Influência do ambiente na qualidade de oócitos, produção in vitro de embriões e na taxa de prenhez em taurinos, zebuínos e adaptados
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2020-03-04
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Universidade Federal de Goiás
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This longitudinal observational study was developed with the objective of evaluating the influence of temperature, humidity and thermal stress, on the quantity and quality of oocytes, embryos and their relationship with the conception rate in different breeds of Bos taurus and Bos indicus species and its compounds adapted to the tropical climate. The temperature and humidity index (THI) was used to study the influence of the environment. A database was used, consisting of 10,489 follicular aspirations with production of 210,120 structures, 168,203 of which are viable and 41,917 not viable, totaling the production of 62,467 (37.14%) embryos and 52,852 (31.43%) transferred structures. For in vitro fertilization of aspirated oocytes, a total of 641 bulls were used in the period from January 2006 to December 2016, analyzing the dry and rainy seasons in the state of Goiás. The results showed differences (P <0.05) in the evaluated characteristics with superior conception rate in the rainy season 37.6 ± 0.4 versus drought 32.4 ± 05. Regarding the production of oocytes, the Zebu cattle showed superiority (6.6 ± 0.1) to the taurino (3.6 ± 0.4) in the studied stations, with the adapted intermediate ones (5.5 ± 0.2). The results of the conception rates showed an influence of the environment on the quality of the recipients, 37.2 ± 0.5 for the Zebu, 48.1 ± 3.0 for the taurino and 37.8 ± 1.2 for the adapted ones. Embryo production was higher in the rainy period than in the drought period (P <0.05). Bos indicus cows showed better response both in relation to the quantity and quality of oocytes obtained and in the production of embryos after in vitro fertilization, also showing the importance of selecting recipients to obtain better results when using embryos from Bos taurus animals.
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NAVES, A. C. Influência do ambiente na qualidade de oócitos, produção in vitro de embriões e na taxa de prenhez em taurinos, zebuínos e adaptados. 2020. 39 f. Tese (Doutorado em Zootecnia) - Universidade Federal de Goiás, Goiânia, 2020.