Results
There is certainly a critical relationship out of reproduce, sex, years and you can live weight on the tick burden off Bos taurus Colombian cows types. The specific environment criteria of every agroecosystem possess inspired brand new differences observed in the fresh distribution out of presses on the body out-of cattle. A higher thermal soreness was with the a higher tick load for the cows you to definitely perhaps has actually a reduced quantity of adaptability, and this dating would-be personally influenced by a number of the characteristics that have an influence on the thermal comfort of your creature. Yet not, so it telecommunications anywhere between tick weight and you can ecological heat fret could be impacted by services of your own agroecological area alone, the breed, the latest genetic opposition of the person tick additionally the thermal flexibility out of cattle.
Colombian cattle types have been brought to the newest Americas over 500 years back. Such breeds has actually a finest reproductive overall performance , large chicken quality and have a particular resistance to ailment particularly due to the fact brucellosis . New delivery ones breeds is impacted by the most varied agroecological conditions used in Colombia. Numerous research shows that as well as the environment and you may environment types of, other variables such as the breed, years and sex of one’s dogs likewise have a serious impression to the tick burden in almost any cattle populations [8, 15,sixteen,17,18]. When you look at the Colombia, brand new available literary works with the cows ticks address new biological and you will environmental areas of these types of parasitic organisms as well as geographical shipment . Yet not, only a few studies have shown the latest tick weight with the cattle remaining around absolute requirements, and these didn’t account for effects including breed, ages and you may sex of dogs otherwise climate details . Hence, along with view of the latest paucity of data towards points impacting tick infestations, the purpose of this check out was to define the fresh tick burdens within the Colombian cattle types in order to evaluate the matchmaking ranging from tick infestation profile as well as heat adaptability, having fun with both AI as well as the THI, less than warm criteria.
Climatic parameters as well as heat worry indices
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 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).
I discover a serious relationship anywhere between many years and you will tick burden within the the brand new Colombian types analyzed. Numerous studies have located a life threatening aftereffect of the age of cows to the tick weight [8, 16, 17, 21]. Rehman ainsi que al. and you can Lorusso mais aussi al. discover less tick burden in calves compared to earlier cattle, and Asmaa ainsi que al. noticed increased infestation rates inside more mature animals various ruminant animals species.
Ecological change features an optimistic otherwise bad affect the brand new psychological temperature controls mechanisms of cows and you can probably to the tick weight of those dogs . The higher tick weight included in SM and you can ROMO animals with a keen AI > dos kissbrides.com iyi site do imply that cattle with a state regarding lower adaptability, expressed by experience of a thermal serious pain, provides increased awareness becoming plagued of the presses. The better thermal adaptation of some animals (that have a keen AI
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