Fernando Lima Pires

Silagem de cana-de-açúcar em substituição a silagem de sorgo granífero para vacas leiteiras

Twelve Holstein and Schwyz lactating cows were used in a switch-back trial to evaluate the following silages corrected to a same nitrogen level by addiction of cottonseed meal, to supply the required nutrients for maintenance and production of the eight first kg of milk per cow by day, concentrate meals being used to supplement the milk produced above this level: Treatment A) grain sorghum silage; Treatment B) 50% grain sorghum silage and 50% sugar cane silage; Treatment C) sugar cane silage. Milk production per cow per day was respectively 12.9 kg, 12.3 kg and 11.8 kg and treatment A was superior to C (p<0.05). Total dry matter consumption by 100 kg of body live-weight (3.0kg, 3.0kg and 2.8kg), as the TDN consumptions (9.2kg, 8.8kg and 8.0kg) for treatments A,B and C respectively, presented no statistical differences. Twelve Ideal breed lambs were used to run an apparent digestibility trial with the same treatments applied to the lactating cows: the dry matter digestibility values were 54.4%, 56.8% and 52.0% respectively for A,B and C treatments, with no statistical differences among them.

Desempenho de bezerros recebendo silagens de sorgo ou de cana-de-açúcar como únicos alimentos volumosos

Silagens de sorgo granifero (tratamento SS) e de cana-de-acucar (tratamento SC), suplementadas com farelo de algodao para ajustar o nivel proteico das dietas a 16%, foram fornecidas a bezerros da raca Holandesa variedade malhada de preto, para avaliacao de seus desempenhos em termos de consumo de alimentos, ganhos de peso e conversoes alimentares. Os animais apresentaram media de peso de 97,7 ± 1,0 kg ao inicio do periodo de adaptacao, de 14 dias, ao qual seguiu-se periodo experimental de 70 dias. Os resultados mostraram que o tratamento com silagem de sorgo granifero foi superior ao com cana-de-acucar (p 0,05).