População protozoários ciliados e degradabilidade ruminal em búfalos e bovinos zebuínos sob dieta à base de cana-de-açúcar
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Data
2000-12-01
Autores
Franzolin, Raul
Franzolin, Maria Helena Tieghi [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Zootecnia
Resumo
Três búfalos e três bovinos zebuínos adultos com cânulas ruminais foram alimentados à vontade com dieta de cana-de-açúcar fresca e picada, suplementada com 3 kg de concentrado/animal, durante 13 semanas. Após duas semanas de adaptação, amostras do conteúdo ruminal foram coletadas semanalmente, em dois tempos de amostragem: antes da alimentação e 40 minutos após para determinação da concentração e composição da fauna ruminal. Na quinta semana do experimento, os conteúdos ruminais foram misturados e reinoculados entre animais de mesma espécie e, na última semana, estimadas as degradabilidades in situ da MS, PB e FDN da cana-de-açúcar e MS e PB do concentrado. A concentração média de protozoários foi maior em bovinos, de 4,85 x 10(5)/mL, que em búfalos, de 3,82 x 10(5)/mL. As composições genéricas para Entodinium e subfamília Diplodiniinae foram 79,2 e 6,2% em bovinos e 32,0 e 54,9% em búfalos, respectivamente. Não houve interação significativa entre espécies animais e tempo de amostragem. Houve aumento da concentração média dos holotricos após 40 minutos da alimentação. As degradabilidades efetivas dos nutrientes estudados foram semelhantes entre as duas espécies animais, observando-se diferenças na cinética da degradação. Concluiu-se que os búfalos apresentaram menor concentração de ciliados no rúmen, maior composição de Diplodiniinae e menor de Entodinium que os bovinos; os holotricos exibiram capacidade de migração e seqüestro no rúmen em ambas as espécies; e as diferenças na fauna ruminal não influenciaram a degradabilidade efetiva dos nutrientes da cana-de-açúcar e do concentrado.
Three rumen cannulated buffaloes (Bubalus bubalis) and three zebu cattle (Bos indicus) were fed chopped sugar cane ad libitum and 3 kg of concentrate/animal/day during 13 weeks. After two weeks of adaptation, samples of rumen contents were weekly collected at two times: just before feeding and 40 minutes after feeding to measure the concentration and composition of ruminal fauna. Ruminal contents were mixed and re inoculated among animals from the same species after five weeks of trial starting. During the last week, degradability of DM, CP, and NDF of sugar cane and DM and CP of the concentrate were determined by in situ technique. The average concentration of total protozoa was higher in cattle (4.85 ×10(5)/mL) than in buffaloes (3.82 × 10(5)/mL). Percent generic composition for Entodinium and subfamily Diplodiniinae was 79.2 and 6.2% in cattle and 32.0 and 54.9% in buffaloes, respectively. There was no interaction between animal species and sampling time. Holotrich concentration increased after 40 minutes of feeding. No difference was observed between buffaloes and cattle in effective degradability of the studied nutrients with differences being observed in degradation kinetic. The buffaloes had lower concentration of rumen protozoa, higher composition of Diplodiniinae and lower Entodinium than cattle. The Holotrich species exhibited capacity of migration and sequestration within the rumen of both species; and differences in ruminal fauna did not show influence on effective degradability of sugar cane and concentrate nutrients.
Three rumen cannulated buffaloes (Bubalus bubalis) and three zebu cattle (Bos indicus) were fed chopped sugar cane ad libitum and 3 kg of concentrate/animal/day during 13 weeks. After two weeks of adaptation, samples of rumen contents were weekly collected at two times: just before feeding and 40 minutes after feeding to measure the concentration and composition of ruminal fauna. Ruminal contents were mixed and re inoculated among animals from the same species after five weeks of trial starting. During the last week, degradability of DM, CP, and NDF of sugar cane and DM and CP of the concentrate were determined by in situ technique. The average concentration of total protozoa was higher in cattle (4.85 ×10(5)/mL) than in buffaloes (3.82 × 10(5)/mL). Percent generic composition for Entodinium and subfamily Diplodiniinae was 79.2 and 6.2% in cattle and 32.0 and 54.9% in buffaloes, respectively. There was no interaction between animal species and sampling time. Holotrich concentration increased after 40 minutes of feeding. No difference was observed between buffaloes and cattle in effective degradability of the studied nutrients with differences being observed in degradation kinetic. The buffaloes had lower concentration of rumen protozoa, higher composition of Diplodiniinae and lower Entodinium than cattle. The Holotrich species exhibited capacity of migration and sequestration within the rumen of both species; and differences in ruminal fauna did not show influence on effective degradability of sugar cane and concentrate nutrients.
Descrição
Palavras-chave
bovino, búfalo, cana-de-açúcar, degradabilidade, protozoários do rúmen, buffalo, degradability, rumen protozoa, sugar cane, zebu cattle
Como citar
Revista Brasileira de Zootecnia. Sociedade Brasileira de Zootecnia, v. 29, n. 6, p. 1853-1861, 2000.