thermography in Growing Pigs Fed Different Dietary Energy Intake and Concentration

Abstract Loughmiller, J.A., Spire, M.F., Tokach, M.D., Dritz, S.S., Nelssen, J.L., Goodband, R.D. and Hogge, S.B. 2005. An evaluation of differences in mean body surface temperature with infrared thermography in growing pigs fed different dietary energy intake and concentration. J. Appl. Anim. Res., 28: 73–80. Eighty pigs were used to determine the relationships among feed intake or diet composition and mean body surface temperature (MBST). In Exp. 1, 80 castrates (initially 24 kg) were allotted to one of the four feed intake levels [1.4x, 2.50x, 3.8x and ad libitum or 4.7x ME maintenance (MEm)]. Infrared (IR) thermographic images were collected at 0700, 1100 and 1900 h on d 4, 5 and 6. Quadratic effects were observed for ADG and G/F (P<0.05) and linear effects for ADFI (P<0.01) as ME intake increased. Treatment × time interactions were observed for MBST (P<0.01). The interaction was because MBST increased linearly at 0700 and at 1900 h as daily ME intakes increased (P<0.05) but increased quadratically with a plateau at 2.5x MEm at 1100 h (P<0.05). At 0700 h, MBST increased linearly as daily ME intakes increased from 1.5x MEm to ad libitum (P<0.05). In Exp. 2, pigs (initially 40 kg) were fed a common diet, and IR images were collected daily at 0700 h. Average daily gain was dependent upon changes in ADFI, mean body surface heat loss (MBSL) and the natural log of MBST (r2=.38; P<0.01). In Exp. 3, pigs (initially 59 kg) were allotted to diets containing 11.5, 12.6, 13.6 and 14.6 MJ ME/kg. Increasing dietary ME increased ADG, G/F, ME intake, MBST and MBSL (linear, P<0.05). The data indicate that IR thermography can detect MBST changes in pigs caused by changes in dietary intake or energy level. These changes can be detected under more variable environmental conditions than those used with a calorimeter and may be adapted as a low cost noninvasive tool to categorize factors impacting swine thermoenergetics.

Determining the optimal isoleucine:lysine ratio for the 25 to 50 lb pig

This report is brought to you for free and open access by New Prairie Press. It has been accepted for inclusion in Kansas Agricultural Experiment Station Research Reports by an authorized administrator of New Prairie Press. Copyright 1996 Kansas State University Agricultural Experiment Station and Cooperative Extension Service.

Evaluation of various specialty protein sources as replacements for spray-dried animal plasma in diets for segregated early-weaned pigs

This report is brought to you for free and open access by New Prairie Press. It has been accepted for inclusion in Kansas Agricultural Experiment Station Research Reports by an authorized administrator of New Prairie Press. Copyright 1996 Kansas State University Agricultural Experiment Station and Cooperative Extension Service.

Dietary total sulfur amino acid requirement for optimal growth performance and carcass characteristics in finishing gilts

This report is brought to you for free and open access by New Prairie Press. It has been accepted for inclusion in Kansas Agricultural Experiment Station Research Reports by an authorized administrator of New Prairie Press. Copyright 1996 Kansas State University Agricultural Experiment Station and Cooperative Extension Service.

Influence of soybean meal variety and processing temperature on the growth performance of pigs from 25 to 45 lb.

This report is brought to you for free and open access by New Prairie Press. It has been accepted for inclusion in Kansas Agricultural Experiment Station Research Reports by an authorized administrator of New Prairie Press. Copyright 1998 Kansas State University Agricultural Experiment Station and Cooperative Extension Service.

Dietary methionine requirement for optimal growth performance and carcass characteristics in finishing gilts.

This report is brought to you for free and open access by New Prairie Press. It has been accepted for inclusion in Kansas Agricultural Experiment Station Research Reports by an authorized administrator of New Prairie Press. Copyright 1996 Kansas State University Agricultural Experiment Station and Cooperative Extension Service.

Infrared thermography of swine body surface temperatures and associated rectal temperatures during an acute respiratory disease challenge.

An acute Actinobacillus pleuropneumonia challenge was used to study changes in rectal and radiant surface temperatures over 18 h. From 3.5 to 15 h after challenge, rectal temperatures were elevated in challenged pigs compared to nonchallenged controls. From 6 through 18 h after challenge, infrared surface temperature was higher for challenged pigs versus control nonchallenged pigs. Correlation coefficient analysis indicated that surface temperature and rectal temperature were moderately correlated. These results indicate that infrared thermography will detect changes in body surface temperature associated with the acute phase febrile response and has potential as a diagnostic tool for assessing systemic changes in radiant heat production.

Effects of time of introduction and level of soybean meal on performance of segregated early-weaned pigs

This report is brought to you for free and open access by New Prairie Press. It has been accepted for inclusion in Kansas Agricultural Experiment Station Research Reports by an authorized administrator of New Prairie Press. Copyright 1997 Kansas State University Agricultural Experiment Station and Cooperative Extension Service.

Effects of different specialty protein sources on growth performance of starter pigs.

This report is brought to you for free and open access by New Prairie Press. It has been accepted for inclusion in Kansas Agricultural Experiment Station Research Reports by an authorized administrator of New Prairie Press. Copyright 1996 Kansas State University Agricultural Experiment Station and Cooperative Extension Service.

Dietary lysine requirement for optimal growth performance and carcass characteristics of late finishing gilts

This report is brought to you for free and open access by New Prairie Press. It has been accepted for inclusion in Kansas Agricultural Experiment Station Research Reports by an authorized administrator of New Prairie Press. Copyright 1996 Kansas State University Agricultural Experiment Station and Cooperative Extension Service.