Two-trait random regression model to estimate the genetic association of scrotal circumference with female reproductive performance in Nelore cattle

Theriogenology
Mário Luiz SantanaJ B S Ferraz

Abstract

In an attempt to determine when scrotal circumference (SC) could be a reasonable indicator of female reproductive performance, a series of two-trait random regression model (regression for SC on age at measurement) using Gibbs sampling was applied to field data of Nelore cattle raised in a tropical environment. The female traits evaluated were age at first calving (AFC), first calving interval (FCI), heifer pregnancy (HP), and stayability (STAY). The posterior means of heritability of female traits ranged from 0.15 for AFC to 0.46 for HP and were about 0.50 for SC. The posterior means of genetic correlations between SC and AFC, FCI, HP, STAY were up to -0.70, -0.25, 0.48, and 0.29, respectively. Genetically, SC could be a reasonable indicator of female puberty (e.g., HP) as long as it is measured at a young age (400-440 days). However, for female reproductive traits measured at an older age (e.g., STAY), SC is merely a modest or even poor indicator. The use of sire expected progeny differences for female reproductive traits will be more effective than the use of expected progeny differences for SC to improve the reproductive performance of female cattle.

References

Mar 21, 2007·Journal of Animal Science·M H Van MelisE Pereira
Sep 22, 2009·Journal of Animal Breeding and Genetics = Zeitschrift Für Tierzüchtung Und Züchtungsbiologie·D A GrossiD P Munari
Mar 23, 2012·Animal : an International Journal of Animal Bioscience·M L SantanaE C Mattos

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Citations

Aug 6, 2016·PloS One·Natalia IranoLucia Galvão de Albuquerque
Dec 23, 2017·Animal : an International Journal of Animal Bioscience·D O SilvaR J Pereira
Mar 2, 2018·PloS One·Jurandy Mauro Penitente-FilhoJosé Domingos Guimarães
Mar 5, 2020·Tropical Animal Health and Production·Laís Costa BritoPaulo Sávio Lopes
Mar 26, 2021·Poultry Science·Bayode O MakanjuolaRaphael A Mrode
Jun 20, 2021·Journal of Applied Genetics·Isis da Costa HermisdorffRaphael Bermal Costa

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