Ingestive behavior of Guzerat and Sindhi heifers under the effects of feed restriction/Comportamento ingestivo de novilhas Guzera e Sindi sob efeito de restricao alimentar
This study aimed to evaluate the effect of feed restriction on the ingestive behavior of Guzerat and Sindhi heifers. A total of 36 heifers were used, 18 from each breed, randomly distributed in a completely randomized design, in a 2 x 3 factorial scheme. The treatments used were 20 and 40% restricti...
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Published in: | Acta scientiarum. Animal sciences Vol. 34; no. 3; pp. 297 - 303 |
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Main Authors: | , , , , , |
Format: | Journal Article |
Language: | English Spanish |
Published: |
Universidade Estadual de Maringa
01-07-2012
Editora da Universidade Estadual de Maringá (Eduem) |
Subjects: | |
Online Access: | Get full text |
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Summary: | This study aimed to evaluate the effect of feed restriction on the ingestive behavior of Guzerat and Sindhi heifers. A total of 36 heifers were used, 18 from each breed, randomly distributed in a completely randomized design, in a 2 x 3 factorial scheme. The treatments used were 20 and 40% restriction compared to intake by animals from the third group, which were fed ad libitum (without restriction). For the behavioral analysis, the scan sampling method was used by logging and recording times in five-minute intervals during 24 hours, thus estimating the time spent feeding, ruminating and idling. With regard to the imposed restrictions, it was observed that non-restricted animals showed greater feeding time and lower resting time (p < 0.05); the two breeds showed the same feeding efficiency. When subjected to levels up to 40% of feed restriction, both studied genotypes perform similarly with regard to ingestive behavior, feeding efficiency and cud chews. However, there was an effect of the restriction levels on the patterns of ingestive behavior and cud chews, although there were no changes to feeding efficiency or chewing time per cud. Keywords: ethology, nutrition, zebu. Objetivou-se com este estudo avaliar o efeito da restricao alimentar sobre o comportamento ingestivo de novilhas da raca Guzera e Sindi. Foram utilizadas 36 novilhas, sendo 18 de cada uma das racas, distribuidos aleatoriamente em um delineamento inteiramente casualizado, em arranjo fatorial 2 x 3. Os tratamentos utilizados foram de 20 e 40% de restricao em relacao ao consumido pelos animais do terceiro grupo que se alimentavam a vontade (sem restricao). Para a analise comportamental utilizou-se o metodo de amostragem scan com registro temporal em intervalos de cinco minutos durante 24 horas continuas, estimando-se assim o tempo despendido em alimentacao, ruminacao e ocio. Em relacao as restricoes impostas, notou-se que animais que nao passaram por restricao alimentar apresentaram maior tempo de alimentacao e menor tempo em ocio (p < 0,05), observando-se a mesma eficiencia alimentar para novilhas das duas racas em confinamento. Os genotipos estudados quando submetidos ate um nivel de 40% de restricao alimentar se comportam de maneira igual quanto ao comportamento ingestivo, eficiencia alimentar e mastigacao mericica. Contudo houve efeito dos niveis de restricao que sao alteracoes nos padroes de comportamento ingestivo, mastigacao mericica, apesar de nao ter ocorrido alteracoes na eficiencia de alimentacao e no tempo de mastigacao por bolo. Palavras-chave: etologia, alimentacao, zebuinos. |
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ISSN: | 1806-2636 1807-8672 |
DOI: | 10.4025/actascianimsci.v34i3.14328 |