Desenvolvimento ponderal de ovinos Santa Inês na fase de cria, manejados em pastagem e suplementados
The objective was to characterize the weight development of male and female Santa Inês lambs, from birth to weaning, managed on pasture and receiving concentrated supplementation via creep-feeding. Data from 212 sheep of the Santa Inês breed were used. During the data collection period, the anima...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/52336 |
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| Resumo: | The objective was to characterize the weight development of male and female Santa Inês
lambs, from birth to weaning, managed on pasture and receiving concentrated
supplementation via creep-feeding. Data from 212 sheep of the Santa Inês breed were
used. During the data collection period, the animals were kept on pasture of massai grass,
and all paddocks were equipped with drinkers and troughs for mineral supplementation.
The lambs received concentrated supplementation, ad libitum from the first day of life.
To evaluate the total weight gain (GPT) and average daily gain (ADG) the lambs were
weighed every 7 days. With the aid of a hypometer, the biometric measurements of the
animals were taken every 28 days. Linear, simple and multiple regression models were
tested to estimate live weight using biometric measurements as independent variables.
The non-linear Gompertz Model was used to describe weight development using weight
as repeated measures over time. There was an effect of the interaction between type of
delivery and sex (<0.05) for birth weight (BW) variables. There was an effect of the type
of delivery (<0.05) on average daily gain, total weight gain and weaning weight. The
growth curves according to the Gompertz model showed high accuracy to describe the
weight development of the category. Pearson's correlation coefficients between biometric
measurements and weight were positive and significant (P<0.05). The simple and
multiple equations showed high accuracy to predict the weight of the animals at weaning.
It is concluded that twin birth lambs receiving concentrated supplementation via creepfeeding and managed on pasture develop more slowly than single birth lambs, but when
weaned at 84 days they present compensatory gains in relation to traditional early
weaning systems. The Gompertz model can be used to predict the development of animals
and help in decision making and in the selection of precocious animals for the production
system. All linear, simple and multiple equation models are efficient to predict the weight
of animals at weaning through biometric measurements, however from a practical point
of view the equation with two measures, body length and barrel perimeter, proved to be
more efficient to be used, moreover, it is important to highlight that the more measures
are used, the greater the predictive power of the model. |
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