Artigo
Performance and muscle lipogenesis of calves born to Nellore cows with different residual feed intake classification
Registro en:
ROLLO DE PAZ, A. C. A. et al. Performance and muscle lipogenesis of calves born to Nellore cows with different residual feed intake classification. PLoS One, [S.l.], v. 17, n. 7, p. 1-18, July 2022. DOI: 10.1371/journal.pone.0272236.
Autor
Rollo de Paz, Ana Carolina Almeida
Ladeira, Márcio Machado
Teixeira, Priscilla Dutra
Canesin, Roberta Carrilho
Batalha, Camila Delveaux Araújo
Mercadante, Maria Eugênia Zerlotti
Bonilha, Sarah Figueiredo Martins
Institución
Resumen
This study aimed to evaluate relationships among maternal residual feed intake (RFI) with
growth performance and expression of genes involved in lipid metabolism in offspring of Nellore
cattle. Fifty-three cows classified as negative or positive RFI by genomic prediction
were exposed to fixed-time artificial insemination (FTAI) protocols at 2 and 3 years of age
using semen from the same bull. In the first year, cows gestated under grazing conditions
and nursed their calves in the feedlot. In the second year, the opposite occurred. Cows were
weighed every 28 days during pregnancy and calves were weighed at birth and every 28
days until weaning. Ultrasound images were collected from the carcass of cows and calves.
Muscle gene expression was evaluated in calves at birth and weaning. Data were analyzed
by year considering the fixed effects of RFI class and FTAI protocol for variables measured
in cows, and RFI class, FTAI protocol and sex for variables measured in calves. There was
no effect of maternal RFI on calves performance in the first year. Lower expression of
FABP4 gene and trend towards lower expression of SREBF1 and LPL genes were detected
in samples collected after birth from calves born to negative RFI cows, indicating that adipogenesis
was reduced during the fetal and neonatal period. In the second year, negative RFI
cows had greater subcutaneous fat thickness than positive RFI cows, and their calves
tended to be heavier at birth and to have less rump fat thickness at weaning. No significant
differences in expression of genes studied were detected between cow RFI classes. Nellore
cows classified as negative RFI consume less feed and produce calves whose growth
potential is similar to that of calves produced by positive RFI cows.