Consumo alimentar residual, digestibilidade aparente e comportamento ingestivo de touros da raça nelore
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2014-02-28
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Universidade Federal de Goiás
Resumo
Feed efficiency of cattle and its correlation with feeding behavior and apparent
digestibility of nutrients is the objective of this work. Feed efficiency is one of the
most important traits in livestock .Processes responsible for more than 25% of
feed efficiency variation have not been clarified. Explain variation sources and
identifying efficient animals are the most importantobjectives for the beef cattle
production nowadays. An alternative tool to evaluate the feed efficiency is the
residual feed intake (RFI), was developed in 1963, but only in the 90’sit started to
be used to identify and select efficient animals. Feeding behavior is directly related
to feed ingested quantity, which differs in efficient or inefficient animals . The
feeding behavior and apparent digestibility of 120 Nellore animalswere evaluated
in completely randomized design with respect to feed conversion ratio (FCR) and
the three classes of residual feed intake: low, medium and high RFI. The age and
initial body weight were 20 months and 397 ± 35 kg. The animals were placed in
individual pens fitted with feeding troughs and dri nkers. The diet offered to the
animals consisted of 23% forage and 77% concentrate. The experimental period
lasted 84 days, with weighings every 28 days. All weighings were preceded by
fasting for 16 hours. The behavior evaluation was performed in a 24 hour period.
Samples were collected from the diet offered and the leftovers at the beginning of
adaptation and weekly during the experimental period, moreover, were also
collected stool samples during three consecutive days at different times in order to
obtain a sample throughout the day.The duration time of all activities was similar
among the different groups.The variables evaluated digestibility did not differ (P >
0.05) between animals of three classes of RFI. It can be concluded that the RFI
has no correlation with feeing behavior and apparent digestibility of nutrients in the
diet.
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MENEZES, Rayanne Galdino. Consumo alimentar residual, digestibilidade aparente e comportamento ingestivo de touros da raça nelore. 2014. 40 f. Dissertação (Mestrado em Ciência Animal) - Universidade Federal de Goiás, Goiânia, 2014.