Abstract

GARCIA BRAVO, Luis Adrián et al. Additive and non-additive genetic effects for reproductive traits in a Holstein- Brown Swiss diallel in humid subtropical climate. Rev. mex. de cienc. pecuarias [online]. 2023, vol.14, n.3, pp.556-571.  Epub Sep 08, 2023. ISSN 2448-6698.  https://doi.org/10.22319/rmcp.v14i3.6247.

Crossbreeding allows taking advantage of additive genetic differences between breeds, they also allow making use of heterosis and complementarity. Therefore, it is necessary to generate information on the efficacy of crosses compared to pure breeds under the conditions of interest. The objective was to quantify the impact of additive and non-additive genetic effects for days to first estrus (DFE), days to first service (DFS), days open (DO), services per conception (SPC), calving interval (CI) and gestation length (GL). The productive and genealogical information of females from a diallel between Holstein (HO) and Brown Swiss (BS), a total of 148 cows of the breeds HO (n=43), BS (n=64) and their reciprocal crosses HO-BS (n=20) and BS-HO (n=21), was used. Contrasts were used to estimate individual heterosis and differences between direct genetic effects and between maternal genetic effects based on Dickerson models. The results showed that heterosis and differences between maternal effects were not significant (P>0.05) for any of the traits studied. Differences between direct genetic effects were only important (P<0.05) for SPC and GL. In conclusion, the heterosis generated by the crossbreeding between HO and BS did not influence the reproductive efficiency of females. Maternal effects were not different between HO and BS. Direct genetic effects for SPC and GL favored the BS breed.

Keywords : Bovine; Diallel crossbreeding; Direct genetic effect; Heterosis; Statistical models; Linear models; Reproductive parameters; Reproductive traits.

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