Role of progesterone concentrations during early follicular development in beef cattle: I. Characteristics of LH secretion and oocyte quality

Animal Reproduction Science
F M AbreuM L Day

Abstract

Objective was to investigate the effect of different progesterone (P4) concentrations during early follicular development on luteinizing hormone (LH) secretion and oocyte characteristics in beef cows. Primiparous cows (n = 24) were estrous pre-synchronized and follicular ablation was performed (d 0) 6 days following the time of ovulation. At the time of follicular ablation, cows were assigned to either: 1) high P4 treatment - HiP4; a new CIDR was inserted on d 0 to supplement P4 from the existing corpus luteum [CL], or 2) low P4 treatment - LoP4; a previously-used CIDR and two doses of PGF 8 to 12 h apart were given on d 0. Concentrations of P4 were greater (P < 0.01) in the cows of the HiP4 than LoP4 group on d 1.5, 2.5, and 3.5. Peripheral concentrations of E2 were greater (P < 0.05) in the cows of the LoP4 than HiP4 group on d 2.5 and 3.5. Frequency of LH pulses was greater (P <  0.05) in the LoP4 than HiP4 group on d 2.5, but mean LH concentration and pulse amplitude did not differ between treatments. Number of follicles aspirated per cow, total oocytes recovered, recovery rate, percentage of oocytes graded 1 to 3, oocyte diameter, percentage BCB+ oocytes, and relative abundance of oocyte mRNA for FST did not differ (P >  0...Continue Reading

Citations

Jan 27, 2020·Theriogenology·Marcelo Marcondes SenedaFábio Morotti
Mar 29, 2021·Theriogenology·Carlos Antônio de Carvalho FernandesMiller Pereira Palhao
Nov 20, 2021·Animal Science Journal = Nihon Chikusan Gakkaihō·Yanjun ZhangMingjiu Luo
Dec 31, 2021·Reproduction in Domestic Animals = Zuchthygiene·Maria Emilia Franco OliveiraJeferson Ferreira da Fonseca

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