Findings
You will find a significant association out-of reproduce, sex, many years and you may real time lbs to the tick load out-of Bos taurus Colombian cows breeds. This environmental standards of every agroecosystem may have influenced this new differences present in the newest delivery regarding ticks on your body out of cattle. A top thermal problems try with the increased tick load for the cows you to definitely maybe have a lower life expectancy number of versatility, and therefore dating is personally impacted by a few of the qualities with an impact on the brand new thermal spirits of one’s creature. However, which telecommunications ranging from tick weight and ecological temperatures be concerned was influenced by services of your own agroecological part in itself, new reproduce, the hereditary opposition of the person tick therefore the thermal versatility from cows.
Colombian cows types have been brought to the new Americas over 500 years ago. These breeds keeps a maximum reproductive overall performance , higher animal meat top quality and also a certain resistance to disorder for example as brucellosis . New shipment of these types are influenced by brand new most varied agroecological criteria included in Colombia. Numerous research shows you to definitely in addition to the climate and you will environment kind of, other factors for instance the reproduce, ages and you will sex of one’s dogs also have a life threatening effect for the tick burden in various cows communities [8, fifteen,16,17,18]. Within the Colombia, the brand new available literature to your cows ticks tackles brand new biological and you can environment aspects of these types of parasitic organisms and its geographical shipping . However, not all studies have shown the tick burden into the cows left under natural standards, that failed to be the cause of effects eg breed, many years and you can sex of animals or climate parameters . Thus, along with view of this new paucity of information on points impacting tick infestations, the aim of this try out were to characterize the fresh tick burdens in Colombian cattle types and to assess the dating anywhere between tick infestation profile and heat flexibility, using the AI therefore the THI, below tropical conditions.
Climatic variables and heat stress indicator
An overall effect of AI was observed within breeds (F(cuatro,1528) = 3.25, P = 0.0115), with higher tick burdens observed when the AI was higher than 2, although this effect was significant only in the SM (t(1528) = -2.43, P = 0.0153) and ROMO (t(1528) = -2.62, P = 0.0088) breeds. Tick burden was significantly different between breeds for both AI categories (Table 4 and Fig. 5). When the AI values were lower or equal to 2, CCC individuals showed a higher tick burden than all other breeds (30.8 ± 2.6), and a higher tick burden than ROMO and BON when the AI was higher than 2. Likewise, ROMO had a lower tick burden than SM and CCC breeds in both scenarios (AI hepsi Г‡ek kД±zlar sД±cak lower or higher than 2), while BON showed a lower tick burden compared with SM and CCC only when AI was higher than 2 (19.3 ± 2.2).
We found a critical correlation between years and you will tick weight from inside the the fresh new Colombian types evaluated. Numerous studies have discover a life threatening aftereffect of the age of cattle on tick load [8, sixteen, 17, 21]. Rehman ainsi que al. and Lorusso ainsi que al. discover a lowered tick weight from inside the lower legs as compared to more mature cows, and you can Asmaa ainsi que al. observed a higher infestation speed for the older pet of various ruminant livestock species.
Ecological change keeps a confident otherwise negative affect the physiological heat control systems of cattle and you will potentially to your tick burden of them dogs . The greater tick load utilized in SM and you may ROMO pet which have an AI > 2 carry out indicate that cows with your state of all the way down versatility, indicated of the exposure to a good thermal soreness, has actually a top sensitiveness to get infested because of the ticks. The greater thermal adaptation of some dogs (with an AI