The comparative nutritive value for weaner sheep of stubble and grain of pea, vetch and lupin crops

Abstract

Weaner Merino wethers were used in three experiments to compare the nutritive value of lupin, pea and vetch grains and stubbles.

In the first experiment, grain was offered either as the sole ration at 250 g day^-1 or as a supplement of 0, 250 or 750 g day^-1 to wheat chaff which was offered ad libitum. The grains were pea, vetch, lupin, barley and a 311 mixture of barley and lupin. The mixed grain was not offered as the sole ration, nor was barley offered as a supplement at more than 250 g day^-1. There were only small differences in the nutritive value of the grains. The sheep ate less chaff when offered lupin or barley plus lupin grain than when offered pea or vetch grain. However, because the digestibility of the diets was higher with lupins, digestible organic matter intakes were similar within a level of feeding for the three legume grains. Substitution of barley for 75% of the lupins resulted in a lower intake of digestible organic matter than occurred with 100% lupins. In the second and third experiments the three legume grains were offered at 160 and 500 g day^-1 respectively, in combinations with chaff of lupin, pea or vetch stubble offered ad libitum. Some differences in the value of the chaffs were found, but the grains had similar nutritive values when offered with any particular chaff.

There were significant linear regressions between digestible organic matter intakes and liveweight gain, which were similar for the three experiments, with no differences between type of grain or type of chaff.