Abstract
Two groups of 10 Comisana rams at maintenance were fed hay and two concentrates characterized by different CP levels (20% H and 13% L). During two experimental periods, two types of hay were given: a poor-quality mixed hay from a weedy vetch and barley sward, and a good-quality sorghum hay. Dry matter intake was higher with the low-quality hay (on average: 2494.7 g per day versus 2133.1 g per day). The protein level of concentrates gave rise to different reactions in the animals in relation to the type of hay administered: with the mixed hay, no significant differences in intake were observed between the two groups (2505.0 and 2484.5 g per day, respectively, for H and L groups); with the sorghum hay, the group receiving the higher protein concentrate significantly reduced intake (2094.3 g per day versus 2171.9 g per day; P<0.05). The variations in intake caused by the two concentrates and the two hays did not result in similar variations in the ram performance.
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