Short communication: Heat stress does not affect induced luteolysis in Holstein cows

Autor(es):Mostrar menos -

Mogollon, H. D. G. ^[1] ; Ferrazza, R. A. ^[1] ; Vallejo, V. H. ^[1] ; Destro, F. C. ^[1] ; Ochoa, J. C. ^[1] ; Nogueira, C. ^[1] ; Carvalho, R. F. ^[2] ; Moraes, L. N. ^[3] ; Rizzoto, G. ^[4] ; Sartori, R. ^[5] ; Wiltbank, M. C. ^[6] ; Ferreira, J. C. P. ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Sch Vet Med & Anim Sci, Dept Anim Reprod & Vet Radiol, Rua Prof Dr Walter Mauricio Correa S-N, BR-86868 Botucatu, SP - Brazil

^[2] Univ Sao Paulo State UNESP, Inst Biosci, Dept Morphol, R Prof Dr Antonio Celso Wagner Zanin 250, BR-18618681 Botucatu, SP - Brazil

^[3] Sao Paulo State Univ UNESP, Sch Agr, BR-1861004 Botucatu, SP - Brazil

^[4] Univ Calgary, Fac Vet Med, Dept Prod Anim Hlth, Calgary, AB T3R 1J3 - Canada

^[5] Univ Sao Paulo, Luiz de Queiroz Coll Agr ESALQ, Dept Anim Sci, Av Padua Dias 11, BR-13418900 Piracicaba, SP - Brazil

^[6] Univ Wisconsin, Dept Anim & Dairy Sci, Madison, WI 53706 - USA

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF DAIRY SCIENCE; v. 103, n. 6, p. 5629-5633, JUN 2020.
• Citações Web of Science: 0

Resumo

Heat stress (HS) has deleterious effects on bovine reproduction, including prolongation of the luteal phase in Holstein cows, perhaps due to compromised luteolysis. The objective was to characterize effects of HS on luteolytic responses of nonlactating Holstein cows given 25 or 12.5 mg of PGF(2 alpha) on d 7 of the estrous cycle. Cows were randomly distributed into 2 environments: thermoneutral (n = 12; 25 degrees C) or HS (n = 12; 36 degrees C). In each environment, cows were treated with 2 mL of saline, 25 or 12.5 mg of PGF(2 alpha) (n = 4 cows per group). The HS environment induced a significant increase in rectal temperature and respiratory rate compared with the thermoneutral environment. Heat stress did not have significant effects on luteolytic responses or circulating progesterone concentrations. Rapid and complete luteolysis occurred in all cows given 25 mg of PGF(2 alpha) and in 4 of 8 cows given 12.5 mg; the other 4 cows given 12.5 mg had partial luteolysis, with circulating progesterone concentrations initially suppressed, but subsequently rebounding. Therefore, we conclude that HS does not change corpus luteum sensitivity to PGF(2 alpha). (AU)

• Processo FAPESP: 12/18297-7 - Efeito do estresse térmico sobre o desenvolvimento folicular e luteólise em vacas Holandesa, papel do LH durante a luteólise induzida e caracterização da sensibilidade luteínica à PGF2 ao longo do ciclo estral
• Beneficiário: João Carlos Pinheiro Ferreira
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 11/20449-7 - Papel do LH durante a luteólise induzida e caracterização da sensibilidade luteínica à PGF2alpha ao longo do ciclo estral e durante o tratamento com IFNt
• Beneficiário: Eduardo Trevisol
• Modalidade de apoio: Bolsas no Brasil - Doutorado