Maize silage for the pasture-fed dairy cow, 1. Effect of level of silage feeding, and responses to cottonseed meal while grazing perennial pastures in the spring
1992
Moran, J.B. | Stockdale, C.R. (Victorian Dept. of Food and Agriculture, Kyabram (Australia). Kyabram Research Inst.)
Dairy cows in early lactation were fed a maize-silage-based supplement at either 3 or 8 kg DM per cow per day, while grazing irrigated perennial pastures at 45 or 30 kg pasture DM per cow per day. The supplement consisted of maize silage, alone or with 16 percent DM replaced by cottonseed meal. A fifth group grazed at the higher pasture allocation with no supplements. Supplementation increased total feed intake and milk yield of grazing cows, except at the higher level of silage without cottonseed meal. From data on N content of the grazed pasture and the supplement, together with rumen ammonia concentrations, it was concluded that low dietary protein levels limited milk yield in cows supplemented with 8 kg maize silage DM per day without the additional cottonseed meal. Liveweight and body condition score increases were greater in supplemented animals, while their rumen volatile fatty acid profiles suggested greater partitioning of nutrients towards lipogenesis in body tissue. Pasture was substituted at the rate of 0.67 kg DM for every kg maize silage DM consumed.
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