Forage intake and behavior of goats on Tanzania-grass pasture at two regrowth ages/Consumo de forragem e comportamento de caprinos em pasto de capim-tanzania em duas idades de rebrotacao
The forage mass, sward structure, the ingestive and grazing behavior and forage intake by goats grazing on Tanzania-grass at 22 and 37 days of regrowth were evaluated. A completely randomized experimental design was used, with eight replications for evaluating the pasture and bite depth, and six rep...
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Veröffentlicht in: | Acta scientiarum. Animal sciences 2013-01, Vol.35 (1), p.37 |
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Zusammenfassung: | The forage mass, sward structure, the ingestive and grazing behavior and forage intake by goats grazing on Tanzania-grass at 22 and 37 days of regrowth were evaluated. A completely randomized experimental design was used, with eight replications for evaluating the pasture and bite depth, and six replications for evaluating intake, feeding and grazing behavior. The forage canopy height ranged from 64.1 to 92.7 cm. Higher forage mass was observed at 37 days, and the best leaf/stem ratio, at 22 regrowth days. The bite depth did not differ between regrowth ages. The biting rate for the 22 regrowth days (23.07 bites [min..sup.-1]) was higher than at 37 days (19.06 bites [min..sup.-1]). The grazing time was longer at the regrowth age of 22 days (5.58h) than at 37 days (4.51h). The average feed intake was 2.75% of the body weight and was not different between regrowth ages. Keywords: grazing, bite depth, leaf/stem ratio, biting rate. Avaliou-se a massa de forragem e estrutura do pasto, comportamento ingestivo e de pastejo e o consumo de forragem por caprinos em pasto de capim-tanzania aos 22 e 37 dias de rebrotacao. Foi adotado o delineamento experimental inteiramente casualizado com oito repeticoes para a avaliacao do pasto e da profundidade do bocado, e com seis repeticoes para a avaliacao do consumo e do comportamento ingestivo e de pastejo. As alturas do dossel variaram de 64,1 a 92,7 cm. Maior massa de forragem foi verificada aos 37 dias e a maior relacao folha/colmo aos 22 dias de rebrotacao. A profundidade de bocado nao diferiu nas idades avaliadas. A taxa de bocado aos 22 dias (23,07 bocados [minuto.sup.-1]) foi maior que aos 37 dias (19,06 bocados [minuto.sup.-1]). Os animais despenderam maior parte do tempo em pastejo, aos 22 dias (5,58h) do que aos 37 dias (4,51h). O consumo medio de forragem foi 2,75% do peso vivo e nao diferiu entre dias de rebrotacao. Palavras-chave: pastejo, profundidade de bocado, relacao folha/colmo, taxa de bocado. |
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ISSN: | 1806-2636 |
DOI: | 10.4025/actascianimsci.v35i1.16035 |