Nutritional evaluation of whole plant maize ensiled at three chop lengths and fed to lactating dairy cows
1994
Stockdale, C.R. | Beavis, G.W. (Victorian Dept. of Agriculture, Kyabram (Australia). Inst. of Sustainable Irrigated Agriculture)
Whole crop maize (Zea mays) was chopped at 3 lengths before ensiling; the maize harvested with a precision chop harvester with screen apertures of either 9 sq cm (fine chopped), 36 sq cm (medium chopped), or no screen at all (coarse chopped). The 3 silages were each fed as a supplement to pasture to lactating dairy cows in 2 experiments. Although some of the variables measured to assess silage quality suggested that the preservation process may have deteriorated as length of chop increased, length of chop of maize generally appeared to have little effect on silage quality or milk production. In experiment 1, cows ate about 7 kg DM of pasture and 8-9 kg DM of maize silage per day. Mean daily milk yields for the cows offered fine, medium and coarse chopped silage were 18.0, 17.7 and 18.2 kg per cow, respectively. In experiment 2, where daily intakes of each maize silage covered the range of 0-10.7 kg DM per cow, regression analysis could not detect any differenced in milk responses between chop lengths. It was concluded that aspects other than nutritional considerations should determine the length of chop that farmers aim for when making maize silage; these include ease of compaction in the bunker to ensure the production of good quality silage, and fuel consumption during harvesting.
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