The daily and within-day variation in udder temperature was monitored in dairy cows (n = 10) using infrared thermography (IRT). The initial assessment and prediction of udder surface temperature variation would hopefully form the basis for future development of an early detection method for mastitis. Our initial objective was to determine the magnitude and pattern of udder temperature variation. To accomplish this, we measured daily fluctuations in udder temperature and the influence of environmental factors upon these values in non-mastitic cows. Udder temperature rose significantly after an exercise period (P < 0.05). Withinday monitoring of udder temperature demonstrated there was a distinct circadian rhythm. Lag regression analysis showed that previous daily udder temperatures together with environmental temperature parameters could successfully predict current udder temperature with a high degree of accuracy. The variation between predicted and actual udder temperature was within the detectable range for an inflammatory response. Infrared thermography shows promise in its application if coupled with environmental temperature monitoring as an early detection method for mastitis.Key words: Thermography, dairy cattle, environment, temperature Berry, R. J., Kennedy, A. D., Scott, S. L., Kyle, B. L. et Schaefer, A. L. 2003. Détermination de la variation quotidienne de la température à la surface du pis des vaches laitières par thermographie infrarouge : utilité potentielle pour le dépistage de la mammite. Can. J. Anim. Sci. 83: 687-693. Les auteurs ont examiné la variation quotidienne et intra-quotidienne de la température du pis des vaches laitières (n = 10) par thermographie infrarouge (TI). En effet, une première évaluation et la prévision subséquente de la température à la surface du pis pourraient aboutir à l'élaboration d'une technique de dépistage précoce de la mammite. L'objectif initial consistait à établir l'ampleur d'une telle variation et ses particularités. Pour cela, les auteurs ont mesuré les fluctuations quotidiennes de la température du pis et l'influence de divers facteurs environnementaux chez des vaches ne souffrant pas de la mammite. La température du pis grimpe sensiblement (P < 0,05) après une période d'activité. Dans la journée, elle suit un rythme nettement circadien. L'analyse de régression avec retard indique qu'on pourrait utiliser la température du jour antérieur et les paramètres de la température ambiante pour prévoir la température courante avec une grande précision. L'écart entre la température prévue du pis et la température réelle est assez faible pour qu'on détecte une inflammation. La TI est une technique prometteuse pour le dépistage précoce de la mammite si on la combine à la surveillance des paramètres de la température ambiante.
Single or chronic daily (30 d) doses of 14C-aniline (an aromatic amine) were administered to dairy cattle, swine and laying pullets to determine the amount of an ingested synfuel-related chemical that would remain in consumable animal products. The 14C-residues were found in muscle, liver, other edible organs and fat, as well as in milk and eggs. The predominant site of deposition in acute- and chronic-exposed pullets was kidney, followed by internal yolk (immature ovum of ovary) and then liver. Egg yolk was the major site of 14C-radioactivity in whole eggs. Liver, then kidney, were the major sites of deposition in acutely exposed swine; when chronically exposed, only liver showed preferential deposition with other tissues surveyed yielding similar concentration values. Dairy cattle yielded tissue distribution patterns similar to chronic swine. Within 8 h after an acute exposure, 14C-residue was detected in milk which reached its maximum at 24 to 32 h. Our data demonstrate that derived concentration values of 14C-residue in tissues was dependent upon the species studied as well as on the mode of exposure, acute versus chronic. Although the concentration values were variable, sufficient amounts of 14C-aniline and (or) its metabolites were found in consumable products.
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