Consumo alimentar residual e características de carcaça de novilhas Brangus

Content Provider	Semantic Scholar
Author	Carvalho, Lúcio Franciosi
Copyright Year	2019
Abstract	Feeding animals is the major cost in catlle herds. Cow/calf demands 65% of the total feed energy aported in catlle systems. Improve feed efficiency to produce calves and meat with lower costs has been a constant aim. Residual feed intake (RFI) has been described as an important efficiency trait to select heifers because helps to identify more efficient individuals without carrying heavier mature size. The objective of this studie was the relationship between RFI and other measures of feed efficiency and body composition and production traits. The traits were observed in a feed intake test and sequencial mesures of body composition with ultrasound equipment in 60 Brangus heifers. The feed intake test spend 70 days with previous 21 days of adaption period. The heifers were classified in low, medium and high RFI based on it`s standard deviation. Four regression equation were studied to estimate RFI, RFIegs (including EGCf in the model), RFIegsII (including EGPf in the model) and RFIegsIII (including EGCf + EGPf in the model). There were not any differences between RFI, RFIegs, RFIegsII RFIegsIII and final body composition traits. The fat measure that had the higher relationship with RFI was EGCf (0,24) and the regression equation with it`s inclusion in the model had the major R (0,25). The RFI level did not change the body composition of brangus heifers, but it`s low correlation with EGCf and the increasing R support the inclusion of this trait in the model to predict RFIegs.
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Alternate Webpage(s)	https://www.lume.ufrgs.br/bitstream/handle/10183/197756/001098746.pdf?isAllowed=y&sequence=1
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article