Objetivou-se, com este trabalho, avaliar a degradabilidade “in situ†do rolão de milho e do farelo de milho em caprinos e ovinos
deslanados, mantidos em ambientes de sombra natural e artificial, no Semiárido paraibano. Foram utilizados quatro caprinos e quatro
ovinos distribuÃdos em dois ambientes, um natural e outro artificial. Foram incubados sacos de náilon, contendo amostras do rolão e farelo
de milho nos tempos de 6, 12, 24 e 48 e 72 horas para o alimento volumoso e 6, 12, 24, 48 horas para o concentrado. Os efeitos dos
ambientes e das espécies na fração b e c da MS no rolão de milho foram independentes. No ambiente artificial, a média da degradabilidade
da fração b (55,36%) foi superior à média obtida no ambiente natural (50,97%) e a fração c apresentou maior valor no ambiente natural
(40,90%) do que o artificial (36,51%). Quanto à fração b e c da MS do farelo de milho, não houve interação entre espécies e ambientes,
a degradabilidade da fração b da MS para a espécie caprina foi superior à ovina com 60,77% e 56,47%, respectivamente. Ocorrendo o
inverso para a fração c, onde os ovinos apresentaram média superior aos caprinos (31,93 e 27,63%). Houve efeito da ambiente para a DP
da MS do rolão de milho, os valores da fração b no ambiente natural e artificial foram (50,97 e 55,36%) respectivamente. A DP da MS do
farelo de milho para a espécie caprina foi maior do que para a espécie ovina (72,37 e 68,07%, respectivamente). A degradabilidade efetiva
a 5% da MS foi maior para caprinos (31,17%) do que para ovinos (28,48%). A DE da MS (calculada com taxa de passagem de 2 e 5%/
h) do farelo de milho para a espécie caprina foi superior (60,34 e 49,18%) a da ovina (56,88 e 46,51%, respectivamente). Concluiu-se que
tanto a espécie como o ambiente influenciam na degradabilidade dos alimentos. Os ovinos e caprinos apresentaram caracterÃsticas
semelhantes em relação a degradabilidade da matéria seca, proteÃna bruta e fibra em detergente neutro do rolão de milho. Todavia, para o
farelo de milho, os ovinos demonstram-se mais eficientes na degradabilidade da proteÃna bruta.
The objective of this study was to evaluate “in situ†degradability of ground cob corn and corn (maize) bran in goats and wooless sheep
kept in natural and artificial shade environments in the semi-arid region of ParaÃba. Four goats and four sheep were used, being distributed in two
environments, one natural and the other artificial. Nylon sacks were incubated containing samples of ground cob corn and corn (maize) bran in
intervals of 6, 12, 24, 48, and 72 hours for the bulk food, and 6, 12, 24, and 48 hours for the concentrate. The effects of the environments and
of the species in fractions b and c of dry matter in the cob corn were independent. In the artificial environment, the average of the degradability
of fraction b (55,36%) was higher than the average obtained in the natural environment (50,97%); and fraction c presented a higher value in the
natural environment (40,90%) than in the artificial (36,51). With respect to fractions b and c of the dry matter of the corn bran, there was no
interaction between species and environments; and the degradability of fraction b of dry matter for the goats was higher than for the sheep, with
60,77% and 56,47%, respectively. With respect to fraction c, the inverse was verified. The sheep presented a higher average than the goats
(31,93 and 27,63%). There was environmental effect for potential degradability of dry matter of the cob corn. The values of fraction b in the
natural and artificial environments were 50,97 and 55,36%, respectively. The potential degradability of corn bran for the goats was higher than
for the sheep (72,37 and 68,07%, respectively). The effective degradability to 5% of the dry matter was higher for the goats (31,17%) than for
the sheep (28,48%). The effective degradability of the dry matter (calculated with passage rate of 2 and 5%/h) of the corn bran for the goats was
superior (60,34 and 49,18%) as compared to the sheep (56,88 and 46,51%, respectively). It can be concluded that animal species and
environment have an influence on food degradability. The sheep and goats in this study presented similar characteristics with respect to the
degradability of dry matter, crude protein, and neutral detergent fiber of the cob corn. However, with respect to the corn bran, the sheep were
more efficient in degradability of crude protein, as the goats were in degradability of dry matter.
