Milk yields of cows fed maize and molasses supplements to tropical pastures at two stocking rates

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Abstract
Twenty-four Friesian cows grazing green panic (Panicum maximum var. trichoglume)-glycine (Glycine wightii cv. Tinaroo) pastures at 2 or 4 cows ha-1 were fed no supplement, 2.4 kg maize or 3.0 kg molasses cow-1 day-1. The experiment was a randomized block design and of six months duration. Milk yield and composition were similar for cows fed maize and molasses and these supplements increased average milk yield from 10.3 to 11.8 kg cow-1 day-1 (P < 0.05). Increased stocking rate reduced milk yield from 12.7 to 9.8 kg cow-1 (P < 0.01). Interactions of stocking rate with type of supplement were not significant (P > 0.05). The level of supplement intake and yield of pasture on offer accounted for 52 per cent of the variation in average milk yields (P < 0.01). Of the variation in milk yields between paddocks only 5 per cent was unaccounted for by this relationship.