Canopy characteristics, animal behavior and forage intake by goats grazing on Tanzania-grass pasture with different heights/Caracteristicas do dossel, comportamento animal e ingestao de forragem por caprinos em pasto de capim-tanzania em diferentes alturas

This study evaluated the influence of Tanzania-grass sward height (30, 50, 70 and 90 cm) on the morphological characteristics of the canopy, grazing behavior and forage intake by adult Anglo Nubian female goats. A completely randomized experimental design was employed, with two replicates in space a...

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Published inActa scientiarum. Animal sciences Vol. 34; no. 4; p. 371
Main Authors Ribeiro, Aline Mendes, de Oliveira, Maria Elizabete, da Silva, Patricia Carvalho, Rufino, Marcelo de Oliveira Alves, Rodrigues, Marconio Ma, dos Santos, Maurilio Souza
Format Journal Article
LanguageSpanish
Published Universidade Estadual de Maringa 01.10.2012
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Summary:This study evaluated the influence of Tanzania-grass sward height (30, 50, 70 and 90 cm) on the morphological characteristics of the canopy, grazing behavior and forage intake by adult Anglo Nubian female goats. A completely randomized experimental design was employed, with two replicates in space and two replicates in time. Six animals were used to assess the grazing behavior, and four, the ingestion process. The rise in sward height increased the forage and leaf mass, the percentages of stem and dead material, and reduced the leaf [stem.sup.-1] ratio. Above 50 cm there was an increase in grazing time and a decrease in leisure time. A positive linear correlation was detected between sward height and bite depth. The consumed forage mass, ingestion rate and daily intake were higher at 50 cm, indicating that the other heights reduced the intake process. The sward height was negatively correlated to the bite rate and positively to the bite time. The sward height of 50 cm presents the best combination of features, favoring the grazing and ingestive behavior of female adult goats. Keywords: consumption, forage production, bite rate, ingestion rate, grazing time. Objetivou-se avaliar a influencia da altura do pasto (30, 50, 70 e 90 cm) de capim-tanzania sobre caracteristicas morfologicas do dossel, comportamento em pastejo e processo de ingestao de forragem por cabras anglonubianas. Adotou-se o delineamento inteiramente casualizado, com duas repeticoes no espaco e duas repeticoes no tempo. Para a avaliacao do comportamento em pastejo foram utilizadas seis cabras e do processo de ingestao, quatro cabras. O aumento na altura do dossel resultou em aumento na massa de forragem e de folhas, da porcentagem de colmo e material morto, e reducao na razao folha [colmo.sup.-1]. Acima de 50 cm ocorreu aumento no tempo de pastejo e diminuicao no tempo de ocio. A correlacao entre altura do dossel e a profundidade de bocados foi linear positiva. A massa de forragem consumida, taxa de ingestao e consumo diario foram maiores aos 50 cm, indicando que nas demais alturas houve restricao ao processo de ingestao. A correlacao entre a altura do pasto e a taxa de bocados foi negativa e, positiva com o tempo por bocado. A altura de 50 cm apresenta melhor combinacao de caracteristicas que favorecem o comportamento em pastejo e ingestivo de cabras. Palavras-chave: consumo, producao de forragem, taxa de bocados, taxa de ingestao, tempo de pastejo.
ISSN:1806-2636
1807-8672
DOI:10.4025/actascianimsci.v34i4.14544