Abstract

Reproductive biotechniques and crossbreeding in beef cattle are tools to increase the productive efficiency. However, it is important to evaluate the genetic and economic viability of these tools, focusing on the practice of precision livestock farming. The objective of the study was to evaluate the genetic and economic consequences of changing from a scenario characterized by the use of artificial insemination (AI-Nellore) to a scenario with using of fixed time artificial insemination (FTAI-Nellore and Angus-crossbreeding) associated to the “in vitro” fertilization (IVF-Nellore). A production system was simulated (1000 AU; one animal unit (AU) corresponding of 960 pounds of weight), with continuous grazing and variable stocking rate. The first scenario corresponded the using of the conventional AI-Nellore (40% of the progeny) and natural mating using Nellore bulls (60% of the progeny). The second scenario involved the use of IVF-Nellore (15% of progeny) and fixed time artificial insemination (Nellore and Angus) (85% of progeny – 60% Nellore and 25% Angus). Compared to natural mating, the AI and IVF resulted in an additive genetic gain of 5% and 10% for animals’ weight, respectively. For crossbreeding (FTAI), it was considered a superiority of 15% for the animals, compared to natural mating, due the heterosis gain. For the calculation of income, in both scenarios, the sale of bulls (40 at) and donors (70 at) was considered (one at = unit of weight corresponding to 32 pounds of beef). The second scenario resulted in a higher percentage of animals for commercialization as bulls and donors, but with lower profit (4.9 at.ha-1). Even with the high level of biotechnology used, the economic responses did not explain the investments made. Thus, the use of the first scenario, respecting current response rates, is the most recommended. In contrast, if the current cost of pregnancy of “in vitro” fertilization decline in 25% and the additional remuneration of top animals up to 25%, the second scenario would be more profitable (9.25%). Keywords: Angus, biotechnology, genetics, profitability, Nellore, reproduction.

Henrique José Urze Costa, Roberto Carvalheiro

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Electronic Poster Session - Genetic gain - Breeding Objectives and Economics of Selection Schemes 1, , 882, 2018
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