| Grant number: | 12/03191-9 |
| Support Opportunities: | Regular Research Grants |
| Start date: | June 01, 2012 |
| End date: | January 31, 2014 |
| Field of knowledge: | Agronomical Sciences - Veterinary Medicine - Preventive Veterinary Medicine |
| Principal Investigator: | Cecília José Veríssimo |
| Grantee: | Cecília José Veríssimo |
| Host Institution: | Instituto de Zootecnia. Agência Paulista de Tecnologia dos Agronegócios (APTA). Secretaria de Agricultura e Abastecimento (São Paulo - Estado). Nova Odessa , SP, Brazil |
Abstract
Cattle with short hair are usually less infested by tick ticks than those of long hair. The objective of this work is to evaluate the Rhipiciphalus (Boophilus) microplus tick infestation and the heat tolerance of susceptible cattle which had their coat clipped. It will be used 12 Holstein black and white cattle of the same sex and category, which will be subject to three experiments: 1) half of the animals will be sheared on one side and all will be artificially infested with 10,000 tick larvae, with counting of tick females greater than 4.5 mm on both sides 21 days after the infestation; 2) these same animals will be subjected to natural infestation of ticks for 8 weeks (8 weekly assessments of the number of ticks greater than 4.5 mm); 3) animals shorn on one side will be their hair coat clipped on the other side, forming a treatment with sheared cattle and other not, and they will be subjected to heat tolerance test and measured the sweating rate. During the third experiment will be collected saliva for evaluation of cortisol as a way to monitor the animals' stress. Parallel observations that would be good for explaining the results, such as skin temperature (unshorn and shorn sides), hair length, rectal temperature, respiratory rate, and meteorological data will be recorded during execution of the experiments. (AU)
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