/img alt="Imagem da capa" class="recordcover" src="""/>
Dissertação
Suplementação de Novilhas no Período das Águas com Níveis de Proteína.
The objective of this study was to evaluate the effect of different levels of supplementary protein on the productive performance, ingestive behavior and blood parameters of heifers during the water period. Forty Nellore heifers with initial average live weight of 191 ± 16.65 kg and 13 months...
Autor principal: | Cabral, Samea Moraes |
---|---|
Grau: | Dissertação |
Idioma: | pt_BR |
Publicado em: |
Universidade Federal do Tocantins
2023
|
Assuntos: | |
Acesso em linha: |
http://hdl.handle.net/11612/6011 |
Resumo: |
---|
The objective of this study was to evaluate the effect of different levels of
supplementary protein on the productive performance, ingestive behavior and blood
parameters of heifers during the water period. Forty Nellore heifers with initial average
live weight of 191 ± 16.65 kg and 13 months of age were used and distributed in a
completely randomized design in a rotational grazing system with Magathyrsus
maximus. The treatments consisted of four protein levels in the supplement: 0% PB
(mineral), 11.4; 18.4 and 27.2 g PB/100 kg PV/day. As the level of supplementation
increased the feed protein conversion was worse (p<0.1). The feed conversion of the
supplement increase with the highest levels of crude protein in the supplement (p<0.1).
The different levels of protein did not influence (p>0.1) the final live weight, average
daily gain and total weight gain presenting average values from 257.15 kg, 0.554
kg/day and 65.85 kg, respectively. Was verified the effect of protein supplementation
on weight gain per area when evaluated by contrast, (p <0.1), in which protein levels
provided an increase in the productivity, 3.4 @/ha during the experimental period.
There was no effect (p>0.1) of the protein levels on the variables of glucose,
cholesterol, aspartate aminotransferase, alanine aminotransferase, triglycerides,
albumin, creatinine, urea and total proteins. The rumination time, leisure time, total
chewing time and chewing time were not influenced (p>0.1) by increasing protein
levels. There was effect of the protein levels (p=0.064) for the grazing time, which it
presented a linear decreasing reducing the grazing time as a function of the increased
protein levels. The time to ingest supplements was highest for the animals no protein
supplemented (p>0.1), the animals mineral supplemented presenting more chewing
number than the animals protein supplemented (p<0.01). When seeking an increase
in individual performance of heifers in pasture with good supply and nutritional value
of forage, the supplementation with low protein levels and low consumption during the
rain season is not indicated. However, is possible to increase the area productivity with
the supplementation use. Thus, to choose the appropriate supplementation strategy
should be considered the objectives to be achieved within the production system. |