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Reproductive developmental dynamics during the early and intermediate prepuberal periods in Nelore breed (Bos indicus) calves

Taynan Stonoga Kawamoto, João Henrique Moreira Viana, View ORCID ProfileMaurício Machaim Franco, Otávio Augusto Costa de Faria, View ORCID ProfileAndrei Antonioni Guedes Fidelis, View ORCID ProfileRicardo Alamino Figueiredo
doi: https://doi.org/10.1101/2021.12.02.470948
Taynan Stonoga Kawamoto
1Department of Veterinary, Federal University of Uberlandia, Uberlandia, MG, Brazil
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João Henrique Moreira Viana
2Animal Reproduction Laboratory, Embrapa, Genetic Resources and Biotechnology, Brasília, DF, Brazil
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  • For correspondence: henrique.viana@embrapa.br
Maurício Machaim Franco
2Animal Reproduction Laboratory, Embrapa, Genetic Resources and Biotechnology, Brasília, DF, Brazil
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Otávio Augusto Costa de Faria
3Department of Veterinary, University of Brasilia, Brasília, DF, Brazil
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Andrei Antonioni Guedes Fidelis
3Department of Veterinary, University of Brasilia, Brasília, DF, Brazil
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Ricardo Alamino Figueiredo
2Animal Reproduction Laboratory, Embrapa, Genetic Resources and Biotechnology, Brasília, DF, Brazil
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  • ORCID record for Ricardo Alamino Figueiredo
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Abstract

The demand for calves as oocyte donors for in vitro embryo production is growing. However, Bos indicus have a late puberty, and some aspects of the reproductive physiology during the prepubertal period remain unclear. We characterized endocrine and morpho-functional reproductive features in Nelore calves (n=8) at 2-5 (early prepubertal period, EPP) and from 8-11 months old (mo., intermediate prepubertal period, IPP). The calves’ ovaries and uterus were B-mode transrectal ultrasonography examined, and blood samples were collected every second week. The antral follicles number and size, and ovarian and uterine horn diameters, were recorded, and plasma FSH and LH concentrations were measured (RIA). Non-pregnant, non-lactating cyclic Nelore cows (n=8) were used as controls for endocrine endpoints. Somatic development was monitored by monthly weighing, and 3D scanning of the rump area. The somatic and endocrine endpoints were compared within and between EPP and IPP, and between each period and control cows. Associations were determined by the Spearman correlation method, and the developmental rates were determined by non-linear regression. All morphological endpoints, except antral follicle count, increased (P < 0.001) from the EPP to the IPP. However, within each period differences occurred only at EPP. During the EPP LH and FSH plasma concentrations were similar (P > 0.05), whereas during the IPP LH was lower (P < 0.05) and FSH was higher (P < 0.001) than control cows. The EPP calves showed moderate to high positive correlations among ovarian, uterine, and somatic endpoints. Conversely, the IPP such correlations were mostly weak. In summary, distinct ovarian activity and development patterns of primary and secondary sexual characteristics occurred in Nelore calves at 2-5 mo compared to 8-11 mo.

Competing Interest Statement

The authors have declared no competing interest.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted December 02, 2021.
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Reproductive developmental dynamics during the early and intermediate prepuberal periods in Nelore breed (Bos indicus) calves
Taynan Stonoga Kawamoto, João Henrique Moreira Viana, Maurício Machaim Franco, Otávio Augusto Costa de Faria, Andrei Antonioni Guedes Fidelis, Ricardo Alamino Figueiredo
bioRxiv 2021.12.02.470948; doi: https://doi.org/10.1101/2021.12.02.470948
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Reproductive developmental dynamics during the early and intermediate prepuberal periods in Nelore breed (Bos indicus) calves
Taynan Stonoga Kawamoto, João Henrique Moreira Viana, Maurício Machaim Franco, Otávio Augusto Costa de Faria, Andrei Antonioni Guedes Fidelis, Ricardo Alamino Figueiredo
bioRxiv 2021.12.02.470948; doi: https://doi.org/10.1101/2021.12.02.470948

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