Further studies on the effects of the presence or absence of protozoa in the rumen on live-weight gain and wool growth of sheep

Abstract

1. Lambs were given a diet of oaten chaff-sucrose-fishmeal(48:48:4, w/w) and either 60 (diet A) or 120 (diet B) g urea/kg sucrose in the diet. All animals were defaunated and half were refaunated. Each group of lambs (faunated and defaunated) was then divided into two groups and given diet A or diet B. Feed intake, wool growth and live-weight change were monitored over a 182 d period.2. The level of urea supplementation had no effect on wool growth or live-weight gain.3. Defaunated lambs gained live weight at a higher rate (9%,P< 0.06) and grew 37% more wool (P< 0.01) than the lambs with large populations of protozoa in their rumens.