NDLI: Dynamics of the Reproductive Changes and Acquisition of Oocyte Competence in Nelore (Bos taurus indicus) Calves during the Early and Intermediate Prepubertal Periods

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Dynamics of the Reproductive Changes and Acquisition of Oocyte Competence in Nelore (Bos taurus indicus) Calves during the Early and Intermediate Prepubertal Periods

Content Provider	MDPI
Author	Kawamoto, Taynan Stonoga Viana, João Henrique Moreira Pontelo, Thais Preisser Franco, Maurício Machaim de Faria, Otávio Augusto Costa Fidelis, Andrei Antonioni Guedes Vargas, Luna Nascimento Figueiredo, Ricardo Alamino
Copyright Year	2022
Description	The purpose of this study was to characterize the reproductive physiology, oocyte competence, and chromatin compaction in Nelore calves in the early-prepubertal period (EPP) and the intermediate-prepubertal period (IPP). Calves aged 2–5 (EPP) and 8–11 months old (IPP) were assigned to Trial 1 (morpho-physiological–endocrine evaluations, n = 8) or Trial 2 (oocyte donors, n = 8) vs. the respective control groups of cows (n = 8, each). All morphological endpoints, except the antral follicle count, increased from the EPP to the IPP. The EPP LH-FSH plasma concentrations were similar to cows, whereas LH was lower and FSH was higher in the IPP than in cows. . Cows produced more Grade I (12.9% vs. 4.1% and 1.7%) and fewer Grade III COC (30.1% vs. 44.5% and 49.0%) than the EPP and IPP calves, respectively. The IPP calves’ oocyte diameter was similar to those from cows but greater than those from EPP females (124.8 ± 8.5 and 126.0 ± 7.5 μm vs. 121.3 ± 7.5 μm, respectively). The expression of the chromatin compaction-related gene HDAC3 was downregulated in calves. The proportion of the blastocyst rate to the controls was lower in EPP than in IPP calves (43.7% vs. 78.7%, respectively). Progressive oocyte competence was found during the prepubertal period, which can help to decide whether to recover oocytes from calves.
Starting Page	2137
e-ISSN	20762615
DOI	10.3390/ani12162137
Journal	Animals
Issue Number	16
Volume Number	12
Language	English
Publisher	MDPI
Publisher Date	2022-08-20
Access Restriction	Open
Subject Keyword	Animals Reproductive Biology Reproductive Physiology Rump Development Lopu Oocyte Gene Expression Ivep Embryo
Content Type	Text
Resource Type	Article

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