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Selection effect for growth traits on energy requirements in beef Nelore steers.

Authors :
Del Pilar Solar Diaz I
Bezerra LAF
Lôbo RB
de Araújo Neto FR
de Camargo GMF
da Cruz VAR
Costa RB
de Oliveira HN
Source :
Tropical animal health and production [Trop Anim Health Prod] 2022 Jun 15; Vol. 54 (4), pp. 213. Date of Electronic Publication: 2022 Jun 15.
Publication Year :
2022

Abstract

Growth data of 77,372 Nelore steers were used to estimate the selection effect on energy requirements considering two beef production systems: cow-calf and slaughter cycles. All the animals had measures from 120 days to 7 years old. The parameters necessary to evaluate the selection effect on energy requirements were obtained by random regression analysis using Legendre polynomials. The models included additive direct and maternal effects, and animal and maternal permanent environmental effects as random terms. Contemporary group and dam age at calving (linear and quadratic effect) were included as fixed effects, and orthogonal Legendre polynomials of animal age (cubic regression) were considered random covariables. The coefficients from the model M3353_5 were used to calculate the genetic gains necessary to predict the increase in phenotypes. The selection was simulated for body weight (BW) and weight gain (WG) at different ages and energy requirements were calculated using NRC equations. The cost of feed was calculated for a cow-calf and slaughter cycle of production considering a system of Brachiaria decumbens pasture without supplementation. In slaughter system, the selection for weight of 365 days of age is the best option. In cow-calf systems, the selection W120 is the best choice.<br /> (© 2022. This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply.)

Details

Language :
English
ISSN :
1573-7438
Volume :
54
Issue :
4
Database :
MEDLINE
Journal :
Tropical animal health and production
Publication Type :
Academic Journal
Accession number :
35704245
Full Text :
https://doi.org/10.1007/s11250-022-03210-x