Livestock-Forest integrated system attenuates deleterious heat stress effects in bovine oocytes.

Autor: Oliveira CS; Embrapa Dairy Cattle, 610 Eugenio do Nascimento Ave., Juiz de Fora, MG 36038-330, Brazil., Dias HRS; Embrapa Dairy Cattle, 610 Eugenio do Nascimento Ave., Juiz de Fora, MG 36038-330, Brazil; Universidade Federal Fluminense - UFF, Faculdade de Veterinária, Rua Vital Brazil Filho, 64, Santa Rosa, Niterói, RJ 24230-340, Brazil., Camargo AJDR; Agricultural Research Company of the Rio de Janeiro State (PESAGRO RIO), São Boa Ventura Av., 770, Fonseca, Niterói, Rio de Janeiro 24120-19, Brazil., Mourão A; Agricultural Research Company of the Rio de Janeiro State (PESAGRO RIO), São Boa Ventura Av., 770, Fonseca, Niterói, Rio de Janeiro 24120-19, Brazil., Feuchard VLDS; Embrapa Dairy Cattle, 610 Eugenio do Nascimento Ave., Juiz de Fora, MG 36038-330, Brazil., Muller MD; Embrapa Dairy Cattle, 610 Eugenio do Nascimento Ave., Juiz de Fora, MG 36038-330, Brazil., Brandão FZ; Universidade Federal Fluminense - UFF, Faculdade de Veterinária, Rua Vital Brazil Filho, 64, Santa Rosa, Niterói, RJ 24230-340, Brazil., Nogueira LAG; Universidade Federal Fluminense - UFF, Faculdade de Veterinária, Rua Vital Brazil Filho, 64, Santa Rosa, Niterói, RJ 24230-340, Brazil., Verneque RDS; Embrapa Dairy Cattle, 610 Eugenio do Nascimento Ave., Juiz de Fora, MG 36038-330, Brazil., Saraiva NZ; Embrapa Dairy Cattle, 610 Eugenio do Nascimento Ave., Juiz de Fora, MG 36038-330, Brazil., Camargo LSA; Embrapa Dairy Cattle, 610 Eugenio do Nascimento Ave., Juiz de Fora, MG 36038-330, Brazil.
Jazyk: angličtina
Zdroj: Animal reproduction science [Anim Reprod Sci] 2024 Sep; Vol. 268, pp. 107568. Date of Electronic Publication: 2024 Jul 26.
DOI: 10.1016/j.anireprosci.2024.107568
Abstrakt: Global warming poses significant challenges to the fertility of tropical dairy cattle. One promising approach to mitigate heat stress effects on reproductive function and reduce the carbon footprint is the use of integrated livestock-forest (ILF) systems. The aim of this study was to investigate the effects of two different systems, namely Full Sun (FS) and ILF, on maternal hyperthermia and oocyte quality of Holstein and Girolando heifers during the tropical summer season. The temperature-humidity index (THI) data revealed intense heat stress during the experiment. Both the system (P<0.01) and the breed (P<0.01) factors had a significant impact on vaginal temperature, being hyperthermia more pronounced in the FS system and in the Holstein breed. Over the five time points collected at a 33-day interval, we observed distinct patterns for ILF (P=0.65) and FS (P<0.001) systems, suggesting an adaptive response in animals kept in FS systems. Furthermore, oocyte quality assessment revealed an effect of the system for oocyte diameter (P<0.001) and levels of IGFBP2 (P<0.001), and caspase 3 levels showed a decrease in ILF compared to FS for both Holstein (P<0.001) and Girolando (P<0.001) breeds. Collectively, these parameters indicate that oocyte quality during the summer months was superior in animals maintained in the ILF system. In conclusion, the ILF system demonstrated promising results in attenuating maternal hyperthermia and mitigating its effects on oocyte quality. Additionally, our observations suggest that animals in the FS system may exhibit an adaptive response to heat stress.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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