UREA-MOLASSES AND COTTONSEED-MOLASSES SUPPLEMENTS FOR DAIRY GOATS
1992
J.H.G.Holmes | R.M.Dixon Animal Production Section, School of Agreculture and Forestry The University of Melbourne, Parkville 3052, Australia
Crossbred dairy does were fed a roughage diet (IVOMD 56%, N 2.27%) ad libitum, and supplemented with urea-molasses (3% W:W) (UM) at levels on air dry basis of 1.5% of 3% of liveweight or an iso-energetic, iso-nitrogenous mixture of cottonseed meal and molasses (25:75 w:w) (CM). Eight does, four lower-producers and four higher-producers (1.9 and 2.5 kg/day respectively in week 7 of lactation) arranged in two Latin Squares, received each of the four diets for three weeks. Dry matter, digestible organic matter and N intakes were higher for high-producers and high levels of supplement but did not differ between nitrogen sources. Milk production was higher by high-producers; interactions were significant between level of supplement and production group and between level of supplement and N-source, with maximum production by high producers on high levels of CM. The main effects of level of supplement were only significant for production of protein and total solids; N-soruce did not have significant effects on liveweight, milk production or composition. We conclude that does of moderate capacity for milk production, receiving a diet of two-thirds moderate quality roughage, one third urea-molasses, will not respond to increased of supplementation or to replacement of urea with cottonseed meal.
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