Níveis nutricionais na recria, gestação e pós-parto no desempenho de primíparas

José Fernando Piva Lobato; Antonio Augusto Galarza Rosa; Paulo Santana Pacheco; Haylleen Aparecida Menezes Oliveira de Sá; Ricardo Zambarda Vaz

doi:10.5433/1679-0359.2023v44n6p2113

Authors

José Fernando Piva Lobato Universidade Federal do Rio Grande do Sul https://orcid.org/0000-0002-5948-4447
Antonio Augusto Galarza Rosa universidade Federal do Rio Grande do Sul
Paulo Santana Pacheco Universidade Federal de Santa Maria https://orcid.org/0000-0003-1432-2599
Haylleen Aparecida Menezes Oliveira de Sá Universidade Federal de Santa Maria https://orcid.org/0000-0002-6141-0543
Ricardo Zambarda Vaz Universidade Federal de Pelotas https://orcid.org/0000-0003-4505-1277

DOI:

https://doi.org/10.5433/1679-0359.2023v44n6p2113

Keywords:

Stocking rate, Natural pastures, Improved natural pastures, Pregnancy rate.

Abstract

This study evaluated the reproductive performance of 36-month-old Hereford primiparous cows
(n = 119) fed different nutritional levels during rearing and pre-mating. Nutritional levels were based on two
stocking rates (SR) and the use or not of improved pastures. Heifers grazed on natural pastures during
rearing at two different SRs (0.8 and 0.6 animal units [AU] per ha). Before the first mating period, each
group was allocated either to natural or improved natural pastures at a single SR (0.7 AU ha -1 ). The better
pre-mating live performance of heifers grazing on improved pastures, independently of SR during rearing,
was not maintained during gestation, as all heifers achieved similar body weight (BW) and body condition
score (BCS) at calving. After calving, cows were allocated to natural or improved natural pastures,
independently of the previous feeding system. Except at calving, cows grazing on improved natural pastures
showed higher BW, BCS, and BW change until the end of the mating period than those grazing on natural
pastures. The higher nutritional levels supplied by improved natural pastures promoted higher pregnancy
rates (44.3%) than natural pastures (13.8%). Pregnancy rate increased according to BW range (very light,
light, medium, or heavy), with observed values of 0.0, 18.8, 21.2, and 88.0%, respectively. Cows with BCS
lower than 2.6 did not conceive, whereas a 48.1% pregnancy rate was observed in cows with 2.6-3.4 BCS
and a 100% pregnancy rate in cows with 3.5 or higher BCS. Grazing on improved natural pastures during the
post-calving period promotes higher body weight and body condition scores in primiparous cows, resulting
in higher pregnancy rates.

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Author Biographies

José Fernando Piva Lobato, Universidade Federal do Rio Grande do Sul

Prof, PhD. Department of Animal Science, Universidade Federal do Rio Grande do Sul, UFRGS, Porto Alegre, RS, Brazil.

Antonio Augusto Galarza Rosa, universidade Federal do Rio Grande do Sul

Student the Master's Course of the Postgraduate Program in in Animal Science, UFRGS, Porto Alegre, RS, Brazil.

Paulo Santana Pacheco, Universidade Federal de Santa Maria

Prof. Dr., Department of Animal Science, UFSM, Santa Maria, RS, Brazil.

Haylleen Aparecida Menezes Oliveira de Sá, Universidade Federal de Santa Maria

Student the Master's Course of the Postgraduate Program in Agribusiness, UFSM, Campus Palmeira das Missões, RS, Brazil.

Ricardo Zambarda Vaz, Universidade Federal de Pelotas

Prof. Dr., Department of zootechnics and biological sciences, UFSM, Campus Palmeira das Missões, RS, Brazil.

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